Si04-115
Trouble shooting
Service Diagnosis
75
5.10
Operation Halt Due to Thermistor Error or Disconnection
Detection
Remote
Controller
Display
J3,
J3,
J3,
J3, J6,
J6,
J6,
J6, H9
H9
H9
H9
Outdoor unit LED
Display
A
5
Method of
Malfunction
Detection
Thermistor errors are detected using thermistor input voltage to micro computer. (Thermistor
errors are detected using the temperatures detected by the thermistors.)
Malfunction
Decision
Conditions
When the thermistor input during compressor operation is more than 4.96 V or less than 0.04 V.
∗
Value changes depends on models
Supposed
Causes
"
Faulty connector connection
"
Faulty thermistor
"
Faulty PCB
Troubleshooting
Check No.5
Refer to P.88
J3
: Discharge pipe thermistor
J6
: Outdoor unit heat exchanger thermistor
H9
: Outside air thermistor
Correct the connection.
Replace the thermistor.
Replace the outdoor unit P.C.B.
Is it normal?
Check No. 5
Thermistor resistance check
Check the connector connection.
YES
YES
Is it normal?
NO
NO
(R1952)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
