Specifications

SiUS12-928_A Troubleshooting
Service Diagnosis 116
5.11 OL Activation (Compressor Overload)
Remote
Controller
Display
E5
Outdoor Unit LED
Display
A 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 error repeats twice, 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
 Refrigerant shortage
 Defective four
-way valve
 Defective outdoor unit PCB
 Water mixed in refrigerant
 Defective electronic expansion valve
 Defective stop valve
Troubleshooting
Check No.04
Refer to P.150
Check No.05
Refer to P.151
Check No.06
Refer to P.152
Check No.11
Refer to P.155
(R7137)
Caution
YES
Malfunctioning
∗ Discharge pipe thermistor
NO
Functioning
Functioning
Malfunctioning
∗ Refrigerant shortage
∗ Four way valve
∗ Water mixed
∗ Stop valve
Malfunctioning
Functioning
Malfunctioning
Functioning
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. 06
Check the thermistors.
Check No. 05
Check the four way
valve.
Check No. 11
Check the refrigerant
line.
Check No. 04
Check the electronic
expansion valve.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.