Carrier 45VM 3 Series Service Manual
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Carrier 45VM 3 Series Service Manual

Carrier 45VM 3 Series Service Manual

Indoor units and controllers for variable refrigerant flow (vrf) heat pump system
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45VM---3 Series
Indoor Units and Controllers for
Variable Refrigerant Flow (VRF) Heat Pump System
Service Manual

Table of Contents

MAIN PCB PORTS.....................................................................4
INDOOR UNIT SETTINGS .....................................................10
CONTROL.................................................................................15
FAN CONTROL........................................................................17
ERRORS AND OPERATION CODE.......................................26
TROUBLESHOOTING.............................................................28
101
Specifications subject to change without notice.

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Summary of Contents for Carrier 45VM 3 Series

  • Page 1: Table Of Contents

    45VM---3 Series Indoor Units and Controllers for Variable Refrigerant Flow (VRF) Heat Pump System Service Manual Table of Contents MAIN PCB PORTS..............4 INDOOR UNIT SETTINGS .............10 CONTROL.................15 FAN CONTROL................17 ERRORS AND OPERATION CODE........26 TROUBLESHOOTING.............28 SATURATED GAUGE PRESSURE OF R454B REFRIGERANT Specifications subject to change without notice.

  • Page 2: Indoor Units

    Indoor Unit Model Number Nomenclature Digit # 1,2: Product Series 45 - Indoor Unit Digit # 3,4: Model Letters VM - Carrier VRF Digit # 12: Electrical 3 - 208/230-1-60 Digit # 5: Model Number Modifier C - Compact 4-Way Cassette...
  • Page 3 45VM---3: Service Manual Maintenance and Service WARNING • For safety reasons, always turn off the air conditioner and turn off the power before cleaning the air conditioner. • Do not disassemble or repair the air conditioner by yourself; otherwise, it may cause fire or other hazards. Only professional service personnel can carry out the maintenance.

  • Page 4: Main Pcb Ports

    45VM---3: Service Manual MAIN PCB PORTS Compact Four-way Cassette/Four-way Cassette/Wall Mounted 15 16 12 13 14 Fig. 2 —Compact Four-way Cassette/Four-way Cassette/Wall Mounted main PCB port Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 5 Table 1 —Compact Four-way Cassette/Four-way Cassette/Wall Mounted main PCB ports Label in Code Content Port Voltage Notes Fig. 2 CN1(L,N) AC power input 208/230V AC Standard AC power output used for customization function: CN22(ALARM,N,AC2) 208/230V AC Standard alarm/strong electric sterilization module CN12(H-L) Reserved 208/230V AC...
  • Page 6 45VM---3: Service Manual Arc Duct 1 1 1 1 1 1 4 4 Fig. 3 —Low Static Pressure Duct/Medium Static Pressure Duct main PCB ports Table 2 —Low Static Pressure Duct/Medium Static Pressure Duct main PCB ports Label in Fig. 3 Code Content Port Voltage...
  • Page 7 45VM---3: Service Manual NOTES: 1. Standard: The port is standard, the customers can connect corresponding device through this port, such as water pump and Humidity sensor etc. Customized: The port is not available on the mainboard. If necessary, you need to customize the port. Reserved: This port can not be used.
  • Page 8 45VM---3: Service Manual INDOOR UNITS Air Handler Unit Fig. 4 —AHU main PCB ports Table 3 —Air Handler Main PCB ports Label in Fig. Code Content Port Voltage Notes CN1(L1.L2) AC power input 208/230V AC Standard CN22 AC power output Used for customization function: alarm 208/230V AC Standard (ALARM,N,AC2)
  • Page 9 45VM---3: Service Manual Water level switch port 3.3V DC Standard CN190 DC Drainage pump port 12V DC Standard CN30 Display Panel connection 12V DC Standard EEV drive port 12V DC Standard CN81 T2 Temperature sensor connection 3.3V DC Standard CN83 T2B Temperature sensor connection 3.3V DC Standard...

