Samsung AVMKH020EA0 Service Manual page 264

Is the resistance value
between the compressor
terminals normal?
Yes
Error reset(KEY 3)
Test operation for every room
(KEY 4)
Is high/low pressure normal?
No
Is the compressor operating?
Yes
Even though the compressor is operating
but if there is no response on the
temperature and pressure, it is the loading
failure. Replace the PWM valve.
I Precautions
I
1. The replacement of PWM valve due to the loading failure is the difficult work to abolish the refrigerant in the system and
recharging it, and there is little possibility to appear actually.
So, check the above check items carefully.
I
2. The restart after OLP trip is possible only when the inside temperature of compressor is down lower than 60˚C, and
therefore it takes about 2-3 hours.
I
3. If waiting at the state that the power is on during the temperature failing down.
CCH(Crank case heater) operates to delay the time to restart. Accordingly, separate the connecter to the CCH to block
the power and reconnect the connecter after the completion of final check.
If any one of the resistance value of compressor
No terminals L1(R)-L2(S), L2(S)-L3(T), L3(T)-L1(R) is
not normal, it shall be regarded as OLP Trip. Wait
until the compressor is cooled to restart.
If the compressor is under normal operation,
Yes
check the causes of OLP trip(amount of
refrigerant, outdoor ventilation, etc).
Even though ON signal is going to
compressor but if it is not operated, it is the
No
OLP trip due to the overload. Wait until the
compressor is cooled to restart.
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Troubleshooting