Haier HSU-12HSA03/R2(DB) manual Edition, Replace the outdoor mainboard with a new one

Haier air conditioner Edition: 10061116

F3: Communication fault between the IPM and outdoor PCB

1, Check whether Terminal CN7 on the outdoor mainboard, CN10 on IPM module are well inserted.

2, Check whether the connected wire between IPM and outdoor is well

No

Electrify the machine again and turn it on, check whether the voltage between 1 and 4of Terminal CN7 is about 12V DC

No

Replace the outdoor mainboard with a new one

Yes

Yes

1, Pull out and reinsert the terminals.

2, Replace connected wire

Replace the outdoor IPM module with a new one.

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