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Troubleshooting
■ If Error code is displayed on indoor or outdoor LED, check as follows;
Contents
Q1 Turn on the system. But outdoor units PCB displayed E201 or E101 Error code. Check point Remarks
Check point Remarks
Step 1
Check to power cable to indoor units.
Check to communication cable indoor units.
Contents
Q2 Turn on the system. But outdoor units PCB displayed E203 Error code.
Check point Remarks
Guidance
Outdoor communication error between
the outdoor main PCB and sub PCB.
Step 1 Check to sub PCB wire and replace it.
Contents
Q3 Turn on the indoor units. But indoor unit displayed E121/122/123/154 Error code.
Error code
Explanation
E121 Indoor unit room temperature sensor error (open/short)
E122 Indoor unit heat exchanger in temperature sensor error (open/short)
E123 Indoor unit heat exchanger out temperature sensor error (open/short)
E154 Indoor unite fan error
Guidance
Please, all units turn off and check to indoor unit’s PCB and wire connection.
E121/122/123 error detected, replace related sensor.
Contents
Q4 Turn on the system. But indoor unit displayed E162/163 Error code.
Error code
Explanation
E162 Indoor unit EEPROM Error.
E163 Indoor unit EEPROM Option Error.
Guidance
Please, all units turn off and follow guidance.
E163 : Please reset indoor Option code.
E163 : If you don’t know about that, replace indoor unit PCB which is related.
E162 : Please replace indoor unit PCB which is related.
Contents
Q5 Turn on the system. But outdoor unit displayed E221/237/251/320 Error code.
Error code
Explanation
E221 Outside temperature sensor error (open/short)
E237 Condenser temperature sensor error (open/short)
E251 Compressor Discharge temperature sensor error (open/short)
E320 Compressor OLP sensor error (open/short)
Guidance Please, The System turn off and replace sensor which is related.
Contents
Q6
Check point Remarks
Analysis
Outdoor unit fails to search indoor units or to check
indoor address.
The pipe checking operation
Step 1
each other, check to connecting.
Pipe connecting
Step 2
Check to indoor unit’s sensor being connected in
proper location.
EEV Coil
Step 3
Check to indoor unit’s sensor being connected in proper
location.
Indoor sensor
Guidance
During the pipe checking operation , system check temperature change of indoor Heat exchanger.
In case, indoor sensor defect, EEV coil connector detach, malfunction of EEV, Leakage of Refrigerant,
and etc can make this case.
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