Westinghouse WHM24DMA21S Service Manual page 39

Fault
Fault description
code
16 Low DC voltage 200V
Driver board read EE
18
data error
PFC chip receives
19
data fault
PFC soft start
20
abnormally
The compressor drive
21 chip could not receive
data from PFC chip.
Possible reasons for abnormality
1. Voltage input is too low;
2. Drive board fault.
1. EEPROM has no data or data error;
2. EEPROM circuit fault.
Abnormal communication loop.
Abnormal PFC drive loop.
Communication loop fault.
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How to deal with
1. Check the power supply.
2. Change the driver board.
1. Change EEPROM component;
2. Change the driver board.
Change the drive board.
Change the drive board.
Change the drive board.