Haier AB092ACBHA, Service Manual

Page: 308 / 365

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9) Overcurrent protection for single-phase fixed frequency models
Is supply voltage too low? Especially
when compressor starts up?
modify power supply circuit
no
no
re-wiring
yes
Is compressor current more than overcurrent
protection limit? Is current detecting circuit in
good condition?
no
Confirm detecting circuit
is abnormal,replace
outdoor PCB
yes
Is compressor in
good condition?
no
Is resistance of compressor
winding incorrect? Is it stuck?
replace compressor
yes
yes
Is running capacitor in
good condition?
no
replace running capacitor
yes
Is pressure normal?
no
Check: 1. Is a valve in system shut off;
2. Is piping clogged;
3. Is system overfed; is there air in system;
4. (Cooling cycle) Is condenser dirty? Does outdoor fan motor run at low speed or stop?
5. (Heating cycle) Is evaporator or filter dirty? Does indoor fan motor run at low speed or stop?
6. Is ambient temperature too high? Is system overloaded?
yes
Is supply wire securely
connected?
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