>a__WcU[S^ <[c >a`V[e[a`Wc
no
replace PCB
start
re-set
3.EEPROM failure
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
Is EEPROM in mainboard
inversely connected or in
poor contact?
no
check and reconnect
Is pressure acceptable?
check if running current is above 23A?
4. Over current protection: 6 flashes of outdoor ALARM lamp
yes
Modify power supply circuit
Replace power module
Is supply voltage good? Is
wire specification correct?
no
no
no
yes
yes
yes
no
no
Are connectors in
good condition?
replace
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?
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
yes
yes
yes
Is compressor in good
condition?
Is rectifier in good condition?
Is electrolytic capacitor
for filtration in good
condition?
Check mainboard and make
necessary replacement
no
no
no
Is compressor winding resistance
acceptable? Is it blocked?
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
-165-
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