Mitsubishi FDT125VNPWVH - Page 67

Communication error at
initial operation (1/3)
1. Applicable model
5. Troubleshooting
All models
When the remote control LCD
displays “
WAIT
” 2
minutes after the power on.
Diagnosis Countermeasure
Replace the
power source fuse.
See next page.
NO
The remote control LCD
displays “ ”
2 minutes after the power on.
Turn the breaker off once and then
back on again 3 minutes later.
Is normal condition restored?
NO
NO
NO
Is blown
the power source fuse (20A) on the outdoor
unit control?
Is AC220-240V
detected at the secondary side of
outdoor unit PCB?
Is the
green LED of indoor unit
flashing?
Are wires
connected properly between
the indoor and the outdoor
units?
Is approx.
DC20V detected between 2/N-
➂ on the outdoor unit terminal
block?
NO
Is approx.
DC20V detected between
➁-➂
on the indoor unit terminal
block?
NO
YES
WAIT
YES
YES
YES
YES
YES
YES
NO
Normal
Defective outdoor unit
PCB
→
Replace.
Defective indoor unit
control PCB
→
Replace.
Replace indoor unit control
PCB.
Correct connection wires
between indoor and
outdoor units.
Defective outdoor unit
PCB
→
Replace.
Defective connection wire
(broken wire)
Noise
Defective indoor unit
control PCB
→
Replace.
2. Error detection method
3 .
Condition of error displayed
4. Presumable cause
• Blown fuse
• Faulty outdoor unit PCB
• Connection between PCB’s
• Faulty indoor unit 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 “
WAIT
”
if the anomaly
continues. If the breaker ON/OFF is repeated in a short period of time (within 1 minute), “
WAIT
”
may be displayed. In such occasion,
turn the breaker o and wait for 3 minutes.
Error code
Remote control:
LED Green Red
Indoor
Stays OFF Keeps flashing
Content
WAIT
'22 • PAC-SM-412
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