Specifications

Troubleshooting by Remote Controller SiBE341027
150 Service Diagnosis
Troubleshooting
Note:
*1. Check the low pressure value by using pressure gauge in operation.
*2. Compare the actual measurement value by pressure sensor with the value by the pressure
gauge.
*3. Compare the thermistor resistance value with the value on the surface thermometer.
Refer to P.180
Refer to P.181
Is the temperature
difference between the
suction pipe and the
heat exchanger 20 ˚C
or more?
Are the property of suction pipe
thermistor (R8T) and heat
exchanger thermistor (R9T)
normal? (*3)
Is the low pressure
0.1MPa or less? (*1)
Is the
characteristics of
low pressure
sensor normal?
(*2)
Replace the low pressure
sensor.
Replace the outdoor unit
main PCB (A1P).
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
NONO
YES YES
YES
Remove the factor of
decreasing low pressure.
CHECK 2
Remove the factor of
superheating.
CHECK 3
Replace the thermistor.
Replace the outdoor unit main
PCB (A1P).
NONO
YES
In heating
In cooling

Mount a pressure gauge at the service port on the low
pressure side.

Reset the operation using the remote controller then restart.
Reset the operation using the remote controller then restart.
CHECK 2
CHECK 3