DURASTAR DRA1U09S1A Service Manual
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DURASTAR DRA1U09S1A Service Manual

Single zone wall mounted mini split
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SINGLE ZONE WALL MOUNTED MINI SPLIT
OUTDOOR UNITS: DRA1U09S1A, DRA1U12S1A, DRA1U18S1A, & DRA1U24S1A
INDOOR UNITS: DRAW09F1A, DRAW12F1A, DRAW18F1A, & DRAW24F1A
SERVICE MANUAL

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Questions and answers

Jim
April 10, 2025

I have a communication error code from the indoor unit to the outdoor unit, possible causes?

0
1 comments:
Mr. Anderson
April 10, 2025

Possible causes of a communication error code (E1) between the indoor and outdoor units of a DURASTAR DRA1U09S1A include:

- Faulty indoor PCB
- Faulty outdoor PCB
- Faulty reactor
- Abnormal voltage between terminals S and N of the outdoor unit
- Faulty indoor wiring connections
- Faulty outdoor wiring connections

This answer is automatically generated

0
Brian Lee Haag
March 14, 2025

I have two horizontal bars on led what does that mean

0
1 comments:
Mr. Anderson
May 14, 2025

If there are two horizontal bars on the LED of a DURASTAR DRA1U09S1A, it indicates that an error code is being displayed. You should wait about 10 minutes to see if the issue resolves on its own. If not, disconnect and reconnect the power, then turn the unit on again. If the problem continues, disconnect the power and contact customer service.

This answer is automatically generated

0

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Summary of Contents for DURASTAR DRA1U09S1A

  • Page 1 SINGLE ZONE WALL MOUNTED MINI SPLIT OUTDOOR UNITS: DRA1U09S1A, DRA1U12S1A, DRA1U18S1A, & DRA1U24S1A INDOOR UNITS: DRAW09F1A, DRAW12F1A, DRAW18F1A, & DRAW24F1A SERVICE MANUAL...

  • Page 2: Table Of Contents

    Table of Contents Page 1. Safety Precautions ..................In case of Accidents or Emergency Pre-Installation and Installation Operation and Maintenance 2. Speci cations ....................Model Reference (with unit refrigerant pipe sizes) Electrical Wiring Diagrams 3. Product Features ................... Operation Modes and Functions 4.

  • Page 3: Safety Precautions

    Safety Precautions Contents In Case of Accidents or Emergency ..............Pre-Installation ....................... Operation and Maintenance .................

  • Page 4: Pre-Installation And Installation

    To prevent personal injury, or property or unit damage, CAUTION adhere to all precautionary measures and instructions While unpacking be careful of sharp edges around outlined in this manual. Before servicing a unit, refer to this the unit as well as the edges of the ns on the con - service manual and its relevant sections.

  • Page 5: Speci Cations

    Speci cations Contents Model Reference (with unit refrigerant pipe sizes) .......... Electrical Wiring Diagrams ..................Indoor Unit ....................Outdoor Unit ....................

  • Page 6: Model Reference (With Unit Refrigerant Pipe Sizes)

    1. Model Reference Refer to the following table to determine the specific indoor and outdoor unit model number of your purchased equipment. Indoor Unit Model Outdoor Unit Model Capacity (Btu/h) Power Supply DRAW09F1A DRA1U09S1A DRAW12F1A DRA1U12S1A 208/230V~, 60Hz, 1Phase DRAW18F1A DRA1U18S1A DRA1U24S1A...

  • Page 7: Electrical Wiring Diagrams

    2. Electrical Wiring Diagrams Indoor unit Abbreviation Paraphrase Yellow-Green Conductor Positive and Negative Ion Generator Capacitor PLASMA Electronic Dust Collector LIVE NEUTRAL Heater The Electric Heating Belt of Indoor Unit Indoor Room Temperature Coil Temperature of Indoor Heat Exchanger Middle Page 5...
  • Page 8 DRAW09F1A, DRAW12F1A, DRAW18F1A, DRAW24F1A 16022000019694 O PTI O N AL Y/ G I O N CN12_1 CN12_2 H EATER CN6_1 CN6_2 OPTIONAL INDOOR WIRING DIAGRAM OPTIONAL Page 6...

