Alarm code
20
Abnormality of Thermistor for Discharge Gas Temperature (Compressor Thermistor)
• 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 thermistor is short-circuited (less than 1 kΩ) or cut (greater than 6 MΩ) during
the cooling or heating operation.
Phenomenon
Cause Check item
Action
(Turn OFF Main Switch)
Faulty top of compressor thermistor
Fault Check resistance Replace thermistor if faulty
Incorrect connection Check wiring to PCB1 Repair wiring and connections
Faulty PCB1 Replace PCB1 and check operation Replace PCB1 if faulty
The resistance value have fudge factor (+10%).
8 Troubleshooting
243
SMGB0060 rev. 1- 12/2010
8
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