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McQuay Air Conditioner Error Codes

 

McQuay Air Conditioner Error Codes
McQuay Air Conditioner Error Codes
Error CodesProblem
E1Compressor 2 low pressure faulty
E2Compressor 2 high pressure faulty
E3Compressor 2 overload
E4Indoor coil 2 temperature sensor fault
E5System 2 leaving water temperature 2 faulty
F2Indoor coil 1 temperature sensor fault
F4Return air temperature sensor fault
F6Communication faulty
F9Compressor  1 refrigerant leak
FECompressor 2 refrigerant leak
H1Compressor 1 overload
H4Compressor 1 high pressure faulty
L1Compressor 1 low pressure faulty
L3Temperature of water entering too high or low
L4Water flow switch faulty
L5System 1 leaving water temperature 1 faulty
McQuay Air Conditioner Remote Control
McQuay Air Conditioner Remote Control

Single Split Inverter-Y Model Indoor Series

Error CodesError Description
0Normal
F6Heat exchanger overheat
U0Insufficient gas
H0Compressor sensor system abnormality
U2DC voltage out of range
H3High pressure switch error
U4Communication error
H6Position sensor abnormality
U7Signal transmission error (on outdoor unit PCB)
H8AC current sensor error
UAInstallation error
H9Outdoor air thermistor short / open
UFCommunication Error (indoor and outdoor) piping and wiring
J1Pressure sensor error
UHAnti-freeze function in other room
J3Compressor discharge pipe thermistor short /open / misplaced
A1Indoor PCB error
J5Suction pipe thermistor short/ open
A3Water pump error
J6Outdoor heat exchanger
A5Antifreeze
J7Subcooling heat exchanger thermistor short/ open
A6Indoor fan motor abnormal
J8Liquid pipe thermistor short/ open
C4Indoor heat exchanger thermistor short/ open
J9Gas pipe thermistor abnormality
C9Indoor room thermistor short/ open
LCCommunication error (control PCB and inverter PCB)
L1Outdoor PCB error
L3Electrical box temperature rise
L4Heat sink overheat
E1Outdoor PCB error
E3High pressure protection
E4Low pressure protection
E5Compressor motor lock
L5IPM error / IGBT error
E6Compressor start-up error
L8Electrical thermal switch
E7Outdoor DC fan motor lock
L9Stall prevention
E8Ac input over current
P1Open phase or voltage unbalance
E9EXV error
P4Heat sink thermistor short / open
EA4-way valve error
PJCapacity setting error
F3Discharge pipe overheat

Wall Mounted K-Series Inverter-Y model

McQuay AC Error Code Diagnosis
McQuay AC Error Code Diagnosis
Error CodesMeaning
00Normal
UAIndoor-outdoor Unit Combination Fault
UORefrigerant Shortage
U2Drop Voltage Or Main Circuit Overvoltage
U4Failure Of Transmission (Between Indoor Unit And Outdoor Unit)
A1Indoor Pcb Defectiveness
A5High Pressure Control Or Freeze-up Protector
A6Fan Motor Fault
C4Faulty Heat Exchanger Temperature Sensor
C9Faulty Suction Air Temperature Sensor
EACooling-heating Switching Error
E1Circuit Board Fault
E5Ol Started
E6Faulty Compressor Start Up
E7Dc Fan Motor Fault
E8Overcurrent Input
F3High Temperature Discharge Ppe Control
F6High Pressrue Control (In Cooling)
H0Sensor Fault
H6Operation Fault Due To Faulty Position Detection Sensor
H8Dc Current Sensor Fault
H9Faulty Suction Air Temperature Sensor
J3Faulty Discharge Pipe Temperature Sensor
J6Faulty Heat Exchanger Temperature Sensor
L3Electrical Parts Heat Fault
L4High Temperature At Inverter Circuit Heatsink
L5Output Overcurrent
P4Faulty Inverter Circuit Heatsink Temperature Sensor

Error Diagnosis by Wired Controller (MC301):

McQuay Air Conditioner Remote Control Error Codes
McQuay Air Conditioner Remote Control Error Codes

E0: System malfunction

E1: Sensor Broken (TH1 discharge Temp.)

E2: Sensor Broken (TH2 inlet coil 1#)

E3: Sensor Broken (TH3 mid coil 1#)

E4: Sensor Broken (TH4 inlet coil 2#)

E5: Sensor Broken (TH5 mid coil 2#)

E6: Sensor Broken (TH6 inlet coil 3#)

E7: Sensor Broken (TH7 mid coil 3#)

E8: Sensor Broken (TH8 ambient temp)

E9: Sensor Broken (TH9 outlet coil)

EA: Sensor Broken (TH10 subcool outlet)

EB: Sensor Broken (TH11 subcool suction)

EC: Sensor Broken (TH12 suction)

EF: Emergency Run

F0: Outdoor Storage Malfunction

F1: Sensor Broken (indoor inlet coil)

F2: Sensor Broken (indoor mid coil)

F3: Sensor Broken (indoor outlet coil)

F4: Sensor Broken (indoor return air)

F5: Sensor Broken (indoor supply air)

F6: Indoor and controller communication malfunction

F7: Ambient temp exceed the limit

F8: 4WV malfunction

F9: Refrigerant leakage

FA: Controller storage malfunction

FB: Water Pump (indoor water pump)

