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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 35
R32 Sky-Air RZAG-M
2.2.2.17. “L5-00” – Inverter instantaneous overcurrent (AC output)
Possible cause
Check
Corrective action
Blown fuse.
Check fuse on outdoor main PCB.
Replace fuse if blown.
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 outdoor inverter PCB.
Check outdoor inverter PCB.
Check if the alive led is blinking in regular
intervals.
Check if the correct spare part is installed.
Adjust the power to the outdoor inverter
PCB.
Replace outdoor inverter PCB.
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 correct charge.
Replace compressor when required.
Investigate reason of breakdown.
Replace expansion valve when required.
Fix possible leak.
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 outdoor fan motor.
Check the fan motor.
Check fan motor connections and wiring.
Replace fan motor when required.
Adjust wiring when required.
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.
External factory (e.g. electrical noise).
(cause when error is reset after power
reset, and error happens again after a
while).
Check for source which could cause elec-
trical interference.
Avoid electrical interference.
Trigger
Effect
Reset
An output overcurrent is detected by
checking the current that flows in the
inverter DC section.
Unit will stop operating.
Manual reset via user interface.
Possible cause
Check
Corrective action
Installation of the unit is not in line with
specifications.
Check the installation specifications.
Refer to the installation manual.
Adjust the installation 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.
Stop valve is closed.
Check stop valve.
Open stop valve when required.
Faulty power module = faulty outdoor
inverter PCB.
Check outdoor inverter PCB.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Restore the power to the outdoor inverter
PCB.
Replace the outdoor inverter PCB when
required.