Hitachi RAS-18LH2 Service Manual page 57

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
– – – – – – – – 1 time
1
– – – – – – – 2 times
2
3
4
5
6
( – – 0.5 second on, 0.5 second off.)
!
4-way valve not working
Inside temperature is low in
heating operation time or inside
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 fl ow of
electricity
– – – 10 times Indoor - DC Fan motor has over
fl ow 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
– 62 –
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.