  • Page 9: Outdoor Unit

    Outdoor Unit Abbreviation Paraphrase 4-WAY Gas Valve Assembly/4-WAY VALVE AC-FAN Alternating Current FAN DC-FAN Direct Current FAN AC Current Detector COMP Compressor L-PRO Low Pressure Switch H-PRO High Pressure Switch Coil Temperature of Condenser Outdoor Ambient Temperature Compressor Suction Temperature Compressor Discharge Temperature Electronic Expansion Valve Page 7...
  • Page 10 DRA1U09S1A, DRA1U12S1A BLUE OR BLACK BROWN I N D O O R U N I T 4-WAY CRANKCASE HEATER HEATER BLUE BLACK CN 7 OPTIONAL: DC-FAN Page 8...
  • Page 11 DRA1U18S1A, DRA1U24S1A Applicable to Applicable to the units adopting the units adopting DC motor only AC motor only HEATER 2 OPTIONAL CN30 BLUE YELLOW OPTIONAL 16022000019211 OUTDOOR WIRING DIAGRAM PO W ER SUPPLY TO I N D O O R U N I T Page 9...
  • Page 12 Page 10...
  • Page 13 Page 11...
  • Page 14 Page 12...
  • Page 15 PCB board of DRA1U09S1A, DRA1U12S1A Page 13...
  • Page 16 PCB board of DRA1U18S1A, DRA1U24S1A PCB board of DRA1U18S1A, DRA1U24S1A Page 14...
  • Page 17 IPM board After power on, LED3(Green color) and LED2(Red color) will be flash if the unit has some problems 。 Problems LED3(Green) LED3(Red) IU display standby for normal Operation normally IPM malfunction or IGBT over-strong current FLASH (2.5Hz) protection Over voltage or too low voltage protection EEPROM parameter error FLASH Inverter compressor drive error...

  • Page 18: Product Features

    Product Features Contents Operation Modes and Functions ................ Abbreviation ....................Safety Features .................... Display Function ..................Fan Mode ....................Cooling Mode ..................... Heating Mode (For heat pump models) ............Auto-mode ....................Drying Mode ....................Forced Operation Function ................1.10 Timer Function .................... 1.11 Sleep Function .....................
  • Page 19 1. Operation Modes and Functions corresponding error code, allowing for emergency use. • When more than one temperature sensor is malfunctioning, the air conditioner ceases operation. Abbreviation Refrigerant leakage detection Unit element abbreviations This function is active only when mode is selected. It will detect if the compressor is being damaged by refrigerant Abbreviation Element...
  • Page 20 Fan Mode When evaporator temperature drops below a configured value, the compressor ceases operation. When fan mode is activated: Heating Mode (For heat pump models) • The outdoor fan and compressor are stopped. • Temperature control is disabled and no temperature 1.6.1 Compressor Control setting is displayed.
  • Page 21 1.6.5 Evaporator Temperature Protection • fan speed • sleeping mode When the evaporator temperature exceeds a preset protection value, the compressor stops. • Follow me Auto-mode 1.10 Timer function • This mode can be selected with the remote controller . •...
  • Page 22 automatically stores the current settings (not including sets the temperature according to the measurements the swing setting) and, in the case of a sudden power from the remote control. failure, will restore those setting automatically within 3 • The unit will only change modes if the information minutes after power returns.
  • Page 23 Displayed Displayed code Explanation Meaning Additional Notes value Room temperature All displayed temperatures use actual values. Indoor coil temperature All temperatures are -1F,-1E,-1d,-1c,- -25,-24,-23,-22, displayed in °C regardless Outdoor coil 1b,-1A -21,-20 of remote used. temperature -19—99 -19—99 T1, T2, T3, T4, and T2B Ambient display ranges from -25 to A0,A1,…A9...
  • Page 24 Displayed Displayed code Explanation Meaning Additional Notes value Reserved 0-FF Page 22...

