Service Manual

Troubleshooting SiUS091133
115 Service Diagnosis
4.12 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 error repeats, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
 The operating temperature condition is not specified.
Supposed
Causes
 Defective discharge pipe thermistor
 Defective electronic expansion valve or coil
 Defective FourWay valve or coil
 Defective outdoor unit PCB
 Refrigerant shortage
 Water mixed in refrigerant
 Defective stop valve
Troubleshooting
Check No.01
Refer to P.142
Check No.12
Refer to P.144
Check No.13
Refer to P.145
Check No.14
Refer to P.145
(R14438)
Caution
YES
NG
* Discharge pipe thermistor
NO
OK
OK
NG
NG
OK
NG
OK
* Refrigerant shortage
* Water mixed
* Stop valve
Insert the thermistor in
position.
Replace the discharge pipe
thermistor.
Replace the electronic
expansion valve or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
Replace the four-way valve
or the coil.
Replace the outdoor unit
PCB.
Discharge pipe
thermistor disconnected?
Check No. 01
Check the thermistors.
Check No. 13
Check the four-way valve.
Check No. 14
Check the refrigerant line.
Check No. 12
Check the electronic
expansion valve.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.