Westinghouse WHP07WMA21S Service Manual page 45

HOW TO CHECK FAULT CODES
1) 18 model
2) 18/24/36/42 models
Main control failure
Fault code will display on 7 segment display on outdoor control board.
Drive failure indicator
V17: Ten digit number
V18: Single digit number
Main Control Board
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Main control failure indicator
V15: Ten digit number
V16: Single digit number
Outdoor
Control Board
7 segment
display