Haier AU142AFBEA [302/365] Ipm power module protection

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Check mainboard and make

necessary replacement

yes

Replace power module

1.Is output voltage among U, V and W balanced?

2.Disconnect all terminals. Is resistance between P

and N; P and U, V, W; N and U, V, W acceptable?

1.Is voltage of supply circuit too low?

2.Is heat exchanger or indoor fan motor broken?

3.Is ambient temperature too high? Is system

overloaded?

yes

Is current up to protection

limit of power module?

Is silica gel well distributed on radiation fins?

yes

Is power module too hot?

yes

Is compressor winding resistance

acceptable? Is it stuck?

if the compressor is normal

Replace PCB

yes

Check if the four-way power supply

voltage of PCB is less than 13.5V

(normal value: 15VDC)

yes

Replace rectifiter or

electrolytic capacitor

Measure + and - terminals of

electrolytic capacitor. Is output voltage

of rectifier acceptable (310VDC at

220V.)

yes

Check and reconnect

yes

1.Replace outdoor motor

or fan capacitor

2.Replace PCB

check if outdoor motor is normal(in

cooling, not running or speed too

low, or not stop in heating)

Confirm the module

failure according to the

fault code list

12) IPM power module protection

Possible causes: 1. Short-circuit or overcurrent

2.Control power supply is less than 13.5V.

3.Module is overheat with a temperature higher than 145° C.

yes

check if there is bad

connection in electric

circuit

Replace compressor

-302-

Haier AU142AFBEA [302/365] Ipm power module protection

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