Service manual

Troubleshooting - Outdoor Unit Related SiE18-201
226 Service Diagnosis
3.3.15 Faulty heat exchanger thermistor
Outdoor Unit
Indication
J6
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
When the heat exchanger temperature sensor became short-circuited or open.
Supposed
Causes
 Faulty heat exchanger temperature sensor
 Faulty connectors connection of heat exchanger temperature sensor
Troubleshooting
AB
1 -10˚C 117kΩ
2 0˚C 67kΩ
3 10˚C 40kΩ
4 20˚C 25kΩ
5 30˚C 16kΩ
6 40˚C 10kΩ
7 50˚C 7kΩ
8 60˚C 5kΩ
9 70˚C 3kΩ
Disconnect the thermistor
connectors from outdoor unit
PC board and measure the
resistance of heat exchanger
temperature sensor.
Replace thermistor or
thermistor assembly.
If insufficient contact is not
detected, replace outdoor
unit PC board.
YES
Is the resistance
normal referring to the
table below?
NO
(MF034)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.