  • Page 10: Indoor Unit Settings

    45VM---3: Service Manual INDOOR UNIT SETTINGS PARAMETER SETTINGS Table 4 — Wired Controller Parameter Settings IDU Set Item Parameter Name Parameter Range Default Value Remarks IDU static pressure is set based on the IDU static pressure 00/01-19/FF parameter value (refer to the IDU manual) High ceiling 00/01/02 00: H≤3m;...
  • Page 11 45VM---3: Service Manual IDU Set Item Parameter Name Parameter Range Default Value Remarks 04: Speed 4; 05: Speed 5; 06: Speed 6; 07: Upper automatic fan speed in cooling mode 04/05/06/07 Speed 7 04: Speed 4; 05: Speed 5; 06: Speed 6; 07: Upper automatic fan speed in heating mode 04/05/06/07 Speed 7...
  • Page 12 45VM---3: Service Manual INDOOR UNIT PRAMETER QUERY Table 5 — Indoor Unit Parameters Check List Check No. Parameters Remarks IDU and ODU communication address 0 - 63 Capacity of indoor unit Unit: HP Actual set temperature Ts Unit: C Set temperature of the unit that is operating currently, Ts (Remarks: The temperature Actual value = value displayed displayed is the actual set temperature Ts) Actual T1 indoor temperature...

  • Page 13: Functional Descriptions

    45VM---3: Service Manual FUNCTIONAL DESCRIPTIONS Power Failure Memory Function The power failure memory function can be used to ensure that, in the event of a power outage, the indoor units, which was in operation before, automatically restart once the power returns. When the power returns following a power outage, units with Power failure memory function enabled restart with the same operating mode, fan speed and remote control lock status settings as before the power outage.
  • Page 14 45VM---3: Service Manual Display Panels Appearance of Display Panel The appearance of the digital display panel used is shown in Figure 5. Display panel for Compact Four-way Cassette and Display panel for Low Static Pressure Duct\Medium Static Four-way Cassette Pressure Duct\ (Optional) (New 360 degree panel, standard panel) LED display LED display...

  • Page 15: Control

    45VM---3: Service Manual CONTROL TEMPERATURE COMPENSATION CONTROL Because of the installation position of Indoor Unit and different layout, indoor temperature detected by Indoor Unit may not consist with actual temperature. Indoor temperature could be compensated by controller (The parameter code is”N25” “N26”) EEV CONTROL When the IDU is powered on again or the ODU is stopped, the system automatically enters initialization mode.
  • Page 16 45VM---3: Service Manual Start and Stop Control Indoor Unit judges the operation state according to the temperature compensation value (ΔTC) and the difference value between detected indoor temperature (T1) and set temperature (TS). When the indoor temperature reaches the set one, Indoor Unit shut down; when the indoor temperature exceeds the set one, Indoor Unit start running. •...

  • Page 17: Fan Control

    45VM---3: Service Manual FAN CONTROL Fan speeds control The IDU can work in seven-speeds or three-speeds. • Seven-speeds When the Indoor Unit detects seven wind speeds the wind speed is set as follows. Fig. 8 —Seven-Speeds • Three-speeds When the Indoor Unit detects only three wind speeds the wind speed is set as follows. Fig.
  • Page 18 45VM---3: Service Manual • Determine the initial fan speed of auto fan control The initial fan speed is determined according to the difference between ambient indoor temperature (T1) and set temperature (TS), and it updates in the following situations: 1. The first time enter this mode 2.

