Electrical Box Temperature Rise - Daikin FTXM-K Series Service Manual

Troubleshooting

4.22 Electrical Box Temperature Rise

L3
Error Code
Method of Error An electrical box temperature rise is detected by checking the radiation fin thermistor with the
compressor off.
Detection
Error Decision
Conditions
20/25/35 class
42/50 class
Supposed
Causes
Troubleshooting
Check No.17
Refer to P.103
Check No.19
Refer to P.104
93
With the compressor off, the radiation fin temperature is above A°C.
The error is cleared when the radiation fin temperature drops below B°C.
To cool the electrical components, the outdoor fan starts when the radiation fin temperature
rises above C°C. The outdoor fan stops when the radiation fin temperature drops below
B°C.
A (°C)
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit 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 again or outdoor
fan activated?
NO
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
B (°C) C (°C)
98 75 83
90 64 81
To cool the electrical components, the
outdoor fan starts when the radiation
fin temperature rises above C ˚C. The
outdoor fan stops when the radiation
fin temperature drops below B ˚C.
YES
