Troubleshooting SiBE12-908
133 Service Diagnosis
2.17 OL Activation (Compressor Overload)
Remote
Controller
Display
E5
Method of
Malfunction
Detection
A compressor overload is detected through compressor OL.
Malfunction
Decision
Conditions
If the compressor OL is activated twice, the system is shut down.
The error counter resets itself if this or any other error does not occur during the following
60-minute compressor running time (total time).
∗
The operating temperature condition is not specified.
Supposed
Causes
Refrigerant shortage
Four way valve malfunctioning
Outdoor unit PCB defective
Water mixed in the local piping
Electronic expansion valve defective
Stop valve defective
Troubleshooting
Check No.02
Refer to P.169
Check No.12
Refer to P.172
Check No.17
Refer to P.176
Check No.31
Refer to P.180
(R9438)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Discharge pipe
thermistor
disconnected?
Insert the thermistor in
position.
NO
YES
Check the thermistors.
Check No. 02
Malfunctioning
∗
Discharge pipe thermistor
Functioning
Check No. 17
Check the electronic
expansion valve.
Functioning
Functioning
Functioning
Check No. 31
Check the four way
valve.
Check No. 12
Check the refrigerant
line.
Malfunctioning
Malfunctioning
Malfunctioning
∗
Refrigerant shortage
∗
Water mixed
∗
Stop valve defective
Replace the discharge pipe
thermistor.
Replace the valve itself or
the coil.
Replace the four way valve
coil or the valve itself.
Replace the outdoor unit
PCB.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
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