FC: Indoor and outdoor communication malfunction

FE: Outdoor master and slave communication malfunction

H0: Digital comp overload

H1: Fixed Comp1 overload

H2: Fixed Comp2 overload

H3: Fixed Comp3 overload

H4: High pressure too high

H5: Sensor broken, high pressure

H6: Discharge temp too high

L0: Super heat too low

L1: Low pressure too low

L2: Sensor broken, low pressure

10: System malfunction

11: Sensor broken (slave TH1 discharge temp)

12: Sensor broken (slave TH2 inlet coil 1#)

13: Sensor Broken (slave TH3 mid coil 1#)

14: Sensor broken (slave TH4 inlet coil 2#)

15: Sensor broken (slave TH5 mid coil 2#)

16: Sensor broken (slave TH6 inlet coil 3#)

17: Sensor broken (slave TH7 mid coil 3#)

18: Sensor broken (slave TH8 ambient temp)

19: Sensor broken (slave TH9 outlet coil)

1A: Sensor broken (slave TH10 subcool outlet)

1B: Sensor broken (slave TH11 subcool suction)

1C: Sensor Broken (slave TH12 suction)

1F: Emergency run (slave)

20: Outdoor storage (slave)

27: Ambient temp exceed the limit (slave)

28: 4WV malfunction (slave)

29: Refrigerant leakage (slave)

30: Digital comp overload (slave)

31: Fixed comp1 overload (slave)

32: Fixed comp2 overload (slave)

33: Fixed comp 3 overload (slave)

34: High pressure too high (slave)

35: Sensor broken, high pressure (slave)

36: Discharge temp too high (slave)

40: Super heat too low (slave)

41: Low pressure too low (slave)

42: Sensor broken, low pressure (slave)

Mcquay Cassette AC Error Codes

Mcquay Cassette AC Error Codes
Mcquay Cassette AC Error Codes

Wired Remote Control (Universal Board)

Display: E1 Blinking

Faulty Indication: Room sensor contact loose/ short

Display: E2 Blinking

Faulty Indication: Indoor coil sensor contact loose/ short

Display: E3 Blinking

Faulty Indication: Outdoor coil sensor contact loose/ short

Display: E4 Blinking

Faulty Indication: Compressor overload

Display: E5 Blinking

Faulty Indication: Gas leak

Display: E6 Blinking

Faulty Indication: Pump faulty

Display: Heat LED Blinking

Faulty Indication: Outdoor defrost (for Heatpump only)

Phase Sequencer
Phase Sequencer

McQuay PTAC Error Codes

McQuay PTAC Error Codes
McQuay PTAC Error Codes

Remote Controller Error Display:

E01: Room temperature sensor open. Automatically reset to restoration error.

E02: Room temperature sensor short. Automatically reset to restoration error.

E03: Error input from indoor unit or Outdoor unit.

McQuay PTAC Error Codes E1 - E35
McQuay PTAC Error Codes E1 – E35

McQuay Air Conditioner Troubleshooting

When a malfunction of the air conditioner unit is detected, immediately switch off the main power supply before proceeding with the following troubleshooting procedures.

The following are common fault conditions and simple troubleshooting tips. If any other fault conditions which are not listed occur, contact your nearest local dealer. DO NOT attempt to troubleshoot the unit by yourself.

Fault ConditionsPossible causes / corrective actions
The air conditioner unit will not resume after power failure.The auto restart function is not functioning. Please turn on the unit with the wireless / wired controller.
The airfl ow is too slow or room cannot be cooled suffi ciently.
  • The air filter is dirty.

  • The doors and windows are opened.

  • The air suction and discharge of both indoor and outdoor units are clogged or blocked.

  • The regulated temperature or temperature setting is not low enough

    • Discharge airfl ow has bad odor.
  • Cigarettes, smoke particles, perfume and others, which might have adhered onto the coil, may cause odor.

  • Contact your nearest dealer

    • Condensation on the front air grille of the indoor unit.
  • This is caused by air humidity after an extended period of operation.

  • The set temperature is too low. Increase the temperature setting and operate the unit at high fan speed

    • Water fl owing out from the air conditioner.Switch off the unit and contact your nearest dealer. This might be due to tilted installation.
    Hissing airfl ow sound from the air conditioner unit during operation.Liquid refrigerant fl owing into the evaporator coil.
    The wireless controller display is dim.
  • The batteries are discharged.

  • The batteries are not correctly inserted.

  • The assembly is not good.

    • Compressor operates continuously.
  • Dirty air fi lter. Clean the air fi lter.

  • Temperature setting too low (cooling). Use higher temperature setting.

  • Temperature setting too high (heating), Use lower temperature setting.

    • No cool air comes out during cooling cycle, or no hot air comes out during heating cycle.
  • • Temperature setting too high (cooling). Use lower temperature setting.

  • • Temperature setting too low (heating). Use higher temperature setting.

    • On heating cycle, warm air does not come out.Unit is in defrost mode. Heating operation will resume after defrost cycle ends.

    LED Indicator Lights: Normal Operation and Fault Conditions for Heat Pump Unit

    McQuay AC LED Indicator Lights
    McQuay AC LED Indicator Lights

     

    McQuay Air Conditioning Manual PDF

    Mcquay Cassette AC MANUAL PDF


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