Current Cut - Mitsubishi Heavy Industries SRK20HD-S Technical Manual

Current cut

Is there any shortcircuit?
Outdoor unit abnormal
Is the refrigerant level proper?
Is the wiring to the compressor
connected securely?
Check the compressor.
(Disconnection of coil windings)
Compressor overheat
Is Discharge pipe thermistor
resistance value good?
Is sufficient quantity of refrigerant
circulated?
Indoor fan motor error
Is connector connection good?
Is voltage applied to fan motor?
Is the service valve open?
YES
YES
Inspect compressor.
Overload operation?
YES
YES
YES
YES
YES
Defective inverter
YES
YES
Defective fan motor
NO
Service valve opened.
NO
Secure space for suction
and blow out.
¡ Check compressor wiring visually.
¡ Check insulation resistance. (1 MΩ or over)
¡ Check coil wire resistance. (Few Ω)
NO
Short circuit, Check if the heat
exchanger is dirty, stopped up, etc.
NO
Adjust the level to the proper level.
NO
Connect it securely.
Connector connection check, resistance
NO
value check, replacement of Discharge pipe
thermistor
NO
Does trouble persist after
charging gas?
YES
Clogged capillary tube,
etc.
NO
Correct connector
connection.
NO
Defective indoor unit
PCB
35
- -
[compressor lock]
If check results are normal,
compressor is locked.
[Compressor faulty, compressor
wiring disconnected.]
[Gas shortage, defective discharge
pipe thermistor]
NO
Gas shortage
[Defective fan motor,
defective PCB]