  • Page 19: Swing Control

    45VM---3: Service Manual SWING CONTROL Horizontal Swing Control Table 9 — Angle Range of Horizontal Swing Heating Cooling Adjustable Range A1+A2 A1+A2 Shutdown Angle A1+B/A2+C A1+B/A2+C Fig. 13 —Horizontal Swing Angle Table 10 — Angle Range of Horizontal Swing Heating Cooling/Dehumidification Ventilation Heating...
  • Page 20 45VM---3: Service Manual Vertical Swing Control Different IDU series have different adjustable swing angle and default swing angle under different functions. And each operation mode has its default adjustable range of swing angle. P1-P5 values vary because of the different operation modes and IDU series. For details, please refer to Table 11, Table 12 and Figure 14.
  • Page 21 45VM---3: Service Manual Individual Louver Control Four-way Cassette and Compact Four-way Cassette have the individual louver control and the detail according to the following: 1. Louver selection: After entering the louver selection operation, all air flap immediately stop at the current spot and record the current spot. If there is no parameter setting within 3s, exit the louver selection state and all air flap return to the previous spot.

  • Page 22: Operation Mode Control

    45VM---3: Service Manual OPERATION MODE CONTROL Outdoor Unit is Heat Pump 1. When the mode is set by ODU to VIP priority, Voting priority, Capability requirements priority, Cooling priority, heating priority, the Indoor Unit can be set to cooling, heating, dehumidification, ventilation modes. When the IDU set mode different from the mode of ODU, the indoor unit will enters the standby mode, and the "No permission"...

  • Page 23: Anti-Freeze Control

    45VM---3: Service Manual CONTROLLING THE CONDENSATE WATER PUMP AND WATER LEVEL SWITCH 1. When the IDU is powered on the first time, the water pump is forced to operate for 5 minutes. When the IDU and ODU are in cooling, dehumidification and self-cleaning mode, the water pump starts immediately and operates continuously. After this mode is stopped (stop or mode switch), the water pump turns off five minutes later.

  • Page 24: Remote On/Off Control

    45VM---3: Service Manual HIGH CEILING SETTING For embedded IDU series, such as Compact Four-way Cassette and Four-way Cassette, when the installation exceeds the specified height (default 3 meters), can enter the High ceiling setting ( The parameter code is”N31” ) to change . 3 meters high height, 4 meters high height or 4.5 meters high height can be set.
  • Page 25 45VM---3: Service Manual Auto Dry Function Prerequisites for Function: 1. Only IDU with humidity sensor (customized) can use this function. 2. Need to enter the IDU parameter setting menu to enable this function (N66). Entry method: Cooling or Auto mode. Operation Logic: Priority cooling, when the room temperature reaches the set temperature, automatically switch to dry mode, to approximate the purpose of dual control of temperature and humidity.

  • Page 26: Errors And Operation Code

    45VM---3: Service Manual ERRORS AND OPERATION CODE Table 16 — Error Code Table Emergency stop Abnormal communication between the IDU and Wi -Fi Kit R32/R454 B refrigerant leaks, requiring shutdown Abnormal communication between the IDU main control immediately board and display board Abnormal communication between the AHU Kit slave unit Outdoor unit fault and master unit...
  • Page 27 45VM---3: Service Manual Table 17 — Error Code Table (Cont) wired controller temperature sensor failure Locked (electronic lock) The wireless temperature sensor short-circuits or cuts Unit model code not set The external room temperature sensor short-circuits or Capacity(HP) code not set cuts off Tcp (pre-cooled fresh air temperature sensor) short- The capacity value of the AHU Kit DIP switch does not match...

