Mitsubishi FDT100VNXWVH Service Manual
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Mitsubishi FDT100VNXWVH Service Manual

Hyper inverter packaged air-conditioners
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SERVICE MANUAL
HYPER INVERTER PACKAGED AIR-CONDITIONERS
(Split system, air to air heat pump type)
CEILING CASSETTE-4 WAY TYPE
Single type
Twin type
FDT100VNXWVH
FDT100VNXWPVH
100VSXWVH
100VSXWPVH
125VNXWVH
125VNXWPVH
125VSXWVH
125VSXWPVH
140VNXWVH
140VNXWPVH
140VSXWVH
140VSXWPVH
DUCT CONNECTED-HIGH STATIC PRESSURE TYPE
Single type
FDU100VNXWVH
100VSXWVH
125VNXWVH
125VSXWVH
140VNXWVH
140VSXWVH
CEILING SUSPENDED TYPE
Single type
Twin type
FDE100VNXWVH
FDE100VNXWPVH
100VSXWVH
100VSXWPVH
125VNXWVH
125VNXWPVH
125VSXWVH
125VSXWPVH
140VNXWVH
140VNXWPVH
140VSXWVH
140VSXWPVH
V Multi System
(OUTDOOR UNIT)
(INDOOR UNIT)
FDC100VNX-W
FDT50VH
100VSX-W
60VH
125VNX-W
71VH
125VSX-W
140VNX-W
140VSX-W
Triple type
FDT140VNXWTVH
140VSXWTVH
Triple type
FDE140VNXWTVH
140VSXWTVH
FDE50VH
60VH
71VH
Manual No.'20 • PAC-SM-351
CEILING CASSETTE-4 WAY COMPACT TYPE
Twin type
Triple type
FDTC100VNXWPVH
FDTC140VNXWTVH
100VSXWPVH
125VNXWPVH
125VSXWPVH
DUCT CONNECTED-LOW/MIDDLE STATIC PRESSURE TYPE
Single type
Twin type
FDUM100VNXWVH
FDUM100VNXWPVH
100VSXWVH
125VNXWVH
125VSXWVH
140VNXWVH
140VSXWVH
WALL MOUNTED TYPE
Single type
Twin type
SRK100VNXWZR
SRK100VNXWPZSX
100VSXWZR
100VSXWPZSX
125VNXWPZSX
125VSXWPZSX
140VSXWTVH
Triple type
FDUM140VNXWTVH
100VSXWPVH
140VSXWTVH
125VNXWPVH
125VSXWPVH
140VNXWPVH
140VSXWPVH
Triple type
SRK140VNXWTZSX
140VSXWTZSX

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Summary of Contents for Mitsubishi FDT100VNXWVH

