Daikin ALTHERMA HT ERSQ 011 AA Service Manual page 201

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