Haier Unitary smart series Service Manual page 185

9) Overcurrent protection for single-phase fixed frequency models- Wired controller shows
Is supply voltage too low? Especially
when compressor starts up?
no
Is supply wire securely
connected?
yes
Is compressor current more than overcurrent
protection limit? Is current detecting circuit in
good condition?
yes
Is compressor in
good condition?
yes
Is running capacitor in
good condition?
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
modify power supply circuit
no
re-wiring
no
Is resistance of compressor
no
winding incorrect? Is it stuck?
no
replace running capacitor
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a__
Confirm detecting circuit
is abnormal,replace
outdoor PCB
yes
replace compressor
^ a` a`
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