  • Page 25: Maintenance And Disassembly

    Maintenance and Disassembly Contents Maintenance ......................First Time Installation Check ................ Refrigerant Recharge ................... Re-Installation ..................... 1.3.1 Indoor Unit .................. 1.3.2 Outdoor Unit ................Disassembly ......................Indoor Unit ....................Outdoor Unit ....................

  • Page 26: Maintenance

    1. Maintenance First Time Installation Check To prevent air and moisture from a ecting the air Air and moisture trapped in the refrigerant system a ects conditioner’ s performance, the indoor unit, as well as the the performance of the air conditioner by: pipes between the indoor and outdoor unit, must be be •...
  • Page 27 Procedure: (14.5 Psi) after 50 minutes, check for leakage. Tighten the flare nuts of the indoor and outdoor units, and confirm that both the 2- and 3-way valves • If the pressure successfully reaches -0.1 MPa are closed. (14.5 Psi), fully close the Handle Lo valve, then Connect the charge hose with the push pin of Handle cease vacuum pump operations.

  • Page 28: Refrigerant Recharge

    Refrigerant Recharge Prior to recharging the refrigerant, confirm the additional amount of refrigerant required using the following table: Models Standard length Max. elevation Max. length Additional refrigerant 9k&12k 7.5m (24.6ft) 10m (32.8ft) 25m (82.0ft) 15g/m (0.16oz/ft) 7.5m (24.6ft) 20m (65.6ft) 30m (98.4ft) 15g/m (0.16oz/ft) 7.5m (24.6ft)

  • Page 29: Re-Installation

    Re-Installation 1.3.1 Indoor Unit Collecting the refrigerant into the outdoor unit Procedure: (14.5 Psi). Confirm that the 2- and 3-way valves are opened. Connect the charge hose with the push pin of Handle Close the 3-way valve so that the gauge rests between 0.3 MPa (43.5 Psi) and 0.5 MPa (72.5 Psi).
  • Page 30 Air purging with vacuum pump Procedure: Tighten the flare nuts of the indoor and outdoor (14.5 Psi) after 50 minutes, check for leakage. units, and confirm that both the 2- and 3-way valves • If the pressure successfully reaches -0.1 MPa are closed.

  • Page 31: Outdoor Unit

    1.3.2 Outdoor Unit Evacuation for the whole system Procedure: Wait for five minutes then check whether the gauge Confirm that the 2- and 3-way valves are opened. needle moves after turning o the vacuum pump. If Connect the vacuum pump to the 3-way valve’ s the gauge needle moves backward, check whether service port.
  • Page 32 Refrigerant charging Procedure: Tighten the flare nuts of the indoor and outdoor and record the starting weight. units, and confirm that both the 2- and 3-way valves Fully open the Handle Lo manifold valve, 2- and are closed. 3-way valves. Slightly connect the Handle Lo charge hose to the Operate the air conditioner in cooling mode and 3-way service port.

