Hitachi RAS-18CH7 Service Manual page 60

Timer-Lamp, break-down checking in blinking sign.
Check the break-down factor from the frequency of timer-lamp blinking.
No. Mode of Timer-Lamp blinking
5
– – – – – – – – 1 time
1
sec.
5
– – – – – – – 2 times
2
sec.
5
3
sec.
5
4
sec.
5
5
sec.
5
6
sec.
( – – 0.5 second on, 0.5 second off.)
CAUTION
!
Remote control is disabled while the Timer lamp is flashing.
To check operation, turn off the power switch and turn it on again.
4-way valve not working
Inside temperature is low in heating
operation
temperature is high in cooling
operation time.
Force cooling operation
Unit is under forcible operation or
under balancing after forcible
operation.
DC Fan motor - over flow of
electricity
– – – 10 times Indoor - DC Fan motor has over
flow of electricity.
IC 401 Data read wrongly
In case that data read from IC401
– – – 13 times
is wrong.
Heat exchanger thermistor
error
– – – 14 times
Heat exchanger thermistor open
or short-circuit detected.
Room thermistor error
Room thermistor error open or
– – – – 15 times short-circuit detected.
Indication Factor
time or inside
– 64 –
Estimated Break-Down Part
(1) 4-way valve is not working.
(2) Heat-exchanger thermistor is
in disconnection.
(Only heating time)
Check force cooling switch at
indoor electrical.
(1) Indoor - Fan is locked.
(2) Indoor - Fan motor damage.
(3) Indoor - control circuit board.
IC401 data is not in order.
(1) Thermistor
(2) Indoor - control circuit board.
(1) Thermistor
(2) Indoor - control circuit board.