Haier H-MRV Series Service Manual page 172

2. Sensor failure
Is sensor properly connected?
yes
Are resistance and
temperature characteristics of
sensor normal?
yes
check if PCB is defective, if
yes,replace
3.EEPROM failure: outdoor displays 10
start
Is EEPROM in mainboard
inversely connected or in
poor contact?
replace PCB
4. Over current protection: 6 flashes of outdoor ALARM lamp, fault readout: 6
Is supply voltage good? Is
wire specification correct?
yes
no
Are connectors in
good condition?
yes
Check if the compressor current
is over protection value: 30A
yes
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?
yes
Is pressure acceptable?
yes
Is compressor in good condition?
yes
Is rectifier in good condition?
yes
Is electrolytic capacitor
for filtration in good
condition?
yes
Check mainboard and make
necessary replacement
no
reconnect
no
change sensor
no
re-set
no
Modify power supply circuit
Check and reconnect
yes
no
Is filter board in good
condition?
no
Change filter board
no
Replace power module
Check: 1. Is a valve in system close?
2. Is piping clogged;
3. Is system overfed; is there air in system;
no
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?
no
Is compressor winding resistance
acceptable? Is it stuck?
1. Check diode characteristics of rectifier+, AC; - AC
no
2. Measure voltage between P and N, which should
be 310VDC at 220VAC
Check capacitance and
no
conductivity and make
necessary replacement
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Change PCB
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