  • Page 28: Troubleshooting

    45VM---3: Service Manual TROUBLESHOOTING WARNING • All electrical work must be carried out by competent and suitably qualified, certified and accredited professionals and in accordance with all applicable legislation (all national, local and other laws, standards, codes, rules, regulations and other legislation that apply in a given situation).
  • Page 29 45VM---3: Service Manual A11: R32/R454B Refrigerant Leaks, Requiring Immediate Shutdown Table 20 — A11 Digital display Display position Fault Display Panel, display box, and wired controller Faulty IDU: The fan operates at the highest speed, the EXV is closed (Note: Fault persists after power on again), and the buzzer of the display control board of the faulty IDU and the buzzer of wired controller connected to the faulty IDU keep beeping.
  • Page 30 45VM---3: Service Manual Table 21 — A11 (Cont.) device, use a refrigerant pressure gauge to connect the service needle valve on the liquid side or gas side of the ODU. Measure the refrigerant saturation gauge pressure in the pipeline on site. If the measured refrigerant saturation pressure on the liquid side or gas side is less than the standard saturation pressure (see Table of Ambient Temperature - Standard Saturation Gauge Pressure of R32/R454B Refrigerant attached to this manual), there is a refrigerant leak.
  • Page 31 45VM---3: Service Manual A51 - ODU Fault Table 22 — A51 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same sys tem: The fan continues running, the EEV is closed, and code "A51"...
  • Page 32 45VM---3: Service Manual A71 - Error of Linked FAPU is Transmitted to Master IDU (Series Setting) NOTE: 1. The type of FAPU may be HRV, VRF fresh air IDU and so on. 2. Series setting: The air supply side of the linked FAPU is directly connected to the air return side of the master IDU through an air duct. A wired controller is used to set this installation method as a series connection.
  • Page 33 45VM---3: Service Manual A72 - Error of Linked Humidifying IDU is Transmitted to Master IDU Table 24 — A72 Digital display Display position (master IDU) Panel or display box Wired controller Error display Spot check interface Error code is not query displayed Master IDU: operates normally.
  • Page 34 45VM---3: Service Manual A73 - Error of Linked FAPU is Transmitted to Master IDU (Non-Series Connection) NOTE: 1. The type of FAPU may be HRV, VRF fresh air IDU and so on. 2. Series setting: The linked FAPU and the master IDU are connected to the air supply duct and air return duct respectively and separately. A wired controller is used to set this installation method as a non-series connection.
  • Page 35 45VM---3: Service Manual A74 - Error of AHU Kit Slave Unit is Sent to Master Unit NOTE: When multiple AHU Kits are connected in parallel, the master AHU Kit (referred to as the master) communicates with the ODU, and the slave AHU Kit (referred to as the slave) communicates with the master unit. When the slave fails, the slave unit sends a fault signal to the master unit, and the master unit displays ‘A74’...
  • Page 36 45VM---3: Service Manual A81 - Self-Check Fault Table 27 — A81 Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: stops. Other IDUs of the same sys tem: IDUs that share the same MS with the faulty IDU will stop operating, while other IDUs remain in operation.
  • Page 37 45VM---3: Service Manual A82 - MS (Refrigerant Flow Direction Switching Device) Fault Table 28 — A82 Digital display Display position Faulty IDU Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same sys tem: IDUs that share the same MS with the faulty IDU: The fan continues running, and the EEV is closed.
  • Page 38 45VM---3: Service Manual A91 - Mode Conflict (V6 Communication Protocol Adopted) NOTE: Available when using V6 platform wired controller. Table 29 — A91 Digital display Display position Panel, display box, and wired controller Error display (Note: Error codes are displayed 2 minutes after faults are triggered) Faulty IDU: The fan continues running, and the EEV is closed.
  • Page 39 45VM---3: Service Manual b11, b13 - Error in 1# Electronic Expansion Valve Coil, Error in 2# Electronic Expansion Valve Coil Table 30 — b11, b13l Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.
  • Page 40 45VM---3: Service Manual b11, b13 - Error in 1# Electronic Expansion Valve Coil, Error in 2# Electronic Expansion Valve Coil (Cont.) Table 31 — b11, b13 (Cont.) Note: 1. The error code corresponds to the following two situations: a. If there is only one electronic expansion valve port on the main control board of the IDU, when an error occurs in the electronic expansion valve coil connected to the EEV port, the error code is b05.
