Hitachi RAC-70DH7 - Troubleshooting When Timer Lamp Blinks

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‚O‚O‚T‚P‚Q‚S‚`
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‚a
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TIMER LAMP
(LED6-GREEN)
TROUBLESHOOTING WHEN TIMER LAMP BLINKS
Model RAD-50DH7A, RAD-60DH7A, RAD-70DH7A
Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink.
SELF-DIAGNOSIS LIGHTING MODE
Model: RAD-50DH7A, RAD-60DH7A, RAD-70DH7A
<Remark>
If using wired remote controller, electrical cover have to be opened so that timer lamp at indoor p.w.b can be seen
as Fig. 1.
If using wireless remote controller (optional part), no need to open electrical cover. Refer the timer lamp at panel-as
(Fig. 2).
No. Timer indicator flashing mode Reason for display Section of estimated fault
Four-way valve faulty
The room heat exchange temperature is low
during heating, or it is high during cooling.
Outdoor unit forced operation
The outdoor unit is in forced operation or
undergoing balancing after forced operation.
Indoor/outdoor interface faulty
The interface signal from the outdoor unit has
been interrupted.
Outdoor electrical assembly defective.
Abnormal water level detection
All stop when the float switch has been activated.
Drain pump forced operation.
When the knob of drain pump test switch at
Indoor P.W.B main slide to ‘test’ position.
Room thermistor or heat exchanger
thermistor is faulty
When room thermistor or heat exchanger
thermistor is opened circuit or short circuit.
DC fan motor overcurrent detection
Overcurrent in indoor DC fan motor has been
detected.
IC401 data reading fault
There was error in the data read from IC401
(1) Four-way valve faulty.
(2) Disconnection in heat exchange
thermistor (only during heating)
Service SW in outdoor electrical parts
turned ON.
(1) Indoor interface circuit
(2) Outdoor interface circuit
Please check at the outdoor electrical
led lamp blinking (LD301) and refer to
self diagnosis lighting mode for outdoor
unit.
(1) Drain stopped up
(2) Drain pump
(3) Float switch
(1) Indoor P.W.B. Main.
(1) Room thermistor
(2) Heat exchanger thermistor
(1) Indoor fan locked
(2) Indoor fan motor
(3) Indoor P.W.B. Main
IC401 faulty
1
2
3
4
5
6
7
8
9
( –– Lights for 0.35 sec. at interval of 0.35 sec..)
–– 7 times
– ––––– 3 times
– ––––––– Once
– –––––– Twice
–– 9 times
1
–– 6 times
–– 4 times
–– 10 times
–– 13 times
2 sec.
2 sec.
2 sec.
2 sec.
2 sec.
2 sec.
2 sec.
2 sec.
2 sec.
2 sec.
<Cautions>
(1) If the interface circuit is faulty when power is supplied, the self-diagnosis display will not be displayed.
(2) If the indoor unit does not operate at all, check to see if the connecting cable is connected or disconnected.
(3) To check operation again when the timer lamp is blinking, you can use the remote control for operation (except for
mode mark
1).
PANEL-AS
TIMER LAMP
Fig. 1 Fig. 2