Haier H-MRV Series Service Manual page 192

Models with wired controller
N/A
Description: Fault with 12V supply of heavy current board in expansion valve
Check if there are noticeable burns or hot
components in the mainboard. Use a
multimeter to check if the 12V supply in
7805 chip of mainboard is in good
condition. Measure the central and the left
pins of the chip. Check if the mainboard is
properly connected.
Replace the mainboard
Models with wired controller
N/A
Description: Fault with polarity of indoor unit (to be determined)
Check if the null wire and the live wire
of indoor unit are properly connected.
Check if the mainboard and the fan wire
are noticeably damage.
It's recommended to bring spare parts of
fan. Connect the fan to see if there is any
alarm. If yes, replace the mainboard. If no,
replace the fan.
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Models with wireless remote controller
8 flashes of Timer light
Models with wireless remote controller
9 flashes of Timer light
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