  • Page 33: Disassembly

    2. Disassembly Indoor unit Front Panel Procedure Illustration 1) Hold the front panel by the tabs on Front Panel the both sides and lift it (see CJ_AB_ INV_001). CJ_AB_INV_001 2) Push up the bottom of an air filter (step 1), and then pull it out downwards (step 2) (see CJ_AB_ INV_002).
  • Page 34 Procedure Illustration 3) Open the horizontal louver and push the hook towards left to open it (see CJ_AB_INV_003). Horizontal Louver Hook CJ_AB_INV_003 4) Bend the horizontal louver lightly by both hands to loosen the hooks, then remove the horizontal louver (see CJ_AB_INV_004).
  • Page 35 Procedure Illustration 5) Pry the electrical cover by a screw driver, and rotate it towards left, then remove it. (see CJ_AB_INV_005). CJ_AB_INV_005 6) Disconnect the connector for display board. (see CJ_AB_INV_006) . CJ_AB_INV_006 Note: This section is for reference only. Actual unit appearance may vary. Page 33...
  • Page 36 Procedure Illustration 7) Slid the front panel side to side to release each axis (see CJ_AB_INV_007 ) CJ_AB_INV_007 8) Open the screw cap and then remove the 3 screws (see CJ_AB_INV_008). CJ_AB_INV_008 Note: This section is for reference only. Actual unit appearance may vary. Page 34...
  • Page 37 Procedure Illustration 9) Release the hooks with hands . (see CJ_AB_INV_009) CJ_AB_INV_009 10) Release the 5 hooks in the back (see CJ_AB_INV_010). Hooks CJ_AB_INV_010 11) Pull out the panel frame while pushing the hook through a clearance between the panel frame and the heat exchanger.
  • Page 38 Procedure Illustration 12) Release the 5 hooks of the vertical blades, then pull the vertical blades Hooks rightward and remove it (see CJ_AB_ INV_012). CJ_AB_INV_012 13) Remove 1 screw of the display board. (see CJ_AB_INV_013). 14) Rotate the display board in the direction shown in the right picture.
  • Page 39 Electrical parts (Antistatic gloves must be worn.) Note: Remove the front panel (refer to 1. Front panel) before disassembling electrical parts. Procedure Illustration Ground Screws 1) Cut the ribbon by a shear, then pull out the coil temperature sensor (T2) (see CJ_AB_INV_014).
  • Page 40 Procedure Illustration 4) Remove the fixed devices of the connectors (see CJ_AB_INV_016). CJ_AB_INV_016 CJ_AF_INV_011-1 5) Disconnect the connectors of fan motor, the step motor and the T2 sensor (see CJ_AB_INV_017). CJ_AB_INV_017 6) Open the left side plate of electronic control box (see CJ_AB_INV_018). CJ_AB_INV_018 Note: This section is for reference only.
  • Page 41 Procedure Illustration 7) Open the two clips on the front of the electric box. (see CJ_AB_INV_019) CJ_AB_INV_019 8) Open the upper cover plate of electronic control box (see CJ_AB_ INV_020). CJ_AB_INV_020 Note: This section is for reference only. Actual unit appearance may vary. Page 39...
  • Page 42 Procedure Illustration 9) Remove 1 screw and open the 2 clips along the direction indicated in right image (see CJ_AB_INV_021). CJ_AB_INV_021 Display board 10) Pull out the electrical main board along the direction indicated in right image to remove it (see CJ_AB_ INV_022).
  • Page 43 Evaporator Note: Remove the front panel and electrical parts (refer to 1. Front panel and 2. Electrical parts) before disassembling evaporator. Procedure Illustration 1) Disassemble the pipe holder located at the rear of the unit (see CJ_AB_INV_023). Pipe Holder CJ_AB_INV_023 Screw 2) Remove the 1 screws on the evaporator located at the fixed plate (see CJ_AB_...
  • Page 44 Procedure Illustration 3) Release the hook on the evaporator (see CJ_AB_INV_025). CJ_AB_INV_025 4) Remote the one screw on the evaporator located at the fixed plate (see CJ_AB_ INV_026). CJ_AB_INV_026 5) Pull out the evaporator (see CJ_AB_ INV_027). CJ_AB_INV_027 Note: This section is for reference only. Actual unit appearance may vary. Page 42...
  • Page 45 Fan motor and fan Note: Remove the front panel, electrical parts and evaporator (refer to 1. Front panel, 2. Electrical parts, and 3. Evaporator). before disassembling fan motor and fan. Procedure Illustration 1) Remove the two screws and remove the fixing board of the fan motor (see CJ_AB_ INV_028).
  • Page 46 Procedure Illustration 3) Remove the fixing screw (see CJ_AB_ INV_030). 4) Pull out the fan motor and fan assembly from the side. Fixing Screw CJ_AB_INV_030 Note: This section is for reference only. Actual unit appearance may vary. Page 44...
  • Page 47 Step motor Note: Remove the front panel and electrical parts (refer to 1. Front panel, 2. Electrical parts) before disassembling step motor. Procedure Illustration 1) Remove the two screws, then remove the stepping motor (see CJ_AB_INV_031). Stepping Motor CJ_AB_INV_031 Note: This section is for reference only. Actual unit appearance may vary. Page 45...
  • Page 48 Drain Hose Procedure Illustration 1) Rotate the fixed wire clockwise indicated in right image (see CJ_AB_INV_032). CJ_AB_INV_032 2) Pull up the drain hose to remove it (see CJ_AB_INV_033). CJ_AB_INV_033 Note: This section is for reference only. Actual unit appearance may vary. Page 46...