  • Page 1 HYPER INVERTER PACKAGED AIR-CONDITIONERS (Split system, air to air heat pump type) CEILING CASSETTE-4 WAY TYPE CEILING CASSETTE-4 WAY COMPACT TYPE Single type Twin type Triple type Twin type Triple type FDT100VNXWVH FDT100VNXWPVH FDT140VNXWTVH FDTC100VNXWPVH FDTC140VNXWTVH 100VSXWVH 100VSXWPVH 140VSXWTVH 100VSXWPVH...
  • Page 2 '20 • PAC-SM-351 TABLE OF CONTENTS 1. HYPER INVERTER PACKAGED AIR-CONDITIONERS ........2. V MULTI SYSTEM ....................199...
  • Page 3 '20 • PAC-SM-351 1. HYPER INVERTER PACKAGED AIR-CONDITIONERS CONTENTS 1.1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ....1.1.1 Remote control (Option parts) ............... 1.1.2 Operation control function by the wired remote control ....10 1.1.3 Operation control function by the indoor control ....... 13 (Ⅰ) FDT, FDTC, FDU, FDUM, FDE series ............
  • Page 4 '20 • PAC-SM-351 (34) Auto fan speed control (RC-EX3A only) ............ 29 (35) Indoor unit overload alarm (RC-EX3A only) ..........29 (36) Peak-cut timer (RC-EX3A only) ..............29 (37) Motion sensor control (RC-EX3A and RCN-E2 only) ........ 30 (Ⅱ) SRK Seris ....................32 (1) Unit ON/OFF button ..................
  • Page 5 '20 • PAC-SM-351 1.2.2 Troubleshooting flow ................79 (1) List of troubles ................... 79 (2) Troubleshooting ..................81 1.3 DISASSEMBLY PROCEDURE ..............172 (1) Indoor units....................172 (2) Outdoor units .....................184 1.4 ELECTRICAL WIRING ...................186 (1) Indoor units....................186 (2) Outdoor units .....................195 1.5 PIPING SYSTEM ....................197...
  • Page 6 '16 • PAC-T-251 '20 • PAC-SM-351 1.10 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1.1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1.10.1 Remote control 1.1.1 Remote control (Option parts) Wired remote control (1) Wired remote control Model RC-EX3A Model RC-EX3A ⑤ LCD (with backlight) ③...
  • Page 7 '20 • PAC-SM-351 Wired remote control Model RC-E5 Model RC-E5 The figure below shows the remote control with the cover opened. Note that all the items that may be displayed in the liquid crystal display area are shown in the figure for the sake of explanation. Characters displayed with dots in the liquid crystal display area are abbreviated.
  • Page 8 '16 • PAC-T-251 '20 • PAC-SM-351 Wireless remote control (2) Wireless remote control RCN-E2 (Except SRK series) Indication section ① OPERATION MODE display Indicates selected operation mode. SET TEMP display Indicates set temperature. SLEEP TIMER time display Indicates the amount of time remaining on the sleep timer. ②...
  • Page 9 '20 • PAC-SM-351 SRK series only Transmission section OPERATION MODE select button ON/OFF (luminous) button Each time the button is pressed, the Press to start operation, press again mode changes. to stop. TEMPERATURE button FAN SPEED button This button sets the room temperature. Each time the button is pressed, the fan speed changes.
  • Page 10 direction. AIR FLOW (LEFT/RIGHT) button 3D AUTO button This button changes the air flow (left/right) direction. This button sets 3D AUTO operation. '20 • PAC-SM-351 SILENT button NIGHT SETBACK button This buttion changes the SILENT operation. This button sets NIGHT SETBACK operation.
  • Page 11 '16 • PAC-T-251 '20 • PAC-SM-351 1.10.2 Operation control function by the wired remote control 1.1.2 Operation control function by the wired remote control ● Model RC-EX3A ●Model RC-EX3A (1) Switching sequence of the operation mode switches of remote control (1) Switching sequence of the operation mode switches of remote control (a) Tap the change operation mode button on the TOP screen.
  • Page 12 '20 • PAC-SM-351 ●Content memorized with the power failure compensation are as follows. Note(1) Items (f) and (g) are memorized regardless whether the power failure compensation is effective or not while the setting of silent mode is cancelled regardless whether the power failure compensation is effective or not. At power failure –...
  • Page 13 '20 • PAC-SM-351 ● Model RC-E5 (1) Switching sequence of the operation mode switches of remote control COOL HEAT AUTO (2) CPU reset This functions when “CHECK” and “ESP” buttons on the remote control are pressed simultaneously. Operation is same as that of the power source reset.
  • Page 14 '20 • PAC-SM-351 1.1.3 Operation control function by the indoor control (Ⅰ) FDT, FDTC, FDU, FDUM, FDE series (1) Auto operation (a) If “Auto” mode is selected by the remote control, the heating and the cooling are automatically switched according to the difference between outdoor air temperature and setting temperature and the difference between setting temperature and return air temperature.
  • Page 15 '20 • PAC-SM-351 (ii) Regardless of the setting temperature, the cooling or heating operation mode is judged according to the "Judgment based on (ii) Regardless of the setting temperature, the cooling or heating operation mode is judged according to the "Judgment Room temperature/Cooling or Heating and Outdoor temperature/Cooling or Heating".
  • Page 16 '20 • PAC-SM-351 (b) FDU, FDUM, FDE series Return air temperature sensor [Thi-A (by the remote control when the remote control temperature sensor is enabled)] controls the indoor temperature environment simultaneously. (i) Operation is started in the cooling mode. When the difference between the return air temperature and the setting temperature is 2°C or less, the indoor fan tap is brought down by one tap.
  • Page 17 '20 • PAC-SM-351 (v) Combination of patterns which can be set for the timer operations Item Sleep timer OFF timer ON timer Weekly timer Item Sleep timer Í Í OFF timer Í Í ON timer Í Weekly timer Í Í Í...
  • Page 18 '20 • PAC-SM-351 (6) Hot keep Hot keep control is performed at the start of the defrost operation. (a) Contents of operation (i) When the indoor heat exchanger temperature (detected with Thi-R1 or R2) drops to less than 35°C, the speed of indoor fan follows fan setting at the time of thermostat OFF.
  • Page 19 '20 • PAC-SM-351 (8) Thermostat operation (a) Cooling (i) Thermostat is operated with the room temperature control. (ii) Thermostat is turned ON or OFF relative to the setting room temperature as shown below. Thermostat ON Temperature drop Thermostat OFF Temperature rise Setting room temperature (iii) Thermostat is turned ON when the room temperature is in the range of -1 <...
  • Page 20 '20 • PAC-SM-351 (d) Fan control during cooling thermostat OFF (i) Following fan controls during the cooling thermostat OFF can be selected with the indoor function setting of the wired remote control. ① Low fanspeed, ② Set fan speed (Factory default), ③ Intermittence, ④ Fan OFF (ii) When the “Low fan speed”...
  • Page 21 '20 • PAC-SM-351 (11) Drain pump control (a) This control is operated when the inverter frequency is other than 0 Hz during the cooling operation and automatic cooling and dehumidifying operations. (b) Drain pump ON condition continues for 5 minutes even when it enters the OFF range according to (a) above after turning the drain pump ON, and then stops.
  • Page 22 '20 • PAC-SM-351 (c) Operation check mode There is no communication with the outdoor unit but it allows performing operation in respective modes by operating the remote control. (d) Drain pump test run mode As the drain pump test run is established, the drain pump only operates and during the operation protective functions by the microcomputer of indoor unit become ineffective.
  • Page 23 '20 • PAC-SM-351 (17) Plural unit control – Control of 16 units group by one remote control (a) Function One remote control can control a group of multiple number of unit (Max. 16 indoor units). “Operation mode” which is set by the remote control can operate or stop all units in the group one after another in the order of unit. No. Thermostat and protective function of each unit function independently.
  • Page 24 '20 • PAC-SM-351 (19) Abnormal temperature sensor (return air/indoor heat exchanger) broken wire/short-circuit detection (a) Broken wire detection When the return air temperature sensor detects -55°C or lower or the heat exchanger temperature sensor detect -55°C or lower for 5 seconds continuously, the compressor stops. After a 3-minute delay, the compressor restarts but, if it is detected again within 60 minutes after the initial detection for 6 minutes continuously, stops again (the return air temperature sensor: E7, the heat exchanger temperature sensor: E6).
  • Page 25 '20 • PAC-SM-351 (b) Input for external control The external input for the indoor unit can be selected from the following input. Input name Content 1 Run/Stop Refer to [(20) (c) Remote operation input] 2 Premission/Prohibition Refer to [(21) Operation permission/prohibition] 3 Cooling/Heating Refer to [(23) Selection of cooling/heating external input function] 4 Emergency stop...
  • Page 26 '20 • PAC-SM-351 Individual operation (Factory default) All units operation (Local setting) Only the unit Only the unit All units in one All units in one directly connected CnT-6 or directly connected remote control remote control to the remote CnTA to the remote control system can be system can be...
  • Page 27 '20 • PAC-SM-351 (a) In case of CnT ① Operation stop level > CnTA ③ Operation permission/prohibition level Operation Operation Operation Stop Stop Stop Level input Operation permission Operation permission CnTA Operation prohibition Operation permission/ prohibition setting Operation Operation( ) Operation Stop Stop...
