Self Diagnosis Indicating Function (Indoor Unit); How To Count The Number Of Blinking Of The Lamp - Hitachi RAF-50FX8 Service Manual

Self Diagnosis Indicating Function (Indoor Unit)

If the "Timer Lamp" of the indoor unit blinks, repair the malfunction referring to the table below.

1. How to count the number of blinking of the lamp

Blinking is repeated with intervals of 2 seconds.
Blinking speed is: Lit 0.35 second/OFF 0.35 second.
2. When trying to restart the unit while the lamp is blinking, press the "START/STOP" button on the remote controller for 2
times. The first press turns the microcomputer to the resetting state. Then the second press starts the unit.
<Note>
(1) When the indoor unit does not work at all, check if there is an incorrect wire connection or breaking of the wire on F cable.
(2) When the interface circuit is at fault from the time the power is switched ON, no indication by lamp blinking is made on the
indoor unit. To diagnose the interface circuit, use the self diagnosis function for the communication circuit or the self diagnosis
memory function.
(3) "Outdoor unit forced operation" is not stored in the self diagnosis memory.
Blinking Number
lamp of blinking
Malfunction of reversing valve
1
2
Outdoor unit forced operation
3
Indoor/outdoor unit interface defective
4 Outdoor defective indication
9
Abnormality on indoor unit sensor
10
Abnormality on DC fan motor rotation
13
IC401 defective
Self diagnosis
Heat exchange temperature of the indoor unit during heating
operation is too low, or heat exchange temperature of the indoor unit
during cooling operation is too high.
The unit is in operation using the service switch on the outdoor unit.
Communication from the outdoor unit was interrupted.
Outdoor unit electrical components defective.
Wire breakage or short circuit occurred on the indoor thermistor.
An upper indoor fan motor is locked.
Indoor unit EEPROM cannot be read.
[Example of 5 times blinks]
2 sec. rest
Reason for the detection of malfunction
– 186 –
2 sec. rest
Remarks