  • Page 49: Outdoor Unit

    Outdoor unit Panel Plate DRA1U09S1A Procedure Illustration 1) Turn o the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (3 screws) (see CJ_BA30_INV_001). CJ_BA30_INV_001 3) Remove the screws of the top cover...
  • Page 50 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_BA30_INV_003). Front Panel CJ_BA30_INV_003 5) Remove the screws of the rear net and then remove the rear net (2 screws) (see CJ_BA30_INV_004). CJ_BA30_INV_004 Note: This section is for reference only.
  • Page 51 Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_BA30_INV_005). Right Panel CJ_BA30_INV_005 Note: This section is for reference only. Actual unit appearance may vary. Page 49...
  • Page 52 DRA1U12S1A Procedure Illustration 1) Turn o the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (3 screws) (see CJ_B30_INV_001 ). CJ_B30_INV_001 Top Cover 3) Remove the screws of the top cover and then remove the top cover (3 screws).
  • Page 53 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (8 screws) (see CJ_B30_INV_003). Front Panel CJ_B30_INV_003 5) Remove the screws of water collecting cover and then remove the water collecting cover (1 screw) (see CJ_B30_ INV_004).
  • Page 54 Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_B30_INV_005). Right Panel CJ_B30_INV_005 Note: This section is for reference only. Actual unit appearance may vary. Page 52...
  • Page 55 DRA1U18S1A Procedure Illustration 1) Turn o the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (3 screws) (see CJ_CA30_INV_001). CJ_CA30_INV_001 Top Cover 3) Remove the screws of the top cover and then remove the top cover (3 screws).
  • Page 56 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_CA30_INV_003). Front Panel CJ_CA30_INV_003 5) Remove the screws of water collecting Water Collecting Cover cover and then remove the water collecting cover (1 screw) (see CJ_ CA30_INV_004).
  • Page 57 Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (6 screws) (see CJ_CA30_INV_005). Right Panel CJ_CA30_INV_005 Note: This section is for reference only. Actual unit appearance may vary. Page 55...
  • Page 58 DRA1U24S1A Procedure Illustration 1) Turn o the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (2 screws) (see CJ _D30_INV_00 1). Big Handle CJ_D30_INV_001 3) Remove the screws of the top cover and then remove the top cover (4 Top Cover screws).
  • Page 59 Procedure Illustration 4) Remove the screws of the front right panel and then remove the front right panel (2 screws) (see CJ_D30_ INV_003). Front Right Panel CJ_D30_INV_003 5) Remove the screws of the front panel and then remove the front panel (9 screws) (see CJ_D30_ INV_004).
  • Page 60 Procedure Illustration 6) Remove the screws of water collecting cover and then remove the water collecting cover (2 screw) (see CJ_ D30_INV_005). Water Collecting Cover CJ_D30_INV_005 7) Remove the screws of the right panel and then remove the right panel (8 screws) (see CJ_D30_ INV_006).
  • Page 61 Fan disassembly (Antistatic gloves must be worn when you disassemble the electronic box.) Note: Remove the panel plate and (refer to 1. Panel plate) before disassembling fan. DRA1U09S1A, DRA1U12S1A Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_ INV_001 ).
  • Page 62 Procedure Illustration 5) Disconnect the connector for fan motor from the electr onic control board (see CJ_ODU_INV_004 ). CJ_ODU_INV_004 6) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_INV_005 ). 7) Remove the fan motor. Fan Motor CJ_ODU_INV_005 Note: This section is for reference only.
  • Page 63 DRA1U18S1A, DRA1U24S1A Procedure Illustration 1) Remove the nut sec uring the fan with a spanner (see CJ_ODU_ INV_006 ). 2) Remove the fan. D-cut CJ_ODU_INV_006 Hook 3) Unfix the hooks and then open the electronic control box cover (4 hooks) (see CJ_ODU_INV_007 ).
  • Page 64 Procedure Illustration 4) Disconnect the connector for fan motor from the ele ctronic control board (see CJ_ODU_INV_008 ). CJ_ODU_INV_008 5) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_INV_009 ). 6) Remove the fan motor. Fan Motor CJ_ODU_INV_009 Note: This section is for reference only.
  • Page 65 Electrical parts (Antistatic gloves must be worn.) Note: Remove the panel plate and fan assembly (refer to 1. Panel plate and 2. Fan assembly) before disassembling electrical parts. DRA1U09S1A, DRA1U12S1A Procedure Illustration 1) Remove the connector for the compressor (see CJ_ODU_INV_010 ).
  • Page 66 DRA1U18S1A, DRA1U24S1A Procedure Illustration 4-Way Valve 1) Remove the connector for the compressor (see CJ_ODU_INV_011 ). 2) Pull out the two blue wires connected with the four way valve (see CJ_ODU_ Reactor INV_011 ). 3) Pull out connectors of the condenser coil temp.
  • Page 67 Sound blanket WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling sound blanket. Procedure Illustration 1) Remove the sound blanket (side and top) (see CJ_ODU_INV_012 ).
  • Page 68 Four-way valve WARNING: Recover refrigerant from the refrigerant circuit before remove the four-way valve. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling four-way valve. Procedure Illustration 1) Heat up the brazed parts and then detach...
  • Page 69 Compressor WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling compressor. Procedure Illustration 1) Remove the flange nut of terminal cover and remove the termina l cover (see CJ_ ODU_INV_014 ).
  • Page 70 Procedure Illustration 3) Remove the hex nuts and washers securing the compressor, located on the bottom plate (see CJ_ODU_INV_016 ). CJ_ODU_INV_016 Suction Pipe 4) Heat up the brazed parts and then remove the the discharge pipe and the suction pipe (see CJ_ODU_INV_017 ). 5) Lift the compressor from the base pan Discharge Pipe assembly with pliers.