  • Page 28 '20 • PAC-SM-351 (22) Temporary stop input In case of temporary stop, operation lamp of remote control lights, but indoor/outdoor unit stop the operation. (a) In case of “level input” setting (Factory default) Input signal to CnT-6 or CnTA is OFF → ON : Temporary stop Input signal to CnT-6 or CnTA is OFF → ON : Normal operation CnT-6 or CnTA input Actual operation Temporary stop Temporary stop Remote control...
  • Page 29 '20 • PAC-SM-351 (24) Fan control at heating startup (a) Starting conditions At the start of heating operation and after the end of hot start control, if the difference of setting temperature and return air temperature is 5°C or higher, this control is performed. (b) Contents of control (i) Sampling is made at each minute and, when the indoor heat exchanger temperature (detected with Thi-R) is 37°C or higher, present number of revolutions of indoor fan speed is increased by 10min...
  • Page 30 '20 • PAC-SM-351 (32) Fan circulator operation (RC-EX3A only) When the fan is used for circulation, the unit is operated as follows depending on the setting with the remote control. (a) If the invalid is selected with the remote control, the fan is operated continuously during the fan operation. (normal fan mode) (b) If the valid is selected with the remote control, the fan is operated or stopped when on the difference of the remote control temperature sensor and the return air temperature sensor becomes bigger than 3°C.
  • Page 31 '20 • PAC-SM-351 (37) Motion sensor control (RC-EX3A and RCN-E2 only) The sensor determines the presence of people and the amount of activity, and the following controls are done by the motion sensor. Following settings are necessary to activate motion sensor control. (a) Infrared (motion) sensor setting: Installation setting of remote control RC-EX3A The indoor unit which is set to “Enable”...
  • Page 32 '20 • PAC-SM-351 (i) Power saving / comfort control The set temperature is adjusted according to the presence of people and their amount of activity detected by the infrared (motion) sensor. MODE:AUTO/COOL/HEAT mode operation Heat Source & Activity High None Normal When the extent of human 33ºC...
  • Page 33 '20 • PAC-SM-351 '09•SRK-DB-087D (Ⅱ) SRK series (1) Unit ON/OFF button Unit ON/OFF button '09•SRK-DB-087D (a) Operation (a) Operation (b) Details of operation (b) Details of operation room (1) Unit ON/OFF button whether to go into the COOL, DRY or HEAT modes. (i) SRK-ZSX series Function Room temperature...
  • Page 34 '20 • PAC-SM-351 Auto swing control Note Even if ［ Auto Swing ］ is selected, the louver position with anti draft function is fixed to position 1. (a) RC-EX3A Louver control To operate the swing louver when the air-conditioner is operating, press the “Direction” button on the TOP screen of remote control. The wind direction select screen will be displayed. To swing the louver, touch the “Auto swing” button. The lover will move up and down. To fix the swing louver at a position, touch one of [1] - [4] buttons.
  • Page 35 '20 • PAC-SM-351 Timer operation (a) RC-EX3A (i) Sleep timer Set the time from the start to stop of operation. The time can be selected in the range from 30 to 240 minutes (in the unit of 10-minute). Note (1) Enable the “Sleep timer” setting from the remote control. If the setting is enabled, the timer operates at every time. (ii) Set OFF timer by hour Set the time to stop the unit after operation, in the range from 1 to 12 hours (in the unit of hour).
  • Page 36 '20 • PAC-SM-351 Outline of heating or cooling operation Operation of major functional components in heating mode Heating Thermostat ON Thermostat OFF Failure Compressor Indoor fan ON(HOT KEEP) Outdoor fan (few minutes ON) 4-way valve (3 minutes ON) (b) Operation of major functional components in cooling mode Cooling Thermostat ON Thermostat OFF...
  • Page 37 '20 • PAC-SM-351 Outdoor unit Signal wiring between outdoor unit Refrigerant piping and indoor units Indoor unit (Master unit) (Slave unit 1) (Slave unit 2) Connection cable Interfase kit (Master) (Slave 1) (Slave 2) * 1:In case of SRK single use. Remote control wiring * 2:In case of SRK triple use.
  • Page 38 '20 • PAC-SM-351 (b) Operation mode is changes when keep cooling and heating thermostat off 20 minutes and be satisfied following conditions. If the setting temperature is changed with the remote control, the operation mode is judged immediately. Cooling Keep operation mode SP: Setting temperature Heating...
  • Page 39 '20 • PAC-SM-351 (ii) Contents of operation Air capacity control Model SRK50, 60ZSX-W Item Upper limit of compressor's speed RangeA: 50 rps, RangeB: 50 rps, RangeC: 24 rps Indoor fan 4th speed Upper limit of compressor's speed RangeA: 50 rps, RangeB: 50 rps, RangeC: 24 rps Indoor fan Adaptable to compressor speed Twin...
  • Page 40 '20 • PAC-SM-351 (ii) Contents of operation Air capacity control Model SRK 100ZR-W Item Upper limit of compressor’s command speed Range A: As per following table, Range B: 54 rps (SRK100: 40 rps) Note (1) Ranges A and B are as shown below. ●...
  • Page 41 '20 • PAC-SM-351 1.1.4 Operation control function by the outdoor control (1) Determination of compressor speed (Frequency) Required frequency Cooling/dehumidifying operation Unit: rps Model FDC100 FDC125 FDC140 Usual operation Max. required Silent mode, outdoor air temperature ≦ 15°C frequency Silent mode II ( When SW4-1 ON ) Min.
  • Page 42 '20 • PAC-SM-351 (2) Compressor start control Compressor starts upon receipt of the thermostat ON signal from the indoor unit. (b) However, at initial start after turning the power source breaker, it may enter the standby state for maximum 30 minutes (“...
  • Page 43 '20 • PAC-SM-351 Outdoor fan control (a) Outdoor fan tap and fan motor speed Unit: min Model Mode Fan motor tap speed speed speed speed speed speed speed ① ② ③ ④ ⑤ ⑥ ⑦ FDC100-140 Cooling/Dehumidifying Heating (b) Fan tap control during cooling/defumidifying operation Fan taps are selected depending on the outdoor heat exchanger temperature (Tho-R1, R2) and the outdoor air temperature (Tho-A).
  • Page 44 '20 • PAC-SM-351 (e) Outdoor fan control by the power transistor radiator fin temperature When all the following conditions are established later than 3 minutes after the start of compressor, the following control is implemented. Cooling/dehumidifying 1) Outdoor air temperature (Tho-A) 33°C 2) Compressor’s actual frequency A rps...
  • Page 45 '20 • PAC-SM-351 Defrost operation Model FDC100-140 (a) Starting conditions If all of the following defrost conditions A or conditions B are satisfied, the defrost operation starts. Defrost conditions A Cumulative compressor operation time after the end of defrost operation has elapsed 37 minutes, and the cumulative compressor operation time after the Defrost operation start start of heating operation (remote control ON) has temperature zone...
  • Page 46 '20 • PAC-SM-351 (c) Switching of defrost control with SW3-1 If SW3-1 on the outdoor control PCB is turned to ON, it becomes easier to enter the defrost operation. Use this when installing a unit at snowing regions. (ii) Control contents It allows entering the defrost operation under the defrost condition A when the cumulative heating operation time becomes 30 minutes.
  • Page 47 '20 • PAC-SM-351 (c) Heating high pressure protection Protective control As the indoor heat exchanger temperature (Thi-R) exceeds the setting value, the compressor speed (frequency) is controlled to suppress the rise of high pressure. Control value A is updated to an optimum value automatically according to the operating conditions. Existing piping adaptation switch: SW5-1 Reduces compressor frequency Model...
  • Page 48 '20 • PAC-SM-351 Over-current protection current safe controls I, II Detecting the outdoor inverter input (primary) current and the output (secondary) current, if the current values exceed setting values, the compressor speed (frequency) is controlled to protect the inverter. Reduces frequency Cooling Heating at each minute.
  • Page 49 '20 • PAC-SM-351 ( k ) Dewing prevention control [Control condition] During cooling and dehumidifying operation, if all the following conditions are established, the compressor speed (frequency) is reduced to prevent dewing and water splash. (i) Cooling electronic expansion valve aperture (EEVC) is 500 pulses. (ii) Suction overheat is 10°C or higher.
  • Page 50 '20 • PAC-SM-351 (7) Silent mode As “Silent mode start” signal is received from the remote control, it operates by dropping the outdoor fan tap and the compressor speed (frequency). (b) For details, refer to items (1) and (4) above. (8) Test run It is possible to operate from the outdoor unit using the DIP switch on the outdoor unit control PCB.
  • Page 51 '20 • PAC-SM-351 (10) Base heater ON/OFF output control (Option) (a) Base heater ON conditions When all of following conditions are satisfied, the base heater is turned ON. ・ Outdoor air temperature (detected with Tho-A) is 3ºC or lower. ・ In the heating mode ・ When the compressor is turned ON (b) Base heater OFF conditions When either one of following conditions is satisfied, the base heater is turned OFF.
