Trouble Shooting When The Timer; Dehumidifying Lamp Blinks - Hitachi RAS-25CNH1 Service Manual

TROUBLE SHOOTING WHEN THE TIMER and DEHUMIDIFYING LAMP BLINKS
MODEL RAS-25CNH11
Perform trouble shooting according to the number of times the timer lamp on the display of the indoorunit blinks
Blinking made of timer lamp
No.
5 sec.
1
5 sec.
2
5 sec.
3
5 sec.
4
5 sec.
5
5 sec.
6
( lights for 0.5 sec. at intervals of 0.5 sec.)
CAUTION
(1) If the interface circuit is defective when the power is turned ON, the self-diagnosis indication is not displayed.
(2) When indoor unit is performing self-diagnosis operation shown above, self-diagnosis lamp of the outdoor unit
blinks 9 times.
(3) If the indoor unit cannot be operated at all, check the connection of the F cable (reverse connection or dis
connection.)
(4) When timer lamp or dehumidifying lamp blinks, remote control can be used to operate for checking operation
once again.
Reason of indication
Reversing valve defective
When the indoor heat exchanger
1 time
temperature is too low in the heating
mode or it is too high in the cooling
mode.
Outdoor unit forced operation
When the outdoor unit is in forced
2 times
operation or balancing operation
after forced operation.
Indoor unit/outdoor unit interface
defective
3 times
When the interface signal from the
outdoor unit is interruppted.
Outdoor unit electrical components
defective
When the same error mode is detected
8 times within 30 minutes from outdoor
4 times
unit electrical components.
(However, when error is detected 8
times within two hours only for outdoor
thermistor.)
Over-current detection at the DC fan
motor
10times
When over-current is detected at the
DC fan motor of the indoor unit.
IC401 data reading error
13 times
When data read from IC401 is
incorrect.
– 95 –
Possible caues
(1) Reversing valve defective
(2) Heat exchanger thermistor
disconnected
(only in the heating mode).
Electrical parts in the outdoor unit.
(1) Indoor unit interface circuit
(2) Outdoor unit interface circuit
(1) Indoor unit fan motor
(2) Outdoor unit electrical
components
(For details, operate again using
remote controller and check from
self-diagnosis display of outdoor
unit.)
(1) Indoor unit fan lock
(2) Indoor unit fan motor
(3) Indoor unit control P.W.B.
IC401 abnormal