McQuay MWM-LW

117
Troubleshooting
Troubleshooting
Model Board
MWM07/10/15/20/25LW 50WJWXX
MWM301W W2
MCK020/025/030/040/050EW W3
MCK010/015/020CW W2
MCC10/15/20/25/28/30/38/40/50/60CW W2
MCM20/25/30/40/50DW W2
MCM15/20/25EW W2
MDB75/100/125/150BW N/A
Self Diagnostic Table - 50WJWXX Board
COOL/HEAT
(GREEN/RED)
Normal Operation/Fault Indication Action Error Code
Green
Cool mode - -
Red
Heat mode - -
Timer on - -
Sleep mode on - -
Fan mode on - -
Dry mode on - -
1 time
Room air sensor contact
Loose/Short
Call your dealer Blink E1
2 times
Indoor coil sensor open/short Call your dealer Blink E2
3 times
Pipe water temperature poor - Blink E4
1 time
Pipe water temperature bad - Blink E5
6 times
Hardware error (tact switch pin short)
Call your dealer Blink E8
4 times
No feedback from indoor fan
Call your dealer Blink E9
ON
ON or OFF
Blinking