Trouble Shooting - Hitachi RAI-ECPM Service Manual

TROUBLESHOOTING WHEN TIMER LAMP BLINKS.
Model RAI-25NH5A, RAI-35NH5A, RAI-50NH5A
Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink.
SELF-DIAGNOSIS LIGHTING MODE
Model: RAI-25NH5A, RAI-35NH5A,RAI-50NH5A
No. Timer indicator flashing mode
1
– – – – – – – –
2sec.
2 – – – – – – – Twice
2sec.
3
2sec.
4 2sec.
5
2sec.
6
2sec.
7
2sec.
8
2sec.
9
1
2sec.
( – – Lights for 0.35 sec. at interval of 0.35 sec..)
5
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 F-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
Four-way valve faulty
The room heat exchange
temperature is low during heating,
Once
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
– – – – – – 3 times
outdoor unit has been interrupted.
Outdoor electrical assembly
defective.
– – 4 times
Abnormal water level detection
All stop when the float switch has
– – 6 times
been activated.
Drain pump forced operation.
When the knob of drain pump test
– – 7 times
switch at Indoor P.W.B main slide to
'test' position.
Room thermistor or heat
exchanger thermistor is faulty
– – 9 times When room thermistor or heat
exchanger thermistor is opened
circuit or short circuit.
DC fan motor overcurrent detection
– – 10 times
Overcurrent in indoor DC fan motor
has been detected.
IC401 data reading fault
– – 13 times There was error in the data read
from IC401
1).
Reason for display
– 61 –
Section of estimated fault
(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