  • Page 52 '20 • PAC-SM-351 1.2 MAINTENANCE DATA 1.2.1 Diagnosing of microcomputer circuit (1) Selfdiagnosis function (a) Check indicator table Whether a failure exists or not on the indoor unit and outdoor unit can be know by the contents of remote control error code, indoor/outdoor unit green LED (power pilot lamp and microcomputer normality pilot lamp) or red LED (check pilot lamp).
  • Page 53 '20 • PAC-SM-351 Indoor unit 　　2) SRK series Remote control Indoor unit display Outdoor unit control PCB Location of Reference Description of trouble Repair method trouble page Error code Red LED RUN light TIMER light Red LED Green LED Keeps Stays OFF Stays OFF —...
  • Page 54 '20 • PAC-SM-351 (ii) Outdoor unit 　　1) FDT, FDTC, FDU, FDUM, FDE series FDC100-140VNX-W, 100-140VSX-W Outdoor Remote control Indoor unit control PCB Outdoor unit control PCB inventer Reference Location of trouble Description of trouble Repair method page Green Green Yellow Error code Red LED Red LED Red LED LED (1)
  • Page 55 '20 • PAC-SM-351 　　2) SRK series Remote control Remote control Indoor unit display Indoor unit display Outdoor unit control PCB Outdoor inventer PCB Outdoor unit control PCB Outdoor inventer PCB Reference Reference Location of trouble Location of trouble Description of trouble Description of trouble Repair method Repair method...
  • Page 56 '20 • PAC-SM-351 (iv) Display sequence of error codes or inspection indicator lamps ■ Occurrence of one kind of error Displays are shown respectively according to errors. ■ Occurrence of plural kinds of error Section Category of display Error code on remote •...
  • Page 57 '20 • PAC-SM-351 ■ Error log and reset Error indicator Memorized error log Reset Remote control display • Higher priority error is memorized. • Stop the unit by pressing the ON/OFF switch of remote control. Red LED on indoor unit control PCB •...
  • Page 58 '20 • PAC-SM-351 1) Model FDT series a) Replace the control PCB i) Unscrew terminal (Arrow A) of the "E1" wiring (yellow/green) that is connected to PCB. ii) Replace the PCB only after all the wirings connected to the connector are removed. iii) Fix the board such that it will not pinch any of the wires.
  • Page 59 '20 • PAC-SM-351 2) Model FDTC series PSC012D050 Replace and set up the PCB according to this instruction. i) Set to an appropriate address and function using switch on PCB. 　 Select the same setting with the removed PCB. Item Switch Content of control Address...
  • Page 60 '20 • PAC-SM-351 3) Models FDU, FDUM, FDE series PSB012D990 a) Control PCB PSB012D990B Replace and set up the PCB according to this instruction. i) Set to an appropriate address and function using switch on PCB. 　 Select the same setting with the removed PCB. Item Switch Content of control...
  • Page 61 '20 • PAC-SM-351 b) Power PCB This PCB is a general PCB. Replace the PCB according to this instruction. This PCB is a general PCB. Replace the PCB according to this instruction. i) Replace the PCB i)Replace the PCB ① Unscrew terminal of the wiring(yellow/green) connected to terminal block (CNWO) from the box. ②...
  • Page 62 ③ Fix the board such that it will not pinch any of the wires. ④ Reconnect the wirings to the PCB. Wiring connector color should match with the color of connector of the PCB. ⑤ Screw back the terminal of wiring, that was removed in ①. '20 •...
  • Page 63 '20 • PAC-SM-351 ●DIP switch setting list Switch Description Default setting Remark Address No. setting at plural indoor units control by 1 R/C SW5-1 Master * /Slave Master/Slave setting See table 2. SW5-2 SW6-1 SW6-2 Model selection As per model See table 1.
  • Page 64 '20 • PAC-SM-351 (a) Cautions (b) SRK series 1) If you are disassembling and checking an air conditioner, be sure to turn off the power before beginning. (i) Cautions When working on indoor units, let the unit sit for about 1 minute after turning off the power before you begin work. 1) If you are disassembling and checking an air- conditioner, be sure to turn off the power before beginning.
  • Page 65 '09•SRK-DB-087D '20 • PAC-SM-351 (iv) Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire, connector poor connection Sensor temperature characteristics (Room temperature, indoor heat exchanger temperature) - 10 Temperature (˚C) Indoor fan motor error Defective fan motor, connector poor connection, defective indoor unit PCB unit unit...
  • Page 66 '20 • PAC-SM-351 Error of signal transmission Wiring error including power cable, defective indoor/ outdoor unit PCB ② ③ unit ② ③ unit ① ② unit...
  • Page 67 '20 • PAC-SM-351 (v) Phenomenon observed after short-circuit, wire breakage on sensor Phenomenon Operation Sensor mode Short-circuit Disconnected wire Cooling Room temperature sensor Heating Freezing cycle system protection trips and stops the compressor. Cooling Heat exchanger temperature sensor Heating Cooling Humidity sensor Heating '09•SRK-DB-087D...
  • Page 68 Replace indoor unit PCB. blocks ② and ③ oscillating between DC 0 and 20V? '20 • PAC-SM-351 Indoor electrical components are normal. 2) Indoor fan motor check procedure a) Indoor unit PCB output check iii) ① ④ ⑤ DC several V (–) DC 308-336V (4-6 V)
  • Page 69 '20 • PAC-SM-351 Troubleshooting at the outdoor unit When troubleshooting the outdoor unit, firstly assess the overview of malfunction and try to presume the cause and the faulty part by checking the error code dispalyed on the remote control and flashing pattern of indicator lamps (Red LED and Green LED), and then proceed further inspection and remedy it. Self-diagnosis system by microcomputor on indoor unit and outdoor unit PCB can assist to find the cause of malfunction smoothly by making a diagnosis of not only the anomaly of microcomputer, but also the anomaly in power source system, installation space, overload resulting from improper charging amount of refrigerant and etc.
  • Page 70 '20 • PAC-SM-351 PCA012D043 Models FDC100VNX-W, 125VNX-W, 140VNX-W PCA012D043 Model FDC100VSX-W, 125VSX-W, 140VSX-W Replace the PCB after elapsing 3 minutes from power OFF. (Be sure to measure voltage (DC) on both capacitor terminals located in control back, and check that the voltage is discharged sufficiently.) Disconnect the connectors from the control PCB.
  • Page 71 '20 • PAC-SM-351 (c) Outdoor inverter PCB replacement procedure (c) Outdoor inverter PCB replacement procedure Precautions for Safety Precautions for Safety • Since the following precaution is the important contents for safety, be sure to observe them. • Since the following precaution is the important contents for safety, be sure to observe them. WARNING and CAUTION are described as follows: WARNING and CAUTION are described as follows: WARNING...
  • Page 72 '20 • PAC-SM-351 PCA012D025F (ii) Models FDC100VSX-W, 125VSX-W, 140VSX-W Replace the PCB after elapsing 3 minutes from power OFF. (Be sure to measure voltage (DC) on both capacitor terminals located in control back, and check that the voltage is discharged sufficiently.(Refer to Fig.1)) Take off the connection of inverter PCB terminal block connector and remove the screw of power transistor then remove the PCB. Wipe off the silicon grease neatly on the control’s radiation heat fins.
  • Page 73 '20 • PAC-SM-351 DIP switch setting list (Outdoor unit) Models FDC100, 125, 140VNX-W, 100, 125, 140VSX-W DIP switch setting list (Outdoor unit) (1) Control PCB Models FDC100, 125, 140VNX-W, 100, 125, 140VSX-W (1) Control PCB (1) Control PCB Description Default setting Switch Remark Pump down operation...
  • Page 74 '20 • PAC-SM-351 (5) Check of anomalous operation data with the remote control (a) In case of RC-EX3A remote control [Operating procedure] ➀ On the TOP screen, touch the buttons in the order of “Menu” ➝ “Service setting” ➝ “Service & Maintenance” ➝ “Service password”...
  • Page 75 '20 • PAC-SM-351 (b) In case of RC-E5 remote control Number Data Item Operation data can be checked with remote control unit operation. (Operation Mode) (Set Temperature) ➀ Press the button. (Return Air Temperature) The display change “ ” (Remote Control Temperature Sensor) ➁...
  • Page 76 '20 • PAC-SM-351 Power transistor module (Including the driver PCB) inspection procedure Is the power transistor module cracked or burnt? Is there a short circuit between the power transistor module ∗ terminals? Compressor operation Is there any difference in the compressor current If there is a 10% or greater difference between phases? in the current in different phases.
  • Page 77 '20 • PAC-SM-351 (7) Inverter checker for diagnosis of inverter output Models FDC100, 125, 140VNX-W,100, 125, 140VSX-W 　●Checking method (i) Setup procedure of checker. 1) Power OFF (Turn off the breaker). 2) Remove the terminal cover of compressor and disconnect the wires (U, V, W) from compressor. 3) Connect the wires U (Red) , V (White) and W (Black) of checker to the terminal of disconnected wires (U, V, W) from compressor respectively.
  • Page 78 '20 • PAC-SM-351 '20 • PAC-SM-351 Outdoor unit control failure diagnosis circuit diagram Models FDC100VNX-W, 125VNX-W, 140VNX-W t° t° t° t° t° t°...
  • Page 79 '20 • PAC-SM-351 Models FDC100VSX-W, 125VSX-W, 140VSX-W t° t° t° t° t° t°...
  • Page 80 '20 • PAC-SM-351 1.2.2 Troubleshooting flow (1) List of troubles (a) FDT, FDTC, FDU, FDUM, FDE series Remote control display Description of trouble Reference page None Operates but does not cool None Operates but does not heat None Earth leakage breaker activated None Excessive noise/vibration (1/3) None...

