Westinghouse WHU09DHA21S Service Manual page 35

Outdoor unit
9K/12K/18K
DC-Inverter unitary (Main control board upside-down)
Fault code displayed by LED lamps on outdoor main control board.
There are 3 LED lamps on control board, LED1, LED2 and LED3.
LED1 indicates fault code represented by 2-digit number, LED2 indicates fault code represented
by single digit number and LED3 indicates outdoor drive control fault.
When LED3 is off, LED1 and LED 2 indicate main control fault code.
When LED3 is on, LED1 and LED 2 indicate drive control fault code.
When LED3 is flickering and LED1, LED 2 are all off, indicate compressor is preheating. Failures
display with 5s interval. It means LED will be off for 5s to report the next fault code.
System protection codes display method is the same with main control fault code.
LED lamps will be off when there is no failure, protection or preheating.
For example, outdoor main control fault 32:
For example, outdoor drive fault 32:
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