Mitsubishi Heavy Industries FDT90VNPWVH Service Manual page 78

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 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 "
If the breaker ON/OFF is repeated in a short period of time (within 1 minute), "
breaker off and wait for 3 minutes.
LED Green Red
Indoor Keeps flashing Stays OFF
5. Troubleshooting
Diagnosis
The remote control LCD
displays " "
WAIT
2 minutes after the power on.
Isn't blown
the power source fuse (20A) on the outdoor
unit control?
YES
Is AC220-240V
detected at the secondary side of
outdoor unit 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 2/N -
on the outdoor unit terminal
block?
YES
Is approx.
DC20V detected between -
on the indoor unit terminal
block?
77
-
Content
Communication error at
initial operation (1/3)
Turn the breaker off once and then
back on again 3 minutes later.
Is normal condition restored?
NO
Replace the
NO
power supply fuse.
See next page.
NO
NO
NO
NO
NO
YES
"
may be displayed. In such occasion, turn the
WAIT
-
'19 • PAC-SM-334
Countermeasure
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.
"
if the anomaly continues.
WAIT