  • Page 41 45VM---3: Service Manual b12, b14 - Error in 1# Electronic Expansion Valve Body, Error in 2# Electronic Expansion Valve Body Table 32 — b12, b14 Digital display Display position Panel or display box Wired controller Error display Error code is not Spot check interface query displayed The faulty IDU and other IDUs of the same system: operate normally.
  • Page 42 45VM---3: Service Manual b34, b35 - Stall Protection for 1# Water Pump, Stall Protection on 2# Water Pump Table 33 — b34, b35 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 43 45VM---3: Service Manual b36 - Water Level Switch Alarm Error Table 34 — b36 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 44 45VM---3: Service Manual Table 35 — b36 (Cont.) Note: 1. The plug attached to the WATER port of the main control board corresponds to the following two cases: a. The factory default of IDUs without a water level switch uses a short-circuit plug to seal the WATER port. b.
  • Page 45 45VM---3: Service Manual C11 - Duplicate IDU Address Code Table 36 — C11 Digital display Display position Panel or display box Wired controller Error display Error code and address Error code and address code are displayed code flash simultaneously alternately (2) Faulty IDU: The fan continues running, and the EEV is closed.
  • Page 46 45VM---3: Service Manual Table 37 — C11 Note: 1. The following table shows the number of addresses and address codes for any indoor unit (AHU kit/direct expansion unit not applicable) with different capacities (HP) Address code to be queried at the Nominal Number of Number of...
  • Page 47 45VM---3: Service Manual Table 38 — C11 (Cont.) Example: If one IDU is 5 HP and the address code is set to 1, then the query address at the centralized controller side or wired controller side is 1. If one IDU is 20 HP and the address code is set to 5, then this IDU has four address codes, which are 5, 6, 7, and 8, but the query address at the centralized controller side or wired controller side is 5.
  • Page 48 45VM---3: Service Manual C21 - Abnormal Communication Between IDU and ODU Table 39 — C21 Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same sys tem: The fan continues running, the EEV is closed, and error code "A51"...
  • Page 49 45VM---3: Service Manual Table 40 — C21 (Cont.) If the indoor and outdoor units communicate via HyperLink (M1M2): Cause 1: M1/M2 cable short- Properly connect the circuits or cuts off (1) cable Cause 2: The repeater UP and DOWN ports are not Properly connect the connected to the cable...
  • Page 50 45VM---3: Service Manual Table 41 — C21 (Cont.) Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally. Error trigger If the main control board of an IDU has lost communication with the fan drive board for 2 min (3) Error recovery...
  • Page 51 45VM---3: Service Manual C41 - Abnormal Communication Between IDU Main Control Board and Fan Drive Board Table 42 — C41 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.
  • Page 52 45VM---3: Service Manual C51: Communication Exception Between IDU and Wired Controller NOTE: The error code C51 can be triggered either at the IDU side or the wired controller side. Table 43 — C51 LED display Display position If a powered-on IDU does not receive any message from the wired controller: 1) Wired controller: "C51"...
  • Page 53 45VM---3: Service Manual Table 44 — C51 (Cont.) Cause 1: The communication Replace the communi cation wire does not meet anti - wire that meets anti - interference requirements interference requirements Cause 2: The communication wire is bonded and connected Reconnect the sign al cable or the w ire en d metal oxidation according to the wiring...
  • Page 54 45VM---3: Service Manual C61 - Abnormal Communication Between IDU Main Control Board and Display Control Board NOTE: The error code C61 can be triggered either at the IDU side or at the panel or display box side. Table 45 — C61 Digital display Display position After power on, normal communication was not...
  • Page 55 45VM---3: Service Manual Table 46 — C61 (Cont.) Cause 1:Unplug the display box or panel communication wire from the main control board of powered indoor unit. Troubleshooting Note: 1. The control boards of display box and panel are uniformly named as display control board. 2.
  • Page 56 45VM---3: Service Manual C71 - C71 - Abnormal Communication Between AHU Kit Slave Unit and Master Unit NOTE: When multiple AHU Kits are connected in parallel, the master AHU Kit (referred to as the master) communicates with the ODU, and the slave AHU Kit (referred to as the slave) communicates with the master AHU Kit.

