Haier HSU-12HSA03/R2(DB) Manuale Utente

Haier air conditioner

Edition: 10061116

- 5 3 -

F3: Communication fault between the IPM and outdoor PCB

1, Check whether Terminal CN

7

on the outdoor mainboard,  CN10 

on IPM module are well inserted.

2, Check whether the connected wire 

between IPM and outdoor is well

Electrify the machine again and turn it on, 

check whether the voltage between 1 and 

4of

Terminal CN

7 is about 12V DC

No

Replace the outdoor 

mainboard with a new one

Replace the outdoor IPM

module with a new one.

No

1, Pull out and reinsert the 

terminals.

2, Replace connected wire

Yes

Yes