  • Page 71: Troubleshooting

    Troubleshooting Contents Safety Caution ..................... General Troubleshooting ..................Error Diagnosis and Troubleshooting Without Error Code ....... Remote maintenance ................... Field maintenance ..................Quick Maintenance by Error Code ..............Troubleshooting by Error Code ................Common Check Procedures ................. E0/F4 (EEPROM parameter error) ..............E1 (Indoor and outdoor unit communication error) ........
  • Page 72 Contents 5.10 P2(High temperature protection of IPM module diagnosis and solution) ..94 5.11 P4(Inverter compressor drive error diagnosis and solution) ......5.12 P6(Low pressure protection/High pressure protection(36k)/ High temperature protection of IPM module(<36k)diagnosis and solution) ..........

  • Page 73: Safety Caution

    1. Safety Caution WARNING Electricity remains in capacitors even when the power supply is o . Ensure the capacitors are fully discharged before troubleshooting. Electrolytic Capacitors For other models, connect discharge resistance (approx.100 40W) or a soldering iron plug between the positive and negative terminals of the electrolytic capacitor.

  • Page 74: General Troubleshooting

    2. General Troubleshooting Error Display (Indoor Unit) When the indoor unit encounters a recognized error, the operation lamp will flash in a corresponding series, the timer lamp may turn on or begin flashing, and an error code will be displayed. These error codes are described in the following table: Operation Timer lamp...
  • Page 75 The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a temperature reading. Troubleshooting: Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement.

