Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 52

Error code
Remote controller: 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 transformer
• Faulty indoor control or
power PCB
• Broken harness
• Faulty outdoor control PCB
(Noise filter)
Note:
LED Green Red
Content
Indoor Stays OFF Stays OFF
(Power supply to indoor control PCB)
Outdoor Stays OFF 2 times flash
5. Troubleshooting
Diagnosis
Is
AC220/240V
detected between 1 and
2 on the terminal block
of indoor
unit?
YES
block of outdoor unit or is AC220/240V
Note(1) FDT, FDTC Series: F200, F201
Other than FDT, FDTC: Fuse between wires
(1)
Are fuses OK (2 pcs.)?
YES
FDEN, FDUM,
FDT, FDTC Series
FDU Series
detected between -
Is AC19V or
higher detected between Red-
NO
Red (CNW2) at transformer
secondary side?
YES
Is JX1 open? NO
YES

-
Power supply system error
NO
Is
AC380/415V
for 3-phase unit detected
between 1, 2 and 3 on the teminal
NO
for 1-phase unit detected between
1 and 2 on the terminal
block of outdoor
unit?
YES
NO
(2)
Is the
check of resistance between
NO
- of CNW0
OK?
Note (2) Remove the
transformer for
YES
other than FDT
or FDTC Series.
Is the
(CNW1)
checked result
NO
of resistance of FM,
LM, etc
OK?
YES
(3)
Is DC5V
NO
of CNW2?
Note (3) for GND
YES
NO
Is JX1 open?
YES
-
'10 • PAC-SM-137$
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.
Replace transformer.
Open JX1.
Defective indoor control
PCB Replace.