McQuay Air Conditioner Error Codes
McQuay Air Conditioner Error Codes
McQuay Air Conditioner Error Codes
Error Codes Problem
E1 Compressor 2 low pressure faulty
E2 Compressor 2 excessive stress faulty
E3 Compressor 2 overload
E4 Indoor coil 2 Temp. sensor fault
E5 System 2 leaving water Temp. 2 faulty
F2 Indoor coil 1 Temp. sensor fault
F4 Return air Temp. sensor fault
F6 Communication faulty
F9 Compressor 1 refrigerant leak
FE Compressor 2 refrigerant leak
H1 Compressor 1 overload
H4 Compressor 1 excessive pressure faulty
L1 Compressor 1 low pressure faulty
L3 Temp. of water getting into too high or low
L4 Water float transfer faulty
L5 System 1 leaving water Temp. 1 faulty
McQuay Air Conditioner Remote Control
Single Split Inverter-Y Model Indoor Series
Error Codes Error Description
zero Normal
F6 Heat exchanger overheat
U0 Insufficient gas
H0 Compressor sensor gadget abnormality
U2 DC voltage out of range
H3 High stress switch error
U4 Communication error
H6 Position sensor abnormality
U7 Signal transmission error (on outside unit PCB)
H8 AC current sensor error
UA Installation error
H9 Outdoor air thermistor short / open
UF Communication Error (indoor and outside) piping and wiring
J1 Pressure sensor error
UH Anti-freeze function in different room
J3 Compressor discharge pipe thermistor short /open / misplaced
A1 Indoor PCB error
J5 Suction pipe thermistor short/ open
A3 Water pump error
J6 Outdoor warmth exchanger
A5 Antifreeze
J7 Subcooling warmth exchanger thermistor short/ open
A6 Indoor fan motor abnormal
J8 Liquid pipe thermistor short/ open
C4 Indoor warmth exchanger thermistor short/ open
J9 Gas pipe thermistor abnormality
C9 Indoor room thermistor short/ open
LC Communication error (control PCB and inverter PCB)
L1 Outdoor PCB error
L3 Electrical box Temp. rise
L4 Heat sink overheat
E1 Outdoor PCB error
E3 High pressure protection
E4 Low pressure protection
E5 Compressor motor lock
L5 IPM error / IGBT error
E6 Compressor start-up error
L8 Electrical thermal switch
E7 Outdoor DC fan motor lock
L9 Stall prevention
E8 Ac enter over modern-day
P1 Open phase or voltage unbalance
E9 EXV error
P4 Heat sink thermistor short / open
EA 4–manner valve error
PJ Capacity placing error
F3 Discharge pipe overheat
Wall Mounted K-Series Inverter-Y model
Error Codes Meaning
00 Normal
UA Indoor-outside Unit Combination Fault
UO Refrigerant Shortage
U2 Drop Voltage Or Main Circuit Overvoltage
U4 Failure Of Transmission (Between Indoor Unit And Outdoor Unit)
A1 Indoor Pcb Defectiveness
A5 High Pressure Control Or Freeze-up Protector
A6 Fan Motor Fault
C4 Faulty Heat Exchanger Temp. Sensor
C9 Faulty Suction Air Temp. Sensor
EA Cooling-heating Switching Error
E1 Circuit Board Fault
E5 Ol Started
E6 Faulty Compressor Start Up
E7 Dc Fan Motor Fault
E8 Overcurrent Input
F3 High Temp. Discharge Ppe Control
F6 High Pressrue Control (In Cooling)
H0 Sensor Fault
H6 Operation Fault Due To Faulty Position Detection Sensor
H8 Dc Current Sensor Fault
H9 Faulty Suction Air Temp. Sensor
BJ3 Faulty Discharge Pipe Temp. Sensor
J6 Faulty Heat Exchanger Temp. Sensor
L3 Electrical Parts Heat Fault
L4 High Temp. At Inverter Circuit Heatsink
L5 Output Overcurrent
P4 Faulty Inverter Circuit Heatsink Temp. Sensor
Error Diagnosis by Wired Controller (MC301):
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 three#)
E8: Sensor Broken (TH8 ambient temp)
E9: Sensor Broken (TH9 outlet coil)
BEA: 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 go back air)
F5: Sensor Broken (indoor supply air)
F6: Indoor and controller communique malfunction
F7: Ambient temp exceed the limit
F8: 4WV malfunction
F9: Refrigerant leakage
FA: Controller garage malfunction
FB: Water Pump (indoor water pump)
FC: Indoor and out of doors communication malfunction
FE: Outdoor master and slave communique 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 strain
H6: Discharge temp too high
L0: Super warmth too low
L1: Low stress too low
L2: Sensor broken, low stress
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 three#)
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 garage (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 three overload (slave)
34: High stress too excessive (slave)
35: Sensor broken, excessive stress (slave)
36: Discharge temp too excessive (slave)
40: Super warmness too low (slave)
41: Low stress too low (slave)
42: Sensor broken, low stress (slave)
Mcquay Cassette AC Error Codes
Wired Remote Control (Universal Board)
Display: E1 Blinking
Faulty Indication: Room sensor touch loose/ short
Display: E2 Blinking
Faulty Indication: Indoor coil sensor touch loose/ short
Display: E3 Blinking
Faulty Indication: Outdoor coil sensor touch 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)
McQuay PTAC Error Codes
Remote Controller Error Display:
E01: Room Temp. sensor open. Automatically reset to healing error.
E02: Room Temp. sensor short. Automatically reset to healing error.
E03: Error input from indoor unit or Outdoor unit.
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