L4" Outdoor Unit: Malfunction Of Inverter Radiating Fin; Temperature Rise - Panasonic U-4..6ML5XPQ Service Manual

Panasonic
L4
3.35 " " Outdoor Unit:

Temperature Rise

L4
Remote
Controller
Display
Applicable U-4..6ML5DPQ, U-4..6ML5XPQ
Models
Method of Fin temperature is detected by the thermistor of the radiation fin.
Malfunction
Detection
Malfunction When the temperature of the inverter radiation fin increases above 83°C.
Decision
Conditions
Supposed
Causes
Troubleshooting
Troubleshooting
Malfunction of Inverter Radiating Fin
Actuation of fin thermal (Actuates above 83°C)
Defect of inverter PC board (A2P)
Defect of fin thermistor
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
The radiator
fin temperature is supposed
to have risen to 84°C
or more.
NO
Is the
connector X111A of
the fin thermistor properly
connected to the outdoor
PC board?
YES
Turn ON the power supply,
and then press the remote
controller check button once.
Is the
P4
malfunction code " "
displayed on the remote
controller?
NO
Does the
L4
malfunction code " "
recur when the unit starts
operation?
NO
Troubleshooting by Indication on the Remote Controller
YES
NO
YES
YES
Faulty heat radiation of power unit
• Air suction opening blocked
• Dirty radiator fin
• High outdoor temperature
Properly connect.
To "P4" troubleshooting
Replace the inverter PC board
assy (A2P) as well.
Continue operation.
183