Troubleshooting
SiMX042215E
84
Part 6 Service Diagnosis
Reference
4.21 Thermistor or Related Abnormality (Outdoor Unit)
Error Code
H9, J3, J6, P4
Method of Error
Detection
This fault is identified based on the thermistor input voltage to the microcomputer.
A thermistor fault is identified based on the temperature sensed by each thermistor.
Error Decision
Conditions
The voltage between both ends of the thermistor is either 4.96 V or more, or 0.04 V or less
with the power on.
J3
error is judged if the discharge pipe temperature is lower than the heat exchanger
temperature.
Supposed
Causes
Disconnection of the connector for the thermistor
Defective thermistor(s)
Defective outdoor heat exchanger thermistor in the case of
J3
error
Defective outdoor unit PCB
Troubleshooting
In case of P4
Replace the outdoor unit PCB (main PCB).
P4
: Radiation fin thermistor
Troubleshooting
In case of H9, J3, J6
H9
: Outdoor temperature thermistor
J3
: Discharge pipe thermistor
J6
: Outdoor heat exchanger thermistor
Check No.01
Refer to P.90
Caution
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
connectors, or parts may
b
e damaged.
(R20503)
Caution
NO
YES
NO
YES
Turn on the power again.
Normal?
Reconnect the connectors
or thermistors.
Replace the defective
thermistor(s) of the following
thermistors.
Outdoor temperature
thermistor
Discharge pipe thermistor
Outdoor heat exchanger
thermistor
Replace the outdoor unit
PCB (main PCB).
Error displayed
again on remote controller?
Check No. 01
Check the thermistor resistance
value.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