  • Page 57: Troubleshooting

    45VM---3: Service Manual C72 - Number of AHU Kits is not the same as the Set Number NOTE: When multiple AHU Kits are connected in parallel, the master AHU Kit (referred to as the master) communicates with the ODU, and the slave AHU Kit (referred to as the slave) communicates with the master AHU Kit. Table 48 —...
  • Page 58 45VM---3: Service Manual C73 - Abnormal Communication Between the Linked Humidifying IDU and Master IDU Table 49 — C73 Digital display Display position (master IDU) Panel or display box Wired controller Error display Spot check interface Error code is not query displayed Master IDU: operates normally.
  • Page 59 45VM---3: Service Manual C74 - Abnormal Communication Between the Linked FAPU and Master IDU (Series Setting) NOTES: 1. The type of FAPU may be HRV, VRF fresh air IDU and so on. 2. Series setting: The air supply side of the linked FAPU is directly connected to the air return side of the master IDU through an air duct. A wired controller is used to set this installation method as a series connection.
  • Page 60 45VM---3: Service Manual C75 - Communication Fault Between Linked FAPU and Master IDU (Non-Series Setting) NOTES: 1. The type of FAPU may be HRV, VRF fresh air IDU and so on. 2. Series setting: The linked FAPU and the master IDU are connected to the air supply duct and air return duct respectively and separately. A wired controller is used to set this installation method as a non-series connection.
  • Page 61 45VM---3: Service Manual C76 - Abnormal Communication Between the Main Wired Controller and Secondary Wired Controller NOTE: The error code C51 can be triggered either at the IDU side or at the wired controller side. Table 51 — C76 Digital display Display position Error display The error code "C76"...
  • Page 62 45VM---3: Service Manual C77, C78 - Abnormal Communication Between IDU Main Control Board and 1# Expansion Board, Abnormal Communication Between IDU Main Control Board and 2# Expansion Board Table 52 — C77, C78 Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed.
  • Page 63 45VM---3: Service Manual C79 - Abnormal Communication Between the IDU Main Control Board and Switch Module Table 53 — C79 Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same sys tem: operate Error impact normally.
  • Page 64 45VM---3: Service Manual C81—The Indoor Unit is in a Power-Off State Table 54 — C81 Digital display Display position Central controller or various types of control terminal Error display software The faulty indoor unit and the panels, display boxes, and wired controllers connected to it will stop running, and the central controller or various types of control terminal software will display "C81"...
  • Page 65 45VM---3: Service Manual d16 - Air Inlet Temperature of IDU is Too Low in Heating Mode Table 55 — d16 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 66 45VM---3: Service Manual d17 - Air Inlet Temperature of IDU is Too High in Cooling Mode Table 56 — d17 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 67 45VM---3: Service Manual d43 Refrigerant Leakage Sensor Service Life Reminder Table 57 — d43 Digital display Display position Fault Display Panel, display box, and wired controller The faulty IDU and other IDUs of the same sys tem operate normally. Fault Impact ODU of the same sys tem operates normally.
  • Page 68 45VM---3: Service Manual dE1 - Sensor Control Board Fault Table 58 — dE1 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 69 45VM---3: Service Manual dE2 - PM2.5 Sensor Fault Table 59 — dE2 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally. Error trigger If the main control board of an IDU has lost communication with PM2.5 sensor for 2 min Error recovery...
  • Page 70 45VM---3: Service Manual dE3 - CO2 Sensor Fault Table 60 — dE3 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally. Error trigger If the main control board of an IDU has lost communication with CO2 sensor for 2 min Error recovery...
  • Page 71 45VM---3: Service Manual dE4 - Formaldehyde Sensor Fault Table 61 — dE4 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally. Error trigger If the main control board of an IDU has lost communication with formaldehyde sensor for 2 min Error recovery...
  • Page 72 45VM---3: Service Manual dE5 - Human Detect Sensor Fault NOTE: The human detector sensor on the smart panel is used to detect the location of the human body. Table 62 — dE5 Digital display Display position Error display Panel, wired controller The faulty IDU and other IDUs of the same sys tem: operate normally.
  • Page 73 45VM---3: Service Manual E21, E24, E81 - T0 (fresh inlet air temperature sensor) short-circuits or cuts off, T1 (IDU return air temperature sensor) short-circuits or cuts off, and TA (outlet air temperature sensor) short-circuits or cuts off Table 63 — E21, E24, E81 Digital display Display position Error display...
  • Page 74 45VM---3: Service Manual E31: Wired Controller Temperature Sensor Failure Table 64 — E31 LED display Display position Panel or display box Wired controller Fault Display Panel, display box, and wired controller The faulty IDU and other IDUs of the same sys tem operate normally. Fault Impact ODU of the same sys tem operates normally.
  • Page 75 45VM---3: Service Manual EA2 - Return Air Humidity Sensor Fault Table 65 — EA2 Digital display Display position Panel or display box Wired controller Error display Spot check interface Error code is not query displayed The faulty IDU and other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 76 45VM---3: Service Manual EC1: R32/R454B Refrigerant Leakage Sensor Fault Table 66 — EC1 Digital display Display position Fault Display Panel, display box, and wired controller Faulty IDU stops. Other IDUs of the same system operate normally. Fault Impact ODU of the same system operates normally. The IDU main control board receives a sensor module fault signal from the R32/454B refrigerant Fault Trigger detection device.