  • Page 81: Table Of Contents

    '20 • PAC-SM-351 (b) SRK series Remote control display Description of trouble Reference page None Operates but does not cool. None Operates but does not heat. None Earth leakage breaker activated None Excessive noise/vibration (1/3) None Excessive noise/vibration (2/3) None Excessive noise/vibration (3/3) None Louver motor failure...

  • Page 82: Operates But Does Not Cool

    '20 • PAC-SM-351 (2) Troubleshooting (a) FDT, FDTC, FDU, FDUM, FDE series Green Error code Content Keeps flashing Stays OFF Indoor None Remote control: Operates but does not cool Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Check the indoor fan operation.

  • Page 83: Operates But Does Not Heat

    '20 • PAC-SM-351 Green Content Error code Keeps flashing Stays OFF Indoor None Operates but does not heat Remote control: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Check the indoor fan operation. Check the temperature difference between return and supply air.

  • Page 84: Earth Leakage Breaker Activated

    '20 • PAC-SM-351 Green Content Error code Stays OFF Stays OFF Indoor None Earth leakage breaker activated Remote control: Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Are OK the insulation resistance and Replace compressor. resistance between terminals compressor? (1)1.044Ω...

  • Page 85: Excessive Noise/Vibration

    '20 • PAC-SM-351 Green Content Error code – – Indoor None Excessive noise/vibration (1/3) Remote control: – – Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure If excessive noise/vibration persists when sufficient Does time has elapsed after noise/vibration stopping the unit, it is occur during or soon after stopping operation considered that the air-...

  • Page 86: Excessive Noise/Vibration

    '20 • PAC-SM-351 Green Content Error code – – Indoor None Excessive noise/vibration (2/3) Remote control: – – Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure From previous page Rearrange the piping to Are the pipes avoid contact with the contacting the casing.

  • Page 87: Excessive Noise/Vibration

    '20 • PAC-SM-351 Green Content Error code – – Indoor None Excessive noise/vibration (3/3) Remote control: – – Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure From previous page If insufficient cooling/ 〔 Adjustment heating problem happens during commissioning 〕 due to anomalous operating Does noise/vibration occur when the conditions at cooling/...

  • Page 88: Louver Motor Failure

    '20 • PAC-SM-351 Green Content Error code Louver motor failure Keeps flashing Stays OFF Indoor None Remote control: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model FDT, FDTC, FDE series Diagnosis Countermeasure ▲ Check at the indoor unit side. Operate after waiting for more than 1 minute.
  • Page 89 '20 • PAC-SM-351 Green Error code Content Power source system error Indoor Stays OFF Stays OFF Remote control: None (Power source to indoor unit control PCB) Outdoor 2-time flash Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure AC220/240V detected between on the terminal block of indoor unit?

  • Page 90: Power Source System Error (Power Source To Indoor Control Pcb)

    '20 • PAC-SM-351 Green Content Error code Power source system error Keeps flashing Stays OFF Indoor None Remote control: (Power source to remote control) Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the connection of the Correct ➞...

  • Page 91: Inspect I/U (When 1 Or 2 Remote Controls Are Connected)

    '20 • PAC-SM-351 Green Content Error code INSPECT I/U Keeps flashing Stays OFF Indoor INSPECT I/U Remote control: (When 1 or 2 remote controls are connected) Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Are 2 units of remote control connected? ⑴，...

  • Page 92: Inspect I/U (Connection Of 3 Units Or More Remote Controls)

    '20 • PAC-SM-351 Green Content Error code INSPECT I/U Keeps flashing Stays OFF Indoor INSPECT I/U Remote control: (Connection of 3 units or more remote controls) Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Are more than Reduce to 2 units or less.

  • Page 93: Communication Error At Initial Operation

    '20 • PAC-SM-351 Green Content Communication error at Error code Keeps flashing Stays OFF Indoor Remote control: WAIT initial operation (1/3) Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure “ ” is still displayed on the WAIT remote control LED 2 minutes after power ON.
  • Page 94 '20 • PAC-SM-351 Green Content Communication error at Error code Keeps flashing Stays OFF Indoor Remote control: WAIT initial operation (2/3) Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Diagnosis for when the outdoor unit control PCB LED is turned off Shut down the breaker and back on again the breaker 3 minutes later.
  • Page 95 '20 • PAC-SM-351 Green Communication error at Content Error code Keeps flashing Stays OFF Indoor Remote control: initial operation (3/3) WAIT Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Method to check for inverter PCB before replacement of blown power source fuse.

  • Page 96: No Display

    '20 • PAC-SM-351 Green Content Error code No display Stays OFF Stays OFF Indoor None Remote control: Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Remote control does not display anything after the power on. Is DC10V or Defective remote control higher detected at remote control connection terminals?

