Hitachi RWM-(H)FSN3E, Service Manual

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12 Troubleshooting
SMGB0070 rev. 1 - 08/2011
370
Alarm code
41
Cooling overload (high pressure switch will be activated) (RAS-(3-10)H(V)RNME-AF)
• The RUN LED flickers and “ALARM” is displayed on the remote control switch.
•
The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit
number and the alarm code are displayed on the display of the outdoor unit PCB.
- This alarm code is indicated when the protection device is activated at following condition. Evaporation tempera-
ture of outdoor unit higher than 55 degree and top of compressor temperature higher than 95 degree.
No
Faulty PCB1
Yes
Is CMC ON?
Is the
voltage bet-
ween PCN9#1 and #3
220V/240V?
Is protection
device
activated?
No No
Is CMC ON
> 3 seconds?
Yes
Faulty PCB1
Yes
Check the temperature of the following places with the remote
control switch in checking mode.
Check the temperature of [1]
compressor top temperature and
[2] outdoor unit evaporation (piping). Examine the cause and
address the problem if the measurements surpass the preset
temperature:
1 Compressor top temperature: 95ºC or less
2
Outdoor unit evaporation (piping) temperature: 55ºC or less
Yes
No
90
80
70
60
50
40
30
20
10
0
-15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60
Thermistor characteristics
Ambient Temperature (ºC)
Thermistor
resistance
(kΩ)