Haier HSU-18,22HVA103/R2(DB) Service Manual page 81

Communication is detected by checking the IPM module and the outdoor PCB
Method of
Malfunction
Detection
■ The outdoor PCB broken leads to communication fault
Malfunction
■ The IPM module broken leads to communication fault
Decision
Conditions
Supposed ■ The outdoor PCB is broken
■ The IPM module is broken
Causes
■ Communication wiring disconnected
* Caution Be sure to turn off power switch before connect or disconnect connector,
Troubleshooting
1) Check whether Terminal CN14 and CN8 on the outdoor
mainboard CN10 and CN11 on IPM module
2) Check whether the connected wire between IPM and outdoor
Are they good?
Electrify the machine again and turn it
on, Check whether the voltage between
1 and 2 of Terminal CN8 is about DC5V,
Check whether the voltage between2
and 3 of Terminal CN8 is about DC15V,
Replace the outdoor mainboard with a new one
HSU-18,22HVA103/R2(DB)
else parts damage may be occurred.
YES
NO
NO
1) Pull out and reinsert the terminals.
2) Replace connected wire
YES
Replace the outdoor IPM module
with a new one.
80
Service Diagnosis
or
Domestic Air Conditioner