  • Page 97: Remote Control Communication Circuit Error

    '20 • PAC-SM-351 Green Content Error code Remote control Keeps flashing Stays OFF Indoor Remote control: communication circuit error Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is it possible to Malfunction by noise reset normally by the Check peripheral power reset? environment.

  • Page 98: E5 Communication Error During Operation

    '20 • PAC-SM-351 Green Content Error code Keeps flashing 2-time flash Indoor Communication error during operation Remote control: Keeps flashing See below Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure ● In case that the outdoor unit red LED flashes 2-time Note (1) Inspect faulty connections (disconnection, looseness) on the outdoor unit terminal block.

  • Page 99: E6 Indoor Heat Exchanger Temperature Sensor Anomaly

    '20 • PAC-SM-351 Green Content Error code Indoor heat exchanger Keeps flashing 1-time flash Indoor Remote control: temperature sensor anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the connection of indoor heat Correct. ➞ Insert connector exchanger temperature sensor securely.
  • Page 100 '20 • PAC-SM-351 Green Content Error code Return air temperature Keeps flashing 1-time flash Indoor Remote control: sensor anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the connection of return Correct. ➞ Connect air temperature sensor connector.
  • Page 101 '20 • PAC-SM-351 Green Content Error code Keeps flashing 1-time flash Indoor Heating overload operation Remote control: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the air filter clogged? Wash. 2. Error detection method Is the indoor heat exchanger Defective indoor heat temperature sensor...
  • Page 102 '20 • PAC-SM-351 Green Content Error code Drain trouble Keeps flashing 1-time flash Indoor Remote control: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model FDT, FDTC, FDU, FDUM Diagnosis Countermeasure series Check the error data in the remote control. Is there any overflow? Is DC12V at CNI connector?

  • Page 103: E10 Excessive Number Of Connected Indoor Units (More Than 17 Units) By Controlling With One Remote Control

    '20 • PAC-SM-351 Excessive number of connected Green Content Error code indoor units (more than 17 units) Keeps flashing Stays OFF Indoor Remote control: by controlling with one remote control Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Are more than 17...
  • Page 104 '20 • PAC-SM-351 Green Content Error code Address setting error of Keeps flashing Stays OFF Indoor Remote control: indoor units Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure E11 occurs Is “Master IU address set” function of remote 2.

  • Page 105: Communication Error Between Master And Slave Indoor Units

    '20 • PAC-SM-351 Green Content Error code Communication error Keeps flashing 3-time flash Indoor Remote control: between master and slave indoor units Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is it OK the unit Correct unit address setting. address setting for master and slave indoor units?

  • Page 106: E16 Indoor Fan Motor Anomaly

    '20 • PAC-SM-351 Green Content Error code Indoor fan motor anomaly Keeps flashing 1-time flash Indoor Remote control: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Does any foreign material Remove foreign material. intervene in rotational area of fan propeller? Does the fan 2.
  • Page 107 '20 • PAC-SM-351 Green Content Error code Address setting error of Keeps flashing 1-time flash Indoor Remote control: master and slave indoor units Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure E18 occurs Is “Master IU address set”...
  • Page 108 '20 • PAC-SM-351 Green Content Error code Indoor unit operation check, Keeps flashing 1-time flash Indoor Remote control: drain pump motor check setting error Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure E19 occurs when the power ON Is SW7-1 Defective indoor unit on the indoor unit control...
  • Page 109 '20 • PAC-SM-351 Green Content Indoor fan motor rotation Error code Keeps flashing 1-time flash Indoor Remote control: speed anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Does any foreign material Remove foreign material. intervene in rotational area of fan propeller? Does the fan 2.
  • Page 110 '20 • PAC-SM-351 Green Content Error code Remote control Keeps flashing Stays OFF Indoor Remote control: temperature sensor anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the remote Correct connector. control temperature sensor connected properly? 2.
  • Page 111 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Cooling overload operation Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure * For the characteristics of outdoor heat exchanger temperature sensor, Are the refer to E37.
  • Page 112 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Discharge pipe Remote control: Outdoor control PCB Keeps flashing 1-time flash Yellow LED temperature error Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure * For the characteristics of discharge Are the pipe temperature sensor, refer to E39.
  • Page 113 '20 • PAC-SM-351 Green Outdoor heat Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: exchanger temperature Outdoor control PCB Keeps flashing 1-time flash Yellow LED sensor anomaly Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the...

  • Page 114: Outdoor Air Temperature Sensor Anomaly

    '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Outdoor air temperature Remote control: Outdoor control PCB Keeps flashing 1-time flash Yellow LED sensor anomaly Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure the outdoor air Correct connector.

  • Page 115: Discharge Pipe Temperature Sensor Anomaly

    '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Discharge pipe temperature Outdoor control PCB Keeps flashing 1-time flash Yellow LED sensor anomaly Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the discharge pipe...
  • Page 116 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF High pressure error Remote control: Outdoor control PCB Keeps flashing 1-time flash (63H1 activated) Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure If the power source breaker is turned OFF and ON too quickly, E40 may be displayed.

