Radiation Fin Temperature Rise - Daikin MKS-T Series Service Manual

Troubleshooting for Outdoor Unit

7.20 Radiation Fin Temperature Rise

L4
Error Code
Outdoor Unit LED
A j 1 h 2 h 3 h 4 i 5 h
Display
Method of Error A radiation fin temperature rise is detected by checking the radiation fin temperature with the
Detection compressor on.
Error Decision
 The radiation fin temperature with the compressor on is above A °C.
Conditions  The error is cleared when the radiation fin temperature drops below B °C
 If the error repeats, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
50/65/80 class
90 class
Supposed  Defective outdoor fan motor
Causes  Short circuit
 Defective radiation fin thermistor
 Disconnection of connector
 Defective outdoor unit PCB
 Silicone grease is not applied properly on the radiation fin after replacing the outdoor unit
Troubleshooting
Reference
Check No.17 Refer to P.176
165
A (°C)
90
100
PCB.
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn off the power. Then, turn on
the power to restart the system.
Error displayed again?
NO
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
B (°C)
84
90
YES
Has the PCB been
replaced?
NO
Check the radiation fin
temperature.
Above A °C?
YES
NG
NO
SiSG121917E
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.
(R22540)
Part 6 Service Diagnosis