McQuay Air Conditioner Error Codes

AC BrandsMcQuay
Error CodesTrouble
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 high pressure faulty
H4Compressor 1 low pressure faulty
L1Temperature of water entering too high or low
L3Water flow switch faulty
L4System 1 leaving water temperature 1 faulty

Wall Mounted K-Series Inverter-Y model

McQuay AC Error Code Diagnosis
McQuay AC Error Code Diagnosis

00: Normal

UA: Indoor-outdoor 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 Temperature Sensor

C9: Faulty Suction Air Temperature 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 Temperature 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 Temperature Sensor

J3: Faulty Discharge Pipe Temperature Sensor

J6: Faulty Heat Exchanger Temperature Sensor

L3: Electrical Parts Heat Fault

L4: High Temperature At Inverter Circuit Heatsink

L5: Output Overcurrent

P4: Faulty 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)

Leave a Reply

Your email address will not be published. Required fields are marked *

Fill out this field
Fill out this field
Please enter a valid email address.
You need to agree with the terms to proceed

You May Also Like

midea ac error codes
Midea AC Error Codes and Troubleshooting
maxon ac error codes
Maxon Air Conditioner Error Codes

Subscribe to our Youtube Channel

Must Read