ESIE16-02K
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Part 2. Troubleshooting
2.2. Error based troubleshooting
31/05/21
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Version 1.1
Page 39
RA R32 Split & multi split M-Series
2.2.3. System
2.2.3.1. “U0-00” – Refrigerant shortage
More info:
2.2.3.2. “U2-00” – Power supply abnormality or instantaneous power failure
Trigger
Effect
Reset
Refrigerant shortage detected.
Unit will stop operating.
Automatic reset.
Power reset via outdoor unit.
Possible cause
Check
Corrective action
Faulty air thermistor.
Check air thermistor.
Replace air thermistor when required.
Faulty discharge thermistor.
Check discharge thermistor.
Replace discharge thermistor when
required.
Faulty outdoor heat exchanger thermistor.
Check outdoor heat exchanger thermistor.
Replace outdoor heat exchanger thermis-
tor when required.
Stop valve is closed.
Check stop valve.
Open stop valve when required.
Refrigerant shortage.
Check for refrigerant shortage. Refer to
the nameplate for the correct charge.
Charge the correct refrigerant amount
when required.
Humidity in refrigerant (ice formation in
expansion valve).
Check for humidity in the refrigerant.
In case of suspicion of humidity, recover,
vacuum and recharge with virgin refriger-
ant.
Non condensables in refrigerant.
Check for non condensables in refriger-
ant.
In case of suspicion of non condensables,
recover, vacuum and recharge with virgin
refrigerant.
Faulty compressor.
Check compressor.
Check connections and wiring of the com-
pressor.
Check expansion valve (liquid back
issue).
Check the refrigerant charge. Refer to the
nameplate for the correct charge.
Replace compressor when required.
Investigate reason of breakdown.
Replace expansion valve when required.
Fix possible leak.
Faulty expansion valve.
Check the expansion valve.
Replace the expansion valve body or
motor when required.
Check procedures
Replacing procedures
"Refrigerant thermistors" on page 58
"Replacing compressor" on page 77
"Electronic expansion valve" on page 55
"Replacing expansion valve body" on page 82
"Replacing expansion valve motor" on page 83
Trigger
Effect
Reset
There is no zero-cross detected in
approximately 10 seconds (indoor unit
PCB).
Unit will stop operating.
Power reset via outdoor unit.
Abnormal voltage drop (< 150-180 V) is
detected by the DC voltage detection cir-
cuit.
Unit will stop operating.
Automatic restart after compressor
stand-by of 3 minutes.
Abnormal voltage rise is detected by the
over-voltage detection circuit.
Unit will stop operating.
Automatic restart after compressor
stand-by of 3 minutes.
