L5-00 - Output Over Current Abnormality; P4-00 - Fin Thermistor Abnormality; U0-00 - Shortage Of Refrigerant - Daikin Comfora FTXP20~71L2V1B Service Manual

1 Perform a check of the outdoor unit fan motor. See
"2.9 Outdoor unit fan motor" on
Possible cause: Faulty outdoor unit fan motor.
2 Check if the power supply is conform with the regulations. See
"3.1 Power supply" on page 44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
3 Perform a check of the inverter PCB. See
page 31.
Possible cause: Faulty power module = inverter PCB.
4 Perform a check of the main PCB. See
page 32.
Possible cause: Faulty main PCB.
5 Check that the silicon grease is applied properly on the
radiation fin of the outdoor unit PCB. Adjust if needed.
Possible cause: Silicon grease NOT applied properly on the
radiation fin.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.25 L5-00 – Output over current abnormality
Trigger Effect
An output overcurrent Unit will stop
is detected by operating.
checking the current
that flows in the
inverter DC section.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Perform a check of the refrigerant circuit. See
circuit" on page 45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
2 Perform a check of the inverter PCB. See
page 31.
Possible cause: Faulty power module = inverter PCB.
3 Perform a check of the compressor. See
page 20.
Possible cause: Faulty compressor.
4 Check if the power supply is conform with the regulations. See
"3.1 Power supply" on page 44.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
ATXP20~35L2V1B + FTXP20~71L2V1B + ARXP20~35L2V1B +
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
page 34.
"2.7 Inverter PCB" on
"2.8 Main PCB" on
Reset
Manual reset via user
interface.
"3.2 Refrigerant
"2.7 Inverter PCB" on
"2.2 Compressor" on
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.26 P4-00 – Fin thermistor abnormality
Trigger Effect
Radiating fin Unit will stop
thermistor input is out operating.
of range.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Perform a check of the inverter PCB. See
page 31.
Possible cause: Faulty power module = inverter PCB.
2 Perform a check of the main PCB. See
page 32.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.5.27 U0-00 – Shortage of refrigerant
Trigger Effect
Refrigerant shortage Unit will stop
detected. operating.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Perform a check of
"2.13 Thermistors" on page 41.
Possible cause: Faulty refrigerant thermistor(s).
2 Perform a check of the refrigerant circuit. See
circuit" on page 45.
Possible cause:
▪ Stop valve is closed,
▪ Clogged refrigerant circuit,
▪ Refrigerant circuit NOT charged correctly,
▪ Humidity in the refrigerant circuit,
▪ Non-condensables in the refrigerant circuit,
▪ Leaking refrigerant circuit.
3 Perform a check of the compressor. See
page 20.
Possible cause: Faulty compressor.
4 Perform a check of the expansion valve. See
valve" on page 23.
Possible cause: Faulty expansion valve.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1 Troubleshooting
Reset
Manual reset via user
interface.
"2.7 Inverter PCB" on
"2.8 Main PCB" on
Reset
Automatic reset.
Power reset via
outdoor unit.
all refrigerant thermistors.
"3.2 Refrigerant
"2.2 Compressor" on
"2.3 Expansion
Service manual
See
11