Service Manual

8. Troubleshooting
229
SMGB0079 rev.0 - 01/2013
8
Alarm code
42
Heating Overload (High pressure switch will be activated) for RAS-(2-2.5)HVNP and RAS-3HVNC
• The RUN LED ickers 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.
- Abnormality indication will appear when the protection device is activated during compressor operation at heating
(see Note), with the outdoor unit evaporation temperature higher than 55 °C and the compressor-top temperature
higher than 95 °C.
Outdoor unit evaporation thermistor Top of compressor thermistor
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
74
43
33
26
20
16
12.5
10
8
5.3
3.6
2.5
56
Thermistor
Resistance
(kΩ)
Ambient and Evaporating Temp. Thermistor Characteristics
for Outdoor Unit
Ambient Temperature (
o
C)
Thermistor resistance (kΩ)
Temperature (ºC)
Thermistor resistance characteristics
R25=200kΩ
B=3920K