L4-00" - Inverter Radiating Fin Temperature Abnormality - Daikin 2MXM50M Service Manual

ESIE16-02B | Part 2. Troubleshooting
Possible cause
Faulty outdoor inverter PCB.
Faulty radiation fin thermistor.
Faulty outdoor fan motor.
Faulty or disturbance of the power supply
(imbalance > 10%). Power drop. Short cir-
cuit.
Outdoor heat exchanger is dirty.
More info:
I
NFORMATION
The Inverter PCB and Main PCB are 1 PCB in this unit.
Check procedures
"Main PCB" on page 53
"Fan motor" on page 51
""L3-00" – Switch box temperature abnormality" on page 111
2.2.2.21. "L4-00" – Inverter radiating fin temperature abnormality
Trigger
Radiation fin temperature rise is detected.
Possible cause
Faulty outdoor fan motor.
Faulty or disturbance of the power supply
(imbalance > 10%). Power drop. Short cir-
cuit.
Faulty radiating fin thermistor.
Faulty outdoor unit PCB in which radiating
fin thermistor is connected.
Silicon grease is not applied properly on
the radiation fin.
More info:
Check procedures
"Fan motor" on page 51
"Refrigerant thermistors" on page 56
"Main PCB" on page 53
""L4-00" – Inverter radiating fin temperature abnormality" on page 111
4/04/17 | Version 1.1
RA R32 Split & multi split M-Series
Check
Check outdoor inverter PCB.
Check if the HAP LED is blinking in regu-
lar intervals.
Check if the correct spare part is installed.
Check the fan motor.
Check fan motor connections and wiring.
Check if the power supply is conform with
regulations. No fluctuations in frequency.
Check outdoor heat exchanger.
Replacing procedures
"Replacing main PCB" on page 84
"Replacing DC fan motor assembly" on page 79
Effect
Unit will stop operating.
Check
Check the fan motor.
Check fan motor connections and wiring.
Check if the power supply is conform with
regulations. No fluctuations in frequency.
Check radiating fin thermistor.
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.
Check the silicon grease on the outdoor
unit PCB.
Replacing procedures
"Replacing DC fan motor assembly" on page 79
"Replacing thermistors" on page 87
"Replacing main PCB" on page 84
2.2. Error based troubleshooting
Corrective action
Restore the power to the outdoor inverter
PCB.
Replace the outdoor inverter PCB when
required.
Replace fan motor when required.
Adjust wiring when required.
Adjust power supply when required.
Power reset via outdoor unit.
Clean outdoor heat exchanger when
required.
Reset
Automatic reset.
Power reset via outdoor unit.
Corrective action
Replace fan motor when required.
Adjust wiring when required.
Adjust power supply when required.
Power reset via outdoor unit.
Replace radiating fin thermistor when
required.
Restore the power to the outdoor main
PCB.
Replace outdoor main PCB when HAP
LED is not blinking in regular intervals.
Adjust silicon grease when required.
Page 35