Radiation Fin Temperature Rise - Daikin 4MXS-R Series Service Manual

SiUS121736EA

7.19 Radiation Fin Temperature Rise

L4
Error Code
j
Outdoor Unit LED
A
Display
Method of Error A radiation fin temperature rise is detected by checking the radiation fin temperature with the
Detection compressor on.
Error Decision
Conditions
Supposed
Causes
Troubleshooting
Check No.17
Turn off the power. Then, turn on
the power to restart the system.
Refer to P.216
Check No.19
Refer to P.217
Note: Refer to Silicone Grease on Power Transistor/Diode Bridge on page 249 for details.
Service Diagnosis
h h h i
1 2 3 4
The radiation fin temperature with the compressor on is above
The error is cleared when the temperature drops below
A B
90°C (194°F) 85°C (185°F)
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit PCB
Silicone grease not applied properly on the radiation fin after replacing the outdoor unit PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Error displayed again?
NO
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
h
5
YES
Has the PCB been
replaced?
NO
Check the radiation fin
temperature.
Above A?
YES
NG
NO
Troubleshooting for Outdoor Unit
A .
B.
YES
Check if silicone grease is
applied properly on the
radiation fin. If not, apply
the silicone grease.
NO
Replace the outdoor unit
PCB (main PCB).
Replace the outdoor fan
motor.
Correct the connectors and
fan motor leads.
Replace the outdoor unit
PCB (main PCB).
Check the installation
condition.
Go to Check No. 17.
Clean up the radiation fin.
(R23953)
206