Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 252

Error code
Remote control:
WAIT
1. Applicable model
All models
When the remote control LCD
displays " " 2
WAIT
minutes after the power on.
2. Error detection method
3. Condition of error displayed
4. Presumable cause
• Blown fuse
• Faulty outdoor sub PCB
• Connection between PCB's
• Faulty indoor control PCB
• Defective remote control
• Broken remote control wire
Note: If any anomaly is detected during communication, the error code E5 is displayed. Inspection procedure is same as above. (Excluding
matters related to connection) When the power source is reset after the occurrence of E5, the LED will display "
continues. If the breaker ON/OFF is repeated in a short period of time (within 1 minute), "
turn the breaker off and wait for 3 minutes.
LED Green Red
Indoor Keeps flashing Stays OFF
– Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
The remote control LCD
displays " "
WAIT
2 minutes after the power on.
Turn the breaker off once and then
back on again 3 minutes later.
Is normal condition restored?
NO
Isn't blown
the power source fuse (15A, 20A or 30A) on the
outdoor unit control?
YES
Is AC220/240V
detected at the secondary side of
outdoor sub PCB?
YES
Is the
green LED of 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?
251
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Content
Communication error at
initial operation (1/3)
YES
Replace the
NO
power source fuse.
To next page
NO
NO
NO
NO
NO
YES
WAIT
-
'17 • SCM-T-225
Countermeasure
Normal
Defective outdoor sub
PCB → Replace.
Defective indoor control
PCB → Replace.
Replace indoor control
PCB.
Correct connection wires
between indoor and
outdoor units.
Defective outdoor sub
PCB → Replace.
Defective connection wire
(broken wire)
Noise
Defective indoor control
PCB → Replace.
"
if the anomaly
WAIT
"
may be displayed. In such occasion,