Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 254

Error code
Remote control:
WAIT
1. Applicable model
All models
When the remote control
display is extinguished after the
power on.
2. Error detection method
3. Condition of error displayed
4. Presumable cause
• Blown fuse
• Connection between PCB's
• Blown fuse
• Faulty indoor control PCB
• Defective remote control
• Wire breakage on remote
control
• Faulty outdoor sub PCB
Note:
LED Green Red
Indoor Keeps flashing Stays OFF
– Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
Remote control display is
extinguished after the power on.
Is the
green LED on the indoor unit
flashing?
YES
Are wires
connected properly between the indoor and
the outdoor units?
YES
Is approx.
DC20V detected between -Ž
on the outdoor unit terminal
block?
YES
Is approx
DC20V detected between -Ž
on the indoor unit terminal
block?
253
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Content
Communication error at
initial operation (3/3)
NO
Is the
fuse on the indoor control
PCB OK?
YES
(1)
Is AC
19V or higher detected
between Red-Red at the secondary side of
indoor unit transformer?
YES Note (1) FDEN only.
Is
approx. DC10-11V detected
between wires at the remote control
side after disconnecting the
remote control?
YES
NO
NO
NO
YES
-
'17 • SCM-T-225
Countermeasure
Replace fuse.
NO
Defective transformer
NO
Short-circuit on remote
NO
control wire
Defective remote control
Correct wires.
Defective outdoor sub
PCB ➞ Replace.
Defective connection wire
(Broken wire)
Noise
Defective indoor control
PCB ➞ Replace.