McQuay MWM Service Manual page 70

MCQUAY Service Guide Book
GS01 – Inverter Y Models
Diagnosis Step
1. Hold down ON TIMER CANCEL button or OFF TIMER CANCEL button for 5 seconds, a "
indication flashes on the temperature display section.
2. Press TIMER CANCEL repeatedly until indoor buzzer produces a long beep. This indicates the error
code, refers to Error Codes table and is displayed on the temperature display section.
3. A short beep or two consecutive beeps indicate non-corresponding error codes.
4. To cancel the error code display, hold down ON TIMER CANCEL button or OFF TIMER CANCEL
button for 5 seconds. Alternatively, the code display will cancel itself if the button is not pressed for 1
minute.
Error Code Diagnosis by Unit Last State Memory
1. Remove battery from remote controller
2. Replace battery again into remote controller
3. Press Mode & ON/OFF buttons together
4. Press Mode button to 5:00
5. Press ON/OFF once
6. Repeat the fault diagnosis steps by wireless handset GS01
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Diagnosis
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