Power Supply System Error (Power Supply To Indoor Control Pcb); Power Supply System Error (Power Supply To Remote Control) - Mitsubishi Heavy Industries SRR25ZJ-S Technical Manual

Error code
Remote control: None
1. Applicable model
All models
2. Error detection method
3. Condition of Error displayed
4. Presumable cause
• Misconnection or breakage of
connecting wires
• Blown fuse
• Faulty indoor control or
power PCB
• Broken harness
• Faulty outdoor control PCB
(Noise filter)
Note:
LED Green Red
(Power supply to indoor control PCB)
Indoor Stays OFF Stays OFF
5. Troubleshooting
Diagnosis
Is
AC220/230/240V
detected between � and
� on the terminal block
of indoor
unit?
YES
for 1-phase unit detected between
� and � on the terminal
Are fuses
OK (F200, F201)?
YES
check of resistance between
(1)
Is DC5V
detected between �-�
of CNW2?
Note (1) � for GND
YES
Is JX1 open?
113
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Content Power supply system error
NO
Is
AC220/230/240V
NO
block of outdoor
unit?
YES
NO
Is the
NO
�, � of CNW0
OK?
YES
Is the
checked result
NO
of resistance of FM,
LM, etc
OK?
YES
NO
NO
YES
-
'14 • SR-T-157
Countermeasure
Defective outdoor control
PCB (Noise filter)
Misconnection or breakage
of connecting wires
Defective indoor control or
power PCB ➞ Replace.
Replace FM, LM, etc.
Replace fuse.
Defective indoor power
PCB ➞ Replace.
Open JX1.
Defective indoor control
PCB ➞ Replace.