  • Page 77 45VM---3: Service Manual F01, F11, F21 - T2A (heat exchanger liquid pipe temperature sensor) short-circuits or cuts off, T2 (heat exchanger middle temperature sensor) short-circuits or cuts off, and T2B (heat exchanger gas pipe temperature sensor) short- circuits or cuts off. Table 67 —...
  • Page 78 45VM---3: Service Manual P31, P34: Fan Driver Board AC Side Overcurrent Protection, at Least Six P31 Faults Detected Within 60 Minutes Table 68 — P31, P34 Digital display Display position Fault Display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem operate normally. Fault Impact ODU of the same sys tem operates normally.
  • Page 79 45VM---3: Service Manual P52 - Voltage of Power Supply is Too Low Table 69 — P52 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 80 45VM---3: Service Manual P71 - Main Control Board EEPROM Fault Table 70 — P71 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 81 45VM---3: Service Manual P72 - IDU Display Control Board EEPROM Fault Table 71 — P72 Digital display Display position Error display Panel or display box The faulty IDU operates normally, and the error code is displayed on the panel or display box only. Other Error impact IDUs of the same sys tem: operate normally.
  • Page 82 45VM---3: Service Manual U01 - Locked (electronic lock) Table 72 — U01 Digital display Display position Error display Panel, display box, and wired controller All IDUs of the same sys tem: stop running, displaying code "U01" Error impact ODU of the same sys tem: stops running, displaying code "U01" Error trigger When detecting that the ODU is locked Error recovery...
  • Page 83 45VM---3: Service Manual U11 - Unit model code not set Table 73 — U11 Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same sys tem: If the address for the faulty IDU has been set, other IDUs will operate normally.
  • Page 84 45VM---3: Service Manual U12 - Capacity (HP) code not set Table 74 — U12 Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same sys tem: If the address for the faulty IDU has been set, other IDUs will operate normally.
  • Page 85 45VM---3: Service Manual U14 - The capacity value of the AHU Kit DIP switch does not match the model Table 75 — U14 Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. Error impact 2) Other IDUs of the same sys tem: operate normally ODU of the same sys tem: operate normally...
  • Page 86 45VM---3: Service Manual U15 - The DIP value of AHU Kit's fan speed output voltage is incorrect Table 76 — U15 Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. Error impact 2) Other IDUs of the same sys tem: operate normally ODU of the same sys tem: operate normally The voltage values corresponding to the high/medium/low speed of the AHU kit do not meet the condition...
  • Page 87 45VM---3: Service Manual U26 - Mismatch between indoor unit model and outdoor unit model Table 77 — U26 Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same sys tem will operate normally Error impact ODU of the same sys tem: If there is one IDU in the sys tem is operating normally, the ODU will operate normally.
  • Page 88 45VM---3: Service Manual U38 - Address code not detected Table 78 — U38 Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same sys tem: The fan continues running, the EEV is closed, and ODU error code "A51" Error impact is displayed (V6 platform IDU displays the code "Ed").
  • Page 89 45VM---3: Service Manual J01 - Motor failed more than once Table 79 — J01 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 90 45VM---3: Service Manual J1E: IPM (fan module) overcurrent protection Table 80 — J1E LED display Display position Fault Display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. ODU of the same sys tem operates normally. Fault Impact The fault is triggered if one of the following conditions is met: 1) The current value (AC) detected for any phase line of U/V/W on the IPM exceeds the set...
  • Page 91 45VM---3: Service Manual J11: instantaneous overcurrent protection for phase current Table 81 — J11 LED display Display position Fault Display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Fault Impact ODU of the same sys tem operates normally.
  • Page 92 45VM---3: Service Manual J3E - Low bus voltage fault Table 82 — J3E Digital display Display position Panel or display box Wired controller Error display Spot check interface query Error code is not displayed The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 93 45VM---3: Service Manual J31 - High bus voltage fault Table 83 — J31 Digital display Display position Error display Panel, display box Wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally. Error trigger When the bus voltage (DC voltage) is greater than the threshold value of the driver (450V) Error recovery...
  • Page 94 45VM---3: Service Manual J43 - Phase current sample bias error Table 84 — J43 Digital display Display position Error display Panel, display box Wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 95 45VM---3: Service Manual J45 - Motor and IDU Unmatched Table 85 — J45 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 96 45VM---3: Service Manual J47 - IPM (fan module) and IDU Unmatched Table 86 — J47 Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 97 45VM---3: Service Manual J5E - Motor Startup Failure Table 87 — J5E Digital display Display position Error display Panel, display box Wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally. Error trigger Motor startup failure Error recovery...
  • Page 98 45VM---3: Service Manual J52: Motor Blocking Protection Table 88 — J52 Fault Display LED display Display position Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Fault Impact ODU of the same sys tem operates normally. Fault Trigger The motor is blocked.
  • Page 99 45VM---3: Service Manual J55 - Speed Control Mode Setting Error Table 89 — J55 Digital display Display position Error display Panel, display box Wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.
  • Page 100 45VM---3: Service Manual J6E - Phase Lack Protection of Motor Table 90 — J6E Digital display Display position Error display Panel, display box Wired controller The faulty IDU stops. Other IDUs of the same sys tem: operate normally. Error impact ODU of the same sys tem: operate normally.

