Daikin ERSQ 011AAV1, Service Manual

Page: 190 / 262

Troubleshooting by Indication on the Remote Controller ESIE09-08
178 Troubleshooting
3.39
“L4”
Indoor Unit: Malfunction of Inverter Radiating Fin
Temperature Rise (R8T)
Remote Control
Display
L4
Subcode 8
Applicable
Models All indoor units
Method of
Malfunction
Detection
Fin temperature is detected by the thermistor of the radiation fin.
If fin temperature is too high, the compressor will slow down (capacity shortage).
Malfunction
Decision
Conditions
Faulty thermistor.
Broken wire.
Supposed
Causes
„ Defect of inverter PC board [A4P (1
ø
) or A5P (3
ø
)]
„ Defect of fin thermistor (R8T)
Troubleshooting
Caution
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
Faulty heat radiation of power unit
• Air suction or discharge opening
blocked
• Dirty radiator fin
• High water / discharge temperature
• Check heat conductive paste
Continue operation.
NO
YES
Replace the inverter PC board
assy
YES
The radiator
fin temperature is
supposed to have risen
to high value.
Properly connect.
YES
NO
Is the
connector X111A
of the fin thermistor properly
connected to the indoor
PC board?
Does the
malfunction code "L4-08"
recur when the unit starts
operation?
NO
Turn ON the power supply, and then
press the remote control check
button once.
[A4P (1
ø
) or A5P (3
ø
)] as well.