L4-00" - Radiation Fin Temperature Abnormality; L5-00" - Output Overcurrent Detection - Daikin EDLQO5CAV3 Service Manual

ESIE15-08B | Part 2. Troubleshooting
Faulty outdoor fan motor.
Faulty or disturbance of the power supply
(imbalance > 10%). Power drop. Short cir-
cuit.
Outdoor heat exchanger is dirty.
2.40. "L4-00" – Radiation fin temperature abnormality
Trigger
Outdoor inverter PCB detects fin tempera-
ture above 88°C.
Possible cause
Bad mechanical connection heat sink to
outdoor inverter PCB.
Refrigerant shortage (incorrect charge /
leakage).
2.41. "L5-00" – Output overcurrent detection
Trigger
Outdoor inverter PCB detects overcurrent
to power transistor.
Possible cause
Refrigerant circuit is clogged.
Faulty or disturbance of the power supply.
(Imbalance > 10%) Power drop.
Short circuit.
Faulty compressor.
Faulty outdoor inverter PCB.
Refrigerant is contaminated.
19/07/16
Daikin Altherma Monobloc CA
Check the fan motor (see page 103).
Check fan motor connections and wiring.
Check if the power supply is conform with
regulations. No fluctuations in frequency.
Check outdoor heat exchanger.
Effect
Unit will stop operating.
Check
Check connection between heat sink and
outdoor inverter PCB.
Check for refrigerant shortage (see
page 106).
Perform leak test.
Effect
Unit will stop operating.
Check
Check for possible blockage (blockages
can be checked by measuring the refriger-
ant/pipe temperature. Sudden drop in
temperature could indicate a blockage
(remark: this is not valid for the expansion
valve)).
Check if the power supply is conform with
regulations. No fluctuations in frequency.
Check compressor (see page 91).
Check compressor connection and wiring
(see page 144).
Check expansion valve operation (liquid
back issue).
Check refrigerant charge (see page 106)
+ check for leaks.
Check outdoor inverter PCB (see
page 101).
Check if the alive led is blinking in regular
intervals.
Check if the correct spare part is installed.
2. Error code based troubleshooting
Replace fan motor when required (see
page 116).
Adjust wiring when required.
Adjust power supply when required.
Power reset via outdoor unit.
Clean outdoor heat exchanger when
required.
Reset
Manual reset via user interface.
Corrective action
Restore connection between heat sink
and outdoor inverter PCB.
If required repair the leak and charge the
correct amount of refrigerant.
Reset
Manual reset via user interface.
Corrective action
Replace the blocked part.
Adjust power supply when required.
Power reset via outdoor unit.
Replace the compressor when required.
(see page 125).
Investigate the reason of breakdown.
Replace expansion valve when required.
Fix the possible leak.
Adjust the power to the outdoor inverter
PCB.
Replace outdoor inverter PCB when
required (see page 122).
Replace refrigerant.
Page 37