Service manual

Troubleshooting - Outdoor Unit Related Si18-201
274 Service Diagnosis
3.3.12 Faulty Outside Air Thermistor
Outdoor Unit
Indication
H9
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
When the outside air temperature sensor became short-circuited or open.
Supposed
Causes
"
Faulty outside air temperature sensor
"
Faulty connectors connection of outside air temperature sensor
Troubleshooting
AB
1-10°C 117k
Ω
20°C67k
Ω
310°C40k
Ω
420°C25k
Ω
530°C16k
Ω
640°C10k
Ω
750°C7k
Ω
860°C5k
Ω
970°C3k
Ω
Disconnect the thermistor
connectors from outdoor unit
PC board and measure the
resistance of suction air
temperature sensor.
Replace thermistor or
thermistor assembly.
If no faulty contact is
generated, replace outdoor
unit PC board.
YES
Is the resistance
normal referring to the
table below?
NO
(MF031)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.