check fan motor and capacitor
Note: The protection is activated when temperature is higher than 120° C and restored when lower than 100° C.
Conduct leak test.
Evacuate and recharge
yes
Measure equalized pressure and
running pressure to see if the
system is overfed or starved. Is
there a leak? Is capillary tube
clogged?
no
repair or replace
yes
Is piping twisted or
deformed?
no
cleaning
Is filter or heat exchanger dirty?
yes
yes
no
no
Does indoor fan motor work properly in
heating cycle? Does outdoor fan motor
work properly in cooling cycle?
replace PCB
Air conditioner is
running in bad
condition?
Unclog piping
If the pipe is
blocked?
Are they too low?
Are high pressure and
low pressure normal?
replace PCB
yes
yes
yes
yes
yes
yes
nono
no
Is discharging temperature
sensor in good condition?
no
Is discharging temperature detected
by a thermometer too high?
open valves
no
Are stop valves in suction pipe and
liquid pipe of outdoor unit open?
Refrigerant charge is needed
start
replace discharging sensor
1) Compressor discharging temperature protection
yes
Troubleshooting
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