  • Page 76: Error Diagnosis And Troubleshooting Without Error Code

    3. Error Diagnosis and Troubleshooting Without Error Code WARNING Be sure to turn o unit before any maintenance to prevent damage or injury. Remote maintenance SUGGESTION: When troubles occur, please check the following points with customers before field maintenance. Problem Solution Unit will not start Page 76-77...

  • Page 77: Field Maintenance

    Field maintenance Problem Solution Unit will not start Page 78-79 Compressor will not start but fans run Page 78-79 Compressor and condenser (outdoor) fan will not start Page 78-79 Evaporator (indoor) fan will not start Page 78-79 Condenser (Outdoor) fan will not start Page 78-79 Unit runs, but shortly stops Page 78-79...
  • Page 78 1.Remote Maintenance Electrical Circuit Refrigerant Circuit Possible causes of trouble Unit will not start The power switch is on but fans will not start The temperature on the display board cannot be set Unit is on but the wind is not cold(hot) Unit runs, but shortly stops The unit starts up and stops frequently Unit runs con�nuously but insufficient cooling(hea�ng)
  • Page 79 Others Page 77...
  • Page 80 Electrical Circuit 2.Field Maintenance Possible causes of trouble Unit will not start Compressor will not start but fans run Compressor and condenser (outdoor) fan will not start Evaporator (indoor) fan will not start Condenser (Outdoor) fan will not start Unit runs, but shortly stops Compressor short-cycles due to overload High discharge pressure Low discharge pressure...
  • Page 81 Refrigerant Circuit Others Page 79...

  • Page 82: Quick Maintenance By Error Code

    4. Quick Maintenance by Error Code If you do not have the time to test whether specific parts are faulty, you can directly change the required parts according the error code. You can find the parts to replace by error code in the following table. Error Code Part requiring replacement...

  • Page 83: Troubleshooting By Error Code

    5. Troubleshooting by Error Code Common Check Procedures 5.1.1 Temperature Sensor Check Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(Tp) sensor.
  • Page 84 5.1.3 IPM Continuity Check Turn o the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. Normal resistance Normal resistance Digital tester Digital tester value value...

  • Page 85: E0/F4 (Eeprom Parameter Error)

    E0/F4 (EEPROM parameter error) Description : Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: • Faulty indoor PCB • Faulty outdoor PCB Troubleshooting and repair: Shut o the power supply and turn it on 2 minutes later.

  • Page 86: E1 (Indoor And Outdoor Unit Communication Error)

    E1 (Indoor and outdoor unit communication error) Description : The indoor unit has not received feedback from the outdoor unit for 110 seconds, four consecutive times. Recommended parts to prepare: • Faulty indoor PCB • Faulty outdoor PCB • Faulty reactor Troubleshooting and repair: Power o , then restart the unit after 2 minutes.

  • Page 87: E3/F5 (Fan Speed Has Been Out Of Control Diagnosis And Solution)

    Remarks: • Use a multimeter to test the DC voltage between 2 port and 3 port of outdoor unit. The red pin of multimeter connects with 2 port while the black pin is for 3 port. • When AC is normal running, the voltage will move alternately between -25V to 25V. •...
  • Page 88 E3/F5(Fan speed is operating outside of the normal range) Description : When the indoor fan speed keeps too low (300RPM) for certain time, the unit will stop and the LED will display the failure(E3). When the outdoor fan speed registers below 200RPM or over 1500RPM for an extended period of time, the unit will stop and the LED will display the failure(F5).
  • Page 89 Index: 1. Indoor or Outdoor DC Fan Motor(control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced. •...

  • Page 90: E4/E5/F1/F2/F3

    E4/E5/F1/F2/F3 (Open circuit or short circuit of temperature sensor diagnosis and solution) Description : If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure. Recommended parts to prepare: • Wiring mistake • Faulty sensor •...

  • Page 91: Ec (Refrigerant Leakage Detection Diagnosis And Solution)

    EC (Refrigerant Leakage Detection diagnosis and solution) Description : Define the evaporator coil temperature T2 of the compressor just starts running as Tcool. In the beginning 8 minutes after the compressor starts up, if T2 <Tcool-1°C (Tcool-33.8°F) does not keep continuous 4 seconds and compressor running frequency higher than 50Hz does not keep continuous 3 minutes, and this situation happens 3 times, the display area will show “EC”...

