Haier HSU-18HVA103/R2(DB) - Thermistor or Related Abnormality(outdoor unit)

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