Is
AC220/240V
detected between and
on the terminal block
of indoor
unit?
NO
NO
Are fuses
OK (F200, F201)?
YES
YES
NO
Is the
check of resistance between
- of CNW0
OK?
NO
Is the
checked result
of resistance of FM,
LM, etc
OK?
NO
Is
AC220/240V
for 1-phase unit detected between
and on the terminal
block of outdoor
unit?
YES
YES
Is AC19V or
higher detected between Red-
Red (CNW2) at transformer
secondary side?
YES
YES
NO
(3)
FDTC, FDUM
Series
FDEN,
Series
Note (3) for GND
NO
NO
Is DC5V detected
between - of CNW2
(FDUM:CNW1)?
NO
YES
YES
Is JX1 open?
Is JX1 open?
YES
Defective outdoor control
PCB (Noise lter)
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.
2. Error detection method
3.
Condition of Error displayed
4. Presumable cause
• Misconnection or breakage of
connecting wires
• Blown fuse
• Faulty indoor control or
power PCB
• Broken harness
• Faulty outdoor control PCB
(Noise filter)
Note: