L5-00" - Inverter Instantaneous Overcurrent (Ac Output) - Daikin FTXJ-M Service Manual

ESIE16-02K | Part 2. Troubleshooting
Possible cause
Silicon grease is not applied properly on
the radiation fin.
More info:
Check procedures
"Fan motor" on page 57
"Refrigerant thermistors" on page 58
"Main PCB" on page 57
""L4-00" – Inverter radiating fin temperature abnormality" on page 129
2.2.2.22. "L5-00" – Inverter instantaneous overcurrent (AC output)
Trigger
An output overcurrent is detected by
checking the current that flows in the
inverter DC section.
Possible cause
Installation of the unit is not in line with
specifications.
Refrigerant shortage.
Humidity in refrigerant (ice formation in
expansion valve).
Non condensables in refrigerant.
Stop valve is closed.
Faulty power module = faulty outdoor
inverter PCB.
Faulty compressor.
Faulty or disturbance of the power supply
(imbalance > 10%). Power drop. Short cir-
cuit.
More info:
I
NFORMATION
The Inverter PCB and Main PCB are 1 PCB in this unit.
Check procedures
"Main PCB" on page 57
"Compressor" on page 53
"Electronic expansion valve" on page 55
31/05/21 | Version 1.1
RA R32 Split & multi split M-Series
Check
Check the silicon grease on the outdoor
unit PCB.
Replacing procedures
"Replacing DC fan motor assembly" on page 80
"Replacing thermistors" on page 87
"Replacing main PCB" on page 85
Effect
Unit will stop operating.
Check
Check the installation specifications.
Refer to the installation manual.
Check for refrigerant shortage. Refer to
the nameplate for the correct charge.
Check for humidity in the refrigerant.
Check for non condensables in refriger-
ant.
Check stop valve.
Check outdoor inverter PCB.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
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.
Check if the power supply is conform with
regulations. No fluctuations in frequency.
Replacing procedures
"Replacing main PCB" on page 85
"Replacing compressor" on page 77
"Replacing expansion valve body" on page 82
2.2. Error based troubleshooting
Corrective action
Adjust silicon grease when required.
Reset
Manual reset via user interface.
Corrective action
Adjust the installation when required.
Charge the correct refrigerant amount
when required.
In case of suspicion of humidity, recover,
vacuum and recharge with virgin refriger-
ant.
In case of suspicion of non condensables,
recover, vacuum and recharge with virgin
refrigerant.
Open stop valve when required.
Restore the power to the outdoor inverter
PCB.
Replace the outdoor inverter PCB when
required.
Replace compressor when required.
Investigate reason of breakdown.
Replace expansion valve when required.
Fix possible leak.
Adjust power supply when required.
Power reset via outdoor unit.
Page 37