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