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Only for training and service purposes
■ Troubleshooting Guide(9,12kBtu/h Model)
Part 4 Trouble Shooting
Description Cause of error
1
• Indoor thermistor (sensor) is short or open
•
Indoor thermistor (sensor) is not connected to the indoor pcb assembly
• Damage or defect on the sensing circuit of indoor pcb assembly.
(R01H, R02H, R03H, R04H, C01H, C02H)
Indoor thermistor is short
or open
Indoor thermistor is connected
to Indoor pcb
assembly ?
Indoor thermistor is right ?
YES
No
- Connect to CN-TH1 in
indoor pcb
assembly
Sensing circuit of indoor
pcb
is right ?
No
Check Indoor thermistor
-
Measure resistance of thermistor
(air : about 10kΩ at 25°C(77°F),
pipe : about 5kΩ at 25°C(77°F)
YES
No
- Check soldering state of
R01H ~ R04H, C01H, C02H
Check flow
2
• Outdoor thermistor (sensor) is short or open
•
Outdoor thermistor (sensor) is not connected to the outdoor pcb assembly
• Damage or defect on the sensing circuit of outdoor pcb assembly.
(R03H~R06H, C02H, C03H)
Outdoor thermistor is
short or open
Description
Error code
Error code
Cause of error
Outdoor thermistor is connected
to outdoor pcb assembly ?
Outdoor thermistor is right ?
YES
No
- Connect to CN-TH1 in
outdoor pcb assembly
Sensing circuit of outdoor
pcb
is right ?
No
Check outdoor thermistor
-
Measure resistance of thermistor
YES
No
- Check soldering state of
R03H ~ R06H, C02H, C03H
Check flow
(air : about 10kΩ at 25°C(77°F),
pipe : about 5kΩ at 25°C(77°F)