Service Manual

SiUS181631EA Troubleshooting for Outdoor Unit
Troubleshooting 235
7.7 Discharge Pipe Temperature Abnormality
Error Code
F3
Method of Error
Detection
The temperature detected by the discharge pipe thermistor determines the error.
Error Decision
Conditions

When the discharge pipe temperature rises to an abnormally high level (135 °C (275°F) and
above)

When the discharge pipe temperature rises suddenly (120 °C (248°F) and above for 10
successive minutes)
Supposed
Causes

Defective discharge pipe thermistor

Disconnection of discharge pipe thermistor (R2T)

Defective main PCB (A1P)
Troubleshooting
Check No.33
Refer to P.266
∗
1: Refer to Thermistor Resistance/Temperature Characteristics table 2 on page 268.
∗
2: Compare the resistance value of discharge pipe thermistor and the value based on the surface
thermometer.
NO
NO
Replace the discharge pipe
thermistor (R2T).
Replace the main PCB (A1P).
YES
YES
· Discharge pipe thermistor is normal and the
temperature detection of the main PCB (A1P) is
also normal.
· Actually the temperature of discharge pipe is high.
Check No.33 Remove the factor of overheat
operation.
Service Checker
Connect the service checker to compare the
temperature of discharge pipe by using service
checker with actual measurement value of discharge
pipe thermistor. (See ∗2)
Connect the service checker.
Press reset and start operation
again.
(R23968)
Is the
temperature
of discharge pipe
by using service
checker the same with
actual measurement
value of discharge
pipe
thermistor?
Is the discharge pipe
thermistor normal?
(See∗1)
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.