  • Page 117: E48 Outdoor Fan Motor Anomaly

    '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Power transistor overheat Yellow LED Outdoor inverter 6-time flash 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Single phase models (FDC71-140VNX-W) •...
  • Page 118 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Current cut (1/2) Yellow LED Outdoor inverter 1-time flash 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the power source Check power source.
  • Page 119 '20 • PAC-SM-351 Green Error code Content Indoor Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Current cut (2/2) Yellow LED Outdoor inverter 1-time flash 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure From previous page Is the checked result of power Defective inverter (or...
  • Page 120 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Communication error between Remote control: Outdoor control PCB Keeps flashing 1-time flash inverter PCB and outdoor unit control PCB Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1.
  • Page 121 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Outdoor fan motor anomaly Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Does any foreign Remove foreign material.
  • Page 122 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Low pressure error or Remote control: Outdoor control PCB Keeps flashing 1-time flash low pressure sensor anomaly (1/2) Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1.
  • Page 123 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Low pressure error or Remote control: Outdoor control PCB Keeps flashing 1-time flash low pressure sensor anomaly (2/2) Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1.
  • Page 124 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Inverter and fan motor anomaly Yellow LED Outdoor inverter 6-time flash 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Models FDC100-140VNX-W •...
  • Page 125 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Suction pipe Remote control: Outdoor control PCB Keeps flashing 1-time flash temperature sensor anomaly Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the connection of suction pipe temperature sensor...
  • Page 126 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Low pressure sensor anomaly Outdoor control PCB Keeps flashing 1-time flash Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Are the connection of low pressure Correct low pressure sensor...
  • Page 127 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Insufficient refrigerant amount Outdoor control PCB Keeps flashing 1-time flash or detection of service valve closure Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1.
  • Page 128 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 5-time flash Compressor startup failure (1/2) Yellow LED Outdoor inverter Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure In case that the compressor...
  • Page 129 '20 • PAC-SM-351 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 5-time flash Compressor startup failure (2/2) Yellow LED Outdoor inverter Stays OFF 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure From previous page Is the (Inverter PCB anomaly)
  • Page 130 '20 • PAC-SM-351 (b) SRK series RUN light TIMER light Indoor Content Error code display – – Operates but does not cool None Remote control: Green LED Red LED Outdoor unit control PCB Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...
  • Page 131 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – Operates but does not heat None Remote control: Green LED Red LED Outdoor unit control PCB Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor unit fan operation.
  • Page 132 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – Earth leakage breaker activated None Remote control: Green LED Red LED Outdoor unit control PCB Stays OFF Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are OK the...
  • Page 133 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – Excessive noise/vibration (1/3) None Remote control: Green LED Red LED Outdoor unit control PCB – – 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure If excessive noise/vibration persists when sufficient Does time has elapsed after...
  • Page 134 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – Excessive noise/vibration (2/3) None Remote control: Green LED Red LED Outdoor unit control PCB – – 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure From previous page Rearrange the piping to Are the pipes...
  • Page 135 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – Excessive noise/vibration (3/3) None Remote control: Green LED Red LED Outdoor unit control PCB – – 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure From previous page If insufficient cooling/ 〔...
  • Page 136 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – Louver motor failure None Remote control: Green LED Red LED Outdoor unit control PCB Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure L Check at the indoor unit side.
  • Page 137 '20 • PAC-SM-351 RUN light TIMER light Indoor Power source system error Content Error code display – – None Remote control: (Power source to indoor unit control PCB) Green LED Red LED Outdoor unit control PCB Stays OFF 2-time flash 5.
  • Page 138 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code Power source system error display – – None (Power source to remote control) Remote control: Green LED Red LED Outdoor unit control PCB Keeps flashing Stays OFF 5. Troubleshooting 1.
  • Page 139 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display Stays OFF Keeps flashing Limit switch anomaly None Remote control: Green LED Red LED Outdoor unit control PCB Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the inlet...
  • Page 140 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – INSPECT I/U INSPECT I/U Remote control: Green LED Red LED Outdoor unit (When 1 or 2 remote controls are connected) control PCB Keeps flashing 2-time flash 5.
  • Page 141 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – INSPECT I/U INSPECT I/U Remote control: Green LED Red LED Outdoor unit (Connection of 3 units or more remote control) control PCB Keeps flashing 2-time flash 5.
  • Page 142 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – Communication error at Remote control: WAIT Green LED Red LED Outdoor unit initial operation (1/3) control PCB Keeps flashing 2-time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...
  • Page 143 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – Communication error at Remote control: WAIT Green LED Red LED Outdoor unit initial operation (2/3) control PCB Keeps flashing 2-time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...
  • Page 144 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – Communication error at Remote control: WAIT Green LED Red LED Outdoor unit initial operation (3/3) control PCB Keeps flashing 2-time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...
  • Page 145 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – No display None Remote control: Green LED Red LED Outdoor unit control PCB Stays OFF Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Remote control does not display anything after the power on.
  • Page 146 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display – – Remote control Remote control: Green LED Red LED Outdoor unit communication circuit error control PCB Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is it possible to...
  • Page 147 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display 6-time flash Communication error during operation Remote control: Green LED Red LED Outdoor unit control PCB Keeps flashing See below 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure In case that the outdoor unit red LED flashes 2-time Note (1) Inspect faulty connections (disconnection,...
  • Page 148 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code Indoor heat exchanger display 1(3)-time flash Remote control: Green LED Red LED temperature sensor anomaly Outdoor unit control PCB Keeps flashing Stays OFF Note(1) Value in ( ) are the Th2 5.
  • Page 149 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code Room temperature display 2-time flash None Remote control: Green LED Red LED sensor anomaly Outdoor unit control PCB Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the...
  • Page 150 '20 • PAC-SM-351 RUN light TIMER light Excessive number of connected Indoor Content Error code display – – indoor units (more than 17 units) Remote control: Green LED Red LED Outdoor unit by controlling with one remote control control PCB Keeps flashing Stays OFF 5.
  • Page 151 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code Communication error display – – Remote control: Green LED Red LED between master and slave indoor units Outdoor unit control PCB Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...
  • Page 152 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code display 6-time flash Remote control: Indoor fan motor anomaly Green LED Red LED Outdoor unit control PCB Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Does any foreign material...
  • Page 153 '20 • PAC-SM-351 RUN light TIMER light Indoor Content Error code Remote control display – – Remote control: temperature sensor anomaly Green LED Red LED Outdoor unit control PCB Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure 2.
  • Page 154 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content Keeps flashing Remote control: Green LED Red LED Outdoor unit Cooling overload operation Keeps flashing 1-time flash control PCB Yellow LED Outdoor unit Keeps flashing inverter PCB 5. Troubleshooting 1.
