ESIE17-08
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Part 2. Troubleshooting
2.2. Error based troubleshooting
15/11/18
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Version 1.1
Page 39
R32 Sky-Air RZAG-M
2.2.3. System
2.2.3.1. “U0-00” – Refrigerant shortage
2.2.3.2. “U1-00” – Reverse phase or open phase
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.
Trigger
Effect
Reset
Outdoor main PCB detects incorrect
power supply.
Unit will stop operating.
Manual reset via user interface.
Automatic reset.
Possible cause
Check
Corrective action
Faulty outdoor unit main PCB.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check if the outdoor main PCB receives
power.
Adjust the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
Faulty or disturbance of the power supply
(imbalance > 10%). Power drop. Short cir-
cuit.
Check if the power supply is conform with
regulations. No fluctuations in frequency.
Adjust power supply when required.
Power reset via outdoor unit.
Faulty capacity adapter on outdoor PCB.
Check if the correct adapter is installed.
Check if the correct spare part is installed.
Adjust capacity adapter when required.