  • Page 101: Saturated Gauge Pressure Of R454B Refrigerant

    45VM---3: Service Manual SATURATED GAUGE PRESSURE OF R454B REFRIGERANT Table 91 — Saturated Vapor Ambient Temperature Saturation Saturation Saturation Saturation Saturation Saturation Ambient Ambient Ambient gauge gauge gauge gauge gauge gauge temperature (°C) temperature (°C) temperature (°C) pressure (KPa) pressure (psi) pressure (KPa) pressure (psi) pressure (MPa)
  • Page 102 45VM---3: Service Manual Table 92 — Saturated Liquid Ambient Temperature Saturation Saturation Saturation Saturation Saturation Saturation Ambient Ambient Ambient gauge gauge gauge gauge gauge gauge temperature (°C) temperature (°C) temperature (°C) pressure (KPa) pressure (psi) pressure (KPa) pressure (psi) pressure (MPa) pressure (psi) 34.10 10.67...
  • Page 103 45VM---3: Service Manual Table 93 — Sensor Codes and Definitions Applicable to Tables 91 and 92 Sensor Code Definition Inlet Air Temp. Sensor Outdoor Air Temp. Sensor* Discharge Air Temp. Sensor* Liquid Pipe Temp. Sensor Middle Pipe Temp. Sensor Gas Pipe Temp. Sensor Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 104 45VM---3: Service Manual © 2025 Carrier. All rights reserved. Edition Date: 04/25 Catalog No: 45VM---3-01SM Replaces: NEW Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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