Checking code Meaning, detecting method Cause Checking method & Countermeasure
Power supply
sync signal
trouble
Fan speed
trouble (motor
trouble)
Check before the breaker, after the
breaker or at the power supply ter-
minal blocks TB1 or TB1A, and if
there is an open phase, correct the
connections.
If the power supply voltage wave-
form is distorted from a sine wave,
improve the power supply environ-
ment.
If F1, F2 or F3 on the MAIN board,
or F3 is melted, (Resistance
between both ends of the fuse is ∞),
replace the fuses.
If none of the items in 1) to 3) is ap-
plicable, and if the trouble reap-
pears even after the power is
switched on again, replace the
MAIN board (when replacing the cir-
cuit board, be sure to connect all the
connectors, ground wires, etc. se-
curely).
•Confirm slipping off of connector
(CN33) on indoor controller
board.
•Confirm slipping off of connector
(FAN1) on indoor power board.
•Check wiring for disconnection.
•Check filter.
•Check indoor fan motor.
•When aboves have no trouble.
1) For trouble after operating fan.
Replace indoor controller board.
If not remedied, replace indoor
power board.
2) For trouble without operating fan.
Replace indoor power board.
4115
4116
1) There is an open phase in the
power supply (R, S, T)
2) The power supply voltage is dis-
torted.
3) A fuse is defective.
4) The circuit board is defective.
1) Slipping off of fan speed detecting
connector (CN33) of indoor control-
ler board
2) Slipping off of fan output connector
(FAN1) of indoor power board
3) Disconnection of fan speed detect-
ing connector (CN33) of indoor
controller board, or that of fan out-
put connector (FAN1) of indoor
powr board.
4) Filter cologging
5) Trouble of indoor fan motor
6) Faulty fan speed detecting circuit of
indoor controller board, or faulty fan
output circuit of indoor power
board.
The frequency cannot be deter-
mined when the power is
switched on.
(The power supply’s frequency
cannot be detected. The out-
door fan cannot be controlled
by phase control.)
(Detects only for PKFY-NAM)
1. Detecting fan speed below
180rpm or over 2000rpm
during fan operation at in-
door unit (first detection) en-
ters into the 3-minute restart
prevention mode to stop fan
for 30 seconds.
2. When detecting fan speed
below 180rpm or over
2000rpm again at fan return-
ing after 30 seconsd from
fan stopping, error stop (fan
also stops) will be com-
menced displaying 4116.
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