Mitsubishi SRK25ZD-S User Manual

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Serial signal transmission error
[Wiring error including power cable, defective indoor/
outdoor unit PCB, error on power supply system]
Does error persist after power
reset?
Is there any wrong connection on
indoor/outdoor unit wiring?
Is DC 0~Approx. 12V detected
between 2~3 terminals on
indoor unit terminal block?
YES
YES
NO
NO
YES
NO
Trouble by transient cause, not unit trouble.
Correct improper wire connection on indoor/
outdoor unit.
Defective indoor unit PCB
YES
YES
YES
NO
NO
NO
Is DC 0~Approx. 12V detected
between2~3 terminals on
outdoor unit terminal block?
Is AC 220/230/240V applied
between 1~2 on the outdoor side
terminal block?
Defective indoor unit PCB. Check crossover wires.
Is there any problem on the power
supply line (fuse, reactor,
capacitor, etc.)?
Replace fuse, reactor or capacitor.
Defective outdoor unit PCB
Check crossover wires.
Indoor fan motor error
[Defective fan motor,
defective PCB]
YES
YES
NO
NO
Is connector connection good?
Is voltage applied to fan motor?
Defective fan motor
Correct connector
connection.
Defective indoor unit
PCB
Rotor lock
[Compressor defect, outdoor
unit circuit defect]
NO
YES
¡ Check compressor wiring visually.
¡ Check insulation resistance. (1 MΩ or over)
¡ Check coil wire resistance. (Few Ω)
Is output voltage applied to all 3
phases of power transistor?
Inspect compressor.
Defective inverter
If check results are normal,
compressor is locked.

Mitsubishi SRK25ZD-S Specifications

General

Brand	Mitsubishi
Model	SRK25ZD-S
Category	Air Conditioner
Language	English