  • Page 92: F0(Overload Current Protection Diagnosis And Solution)

    F0(Overload current protection diagnosis and solution) Description : An abnormal current rise is detected by checking the speci ed current detection circuit. Recommended parts to prepare: • Power supply problems. • System blockage • Faulty PCB • Wiring mistake • Compressor malfunction Troubleshooting and repair Check the power supply .

  • Page 93: Solution)

    P0(IPM malfunction or IGBT over-strong current protection diagnosis and solution) Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows “P0” and the AC turn o . Recommended parts to prepare: •...
  • Page 94 For 30K~36K: At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the IPM is defective. Otherwise, please follow the procedure below: Check whether the power voltage Restart the unit when the power supply gets is normal.

  • Page 95: P1(Over Voltage Or Too Low Voltage Protection Diagnosis And Solution)

    P1(Over voltage or too low voltage protection diagnosis and solution) Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit. Recommended parts to prepare: • Power supply issues • System leakage or blockage • Faulty PCB Troubleshooting and repair: Check the power supply .
  • Page 96 5.10 P2(High temperature protection of IPM module diagnosis and solution) Description: If the temperature of IPM module is higher than setting value, the LED displays this failure code. Recommended parts to prepare: • Faulty PCB • Connection problems Troubleshooting and repair: Check the fastening screws on the PCB and IPM radiator.
  • Page 97 5.11 P4(Inverter compressor drive error diagnosis and solution) Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Recommended parts to prepare: • Wiring mistake •...
  • Page 98 For 336K: At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the IPM is defective. Otherwise, please follow the procedure below: Check whether the power voltage Restart the unit when the power supply gets is normal.
  • Page 99 5.12 P6(Low pressure protection/High pressure protection(36k model)/ High temperature protection of IPM module(<36k models) diagnosis and solution) Description: When the pressure of system reach a certain value, the low pressure protector will switch o . After the pressure resume to normal ,the protection code will disappear. Recommended parts to prepare: •...
  • Page 100 For 36k: Power o , then restart the unit after 2 minutes. Power o , then restart the unit after 2 minutes. Does a problem remain ? The unit is operating normally Does a problem remain ? The unit is operating normally Power on and set cooling mode Power on and set cooling mode Check pressure of gas valve...

  • Page 101: Appendix

    Appendix Contents Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) .. 100 Temperature Sensor Resistance Value Table for TP (°C --K) ......iii) T(°F)=(9 T(°C))/5 ....................Pressure On Service Port ...................

  • Page 102: I) Temperature Sensor Resistance Value Table For T1,T2,T3 And T4 (°C - K)

    Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073 0.59386 96.3423 10.9731 2.11241...

  • Page 103: Ii) Temperature Sensor Resistance Value Table For Tp (°C --K)

    ii) Temperature Sensor Resistance Value Table for TP (°C --K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 542.7 68.66...

  • Page 104: Iii) T(°F)=(9 T

    iii) T(°F)=(9 T(°C))/5 °C °F °C °F °C °F °C °F °C °F 69.8 123.8 179.6 235.4 24.8 71.6 125.6 181.4 237.2 26.6 73.4 127.4 183.2 28.4 75.2 129.2 240.8 30.2 186.8 242.6 25.5 77.9 132.8 188.6 244.4 32.9 78.8 134.6 190.4 246.2...

  • Page 105: Iv) Pressure On Service Port

    iv) Pressure On Service Port(R410A) Cooling chart: °F(°C) 0(-17) 5(-15) 95 (35) (9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) 70/59 10.1 10.6 75/63 10.7 11.2 80/67 11.2 11.9 90/73 10.5 10.3 10.0 10.6 12.4 13.0 °F(°C) 0(-17) 5(-15) 95 (35) (9.44) (7.22) (23.89)

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