Haier ESA412K User Manual download pdf (Page 188)

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Confirm operating

conditions

no

yes

yes

no

No need to replace mainboard. The fault may

be caused by power supply

yes

no

Does the same

fault occur before?

yes

no

No need to replace mainboard. Contactor

wasn't in good contact

No need to replace mainboard. (Check

operating status in details, e.g. TIMER feature,

supply failure, thunder storm, interference from

other appliances, etc.) Explain causes of fault

to user.

1.Is supply voltage acceptable?

2.Is temperature setting correct? (e.g. too high)

3.Is system in TIMER mode?

4.Is user aware of product features, etc.

Check the system thoroughly,

e.g. technical data of

components when power-off,

and voltage and current of

check points when power-on

Disconnect contactor

and reconnect it.

(check if fuse or

varistor is broken.)

Does the same

fault occur before?

Switch off air conditioner

temporarily.

6ZLWFK

on air conditioner again

after 1 minute

Does the same

fault occur before?

yes

no

Switch on air

conditioner

Is the feature not

available for present

product?

Fault confirmation

Explain product

features to user

For example: no cooling, etc.

13) Troubleshooting (before replacement of PCB)

Service call

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