  • Page 155 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content 5-time flash Remote control: Discharge pipe Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB temperature error Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 156 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content Keeps flashing 2-time flash Remote control: Outdoor heat exchanger Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB temperature sensor anomaly Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 157 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content Keeps flashing 1-time flash Remote control: Outdoor air temperature Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB sensor anomaly Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 158 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content Keeps flashing 4-time flash Remote control: Discharge pipe Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB temperature sensor anomaly Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 159 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content – – Remote control: High pressure error Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB (63H1 activated) Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 160 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content – – Remote control: Green LED Red LED Outdoor unit 　　 Power transistor overheat Keeps flashing 1-time flash control PCB Yellow LED Outdoor unit 6-time flash inverter PCB 5.
  • Page 161 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content 1-time flash Remote control: Green LED Red LED Outdoor unit Current cut (1/2) Keeps flashing 1-time flash control PCB Yellow LED Outdoor unit 1-time flash inverter PCB 5. Troubleshooting 1.
  • Page 162 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content 1-time flash Remote control: Green LED Red LED Outdoor unit Current cut (2/2) Keeps flashing 1-time flash control PCB Yellow LED Outdoor unit 1-time flash inverter PCB 5. Troubleshooting 1.
  • Page 163 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content – – Remote control: Communication error between Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB inverter PCB and outdoor unit control PCB Yellow LED Outdoor unit Keeps flashing inverter PCB...
  • Page 164 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content 7-time flash Remote control: Outdoor fan motor anomaly Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 165 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content – – Remote control: Low pressure error or Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB low pressure sensor anomaly (1/2) Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 166 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content – – Remote control: Low pressure error or Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB low pressure sensor anomaly (2/2) Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 167 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content 4-time flash Remote control: Green LED Red LED Outdoor unit Inverter and fan motor anomaly Keeps flashing 1-time flash control PCB Yellow LED Outdoor unit 6-time flash inverter PCB 5.
  • Page 168 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content Keeps flashing 5-time flash Remote control: Suction pipe temperature Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB sensor anomaly Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 169 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content – – Remote control: Green LED Red LED Outdoor unit Low pressure sensor anomaly Keeps flashing 1-time flash control PCB Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 170 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content 7-time flash Remote control: Insufficient refrigerant amount Green LED Red LED Outdoor unit Keeps flashing 1-time flash control PCB or detection of service valve closure Yellow LED Outdoor unit Keeps flashing inverter PCB 5.
  • Page 171 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content – – Remote control: Green LED Red LED Outdoor unit Compressor startup failure (1/2) Keeps flashing 5-time flash control PCB Yellow LED Outdoor unit Stays OFF inverter PCB 5.
  • Page 172 '20 • PAC-SM-351 RUN light TIMER light Error code Indoor display Content – – Remote control: Green LED Red LED Outdoor unit Compressor startup failure (2/2) Keeps flashing 5-time flash control PCB Yellow LED Outdoor unit Stays OFF inverter PCB 5.
  • Page 173 '20 • PAC-SM-351 PJF012D045 PJF012D045 DISASSEMBLY PROCEDURE 1.3 DISASSEMBLY PROCEDURE DISASSEMBLY PROCEDURE Precaut ions for safety Precaut ions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off...
  • Page 174 '20 • PAC-SM-351 PJF012D045 PROCEDURE & PICTURES Pipe lid To remove the heat exchanger assembly (1) Remove the drain pan.(See No.4) (2) Remove 2 pipe lid fixing screws and remove it.( mark) (3) Remove 3 heat exchanger assembly fixing screws and remove it.( mark) Coil of EEV 8.
  • Page 175 The electrical components are under high voltage by the opera on of the booster capacitor. ● Fully discharge the capacitor before commencing a repair work. Failure to observe this warning could result in electric shock. When parts of refrigerant cycle is disassembled by welding, be sure to work a er collec ng a refrigerant, if the refrigerant isn't ●...
  • Page 176 '20 • PAC-SM-351 PJA012D792A PROCEDURE & PICTURES 6. To remove the temperature sensors (example"Thi-R1") (1) Remove the lid of control box.(See No.1) (2) Disconnect the temperature sensor connector(CNNx). (3) Remove the drain pan.(See No.3) (4) Pull out the temperature sensor "Thi-R1"...
  • Page 177 When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor. Fully discharge the capacitor before commencing a repair work. Failure to observe this warning could result in electric shock. When parts of refrigerant cycle is disassembled by welding, be sure to work after collecting a refrigerant, if the refrigerant isn't '20 •...
  • Page 178 PJG012D019 '20 • PAC-SM-351 PROCEDURE & PICTURES 7. To remove the drain pump(DM) and flot switch(FS) (1) Remove the lid of control box.(See No.1) (2) Remove 5 drain pump assembly fixing screws and remove it. mark) (3) Disconnect the drain pump connector(CNR) on PCB in control box. (4) Pull a hose to the arrow direction and remove it.
  • Page 179 When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor. Fully discharge the capacitor before commencing a repair work. Failure to observe this warning could result in electric shock. When parts of refrigerant cycle is disassembled by welding, be sure to work after collecting a refrigerant, if the refrigerant isn't '20 •...
  • Page 180 '20 • PAC-SM-351 PFA012D631 PROCEDURE & PICTURES Bottom panel 6. To remove side panel and bottom panel (1) Remove air inlet grille.(See No.1) (2) Remove the right and left side panel fixing screws and remove it.( mark) (3) Remove 5 bottom panel fixing screws.( mark) Remove 6 bottom panel fixing screws and remove it.
  • Page 181 '20 • PAC-SM-351 (e) SRK series PHA012D402...
  • Page 182 '20 • PAC-SM-351 Screw...
  • Page 183 '20 • PAC-SM-351 PHA012D402...
  • Page 184 '20 • PAC-SM-351 PHA012D402...
  • Page 185 '20 • PAC-SM-351 (2) Outdoor units PCA012D087 1. To remove the service panel (1) Remove 5 service panel fixing screws and remove it. 2. To remove the fan motor (FM) (1) Remove the service panel.(See No.1) (2) Disconnect the motor connector(FMxx) on PCB in control box. (3) Remove 4 fan guard ews and remove it.( mark)
  • Page 186 '20 • PAC-SM-351 9. To remove the compressor (CM) (1) Remove the service panel.(See No.1) (2) Remove the insula which covers compressors. (Strings (a) (d) should be loosen.) (3) Remove 3 terminal cover fixing bolts( mark) and remove it and disconnect the power wiring. (4) Remove welded part of compressor by welding.
  • Page 187 '20 • PAC-SM-351 1.4 ELECTRICAL WIRING (1) Indoor units (a) Ceiling cassette-4 way type (FDT) Models FDT50VH, 60VH, 71VH, 100VH, 125VH, 140VH PJF000Z554...
  • Page 188 '20 • PAC-SM-351 (b) Ceiling casette-4 way compact type (FDTC) Models FDTC50VH, 60VH PJF000Z516...
  • Page 189 '20 • PAC-SM-351 (c) Duct connected-High static pressure type (FDU) Models FDU100VH, 125VH, 140VH PJG000Z580...
  • Page 190 '20 • PAC-SM-351 (d) Duct connected-Low / Middle static pressure type (FDUM) Model FDUM50VH PJG000Z488...
  • Page 191 '20 • PAC-SM-351 Models FDUM60VH, 71VH PJG000Z489...
  • Page 192 '20 • PAC-SM-351 Models FDUM100VH, 125VH, 140VH PJG000Z490...
  • Page 193 '20 • PAC-SM-351 (e) Ceiling suspended type (FDE) Models FDE50VH, 60VH, 71VH, 100VH, 125VH, 140VH PFA004Z087...
  • Page 194 '20 • PAC-SM-351 (f) Wall mounted type (SRK) Models SRK50ZSX-W, 60ZSX-W RWA000Z413...
  • Page 195 '20 • PAC-SM-351 Model SRK100ZR-W RWA000Z417...
  • Page 196 '20 • PAC-SM-351 (2) Outdoor units Models FDC100VNX-W, 125VNX-W, 140VNX-W PCA001Z886...
  • Page 197 '20 • PAC-SM-351 Models FDC100VSX-W, 125VSX-W, 140VSX-W PCA001Z887...
  • Page 198 (Flare connecting) (EEV) Capillary tube Liquid line Strainer Muffler '20 • PAC-SM-351 1.5 PIPING SYSTEM (1) Single type Models FDT71, 100, 125, 140 Models 100, 125, 140 Indoor unit Outdoor unit Cooling cycle Heating cycle Check joint 4-way valve Temperature sensor Gas line (Tho-A) Muffler...
  • Page 199 '20 • PAC-SM-351 (3) Triple type (3) Triple type Model FDT140 Model 140 Gas branch pipe Outdoor unit (φ12.7) Cooling cycle Heating cycle Indoor unit Indoor unit Indoor unit Check joint Temperature sensor (Tho-A) Gas line Muffler (φ15.88) Flare connecting Service valve (Flare connecting) Temperature sensor...
  • Page 200 '20 • PAC-SM-351 2. V MULTI SYSTEM CONTENTS 2.1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ......200 2.2 MAINTENANCE DATA ...................200 2.3 DISASSEMBLY PROCEDURE ................200 2.4 ELECTRICAL WIRING ...................200 2.5 PIPING SYSTEM ....................200...
  • Page 201 '20 • PAC-SM-351 2.1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER .... See page 2.2 MAINTENANCE DATA ................See page 51 2.3 DISASSEMBLY PROCEDURE ..............See page 172 2.4 ELECTRICAL WIRING ................See page 186 2.5 PIPING SYSTEM ..................See page 197...
  • Page 202 Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. Copyright MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. © Copyright MITSUBISHI HEAVY INDUSTRIES, LTD.

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