Si12-411A Troubleshooting
Service Diagnosis 183
5.11 OL Activation (Compressor Overload)
Remote
Controller
Display
E5
Outdoor Unit LED
Display
A
5
1
4
2
1
3
4
4
1
Method of
Malfunction
Detection
A compressor overload is detected through compressor OL.
Malfunction
Decision
Conditions
If the compressor OL is activated twice, the system will be shut down.
The error counter will reset 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
Shut-off valve defective
Troubleshooting
Check No.4
Refer to P.207
Check No.5
Refer to P.208
Check No.6
Refer to P.209
Check No.11
Refer to P.212
Insert the thermistor in
position.
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.
(R2841)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Discharge pipe thermistor
disconnected?
YES
Malfunctioning
∗ Discharge pipe thermistor
NO
Functioning
Functioning
Check No. 11
Check the refrigerant line.
Malfunctioning
∗ Refrigerant shortage
∗ Water mixed
∗ Stop valve defective
Check No. 6
Check the thermistors
Malfunctioning
Functioning
Check No. 4
Check the electronic expantion
valve.
Malfunctioning
Functioning
Check No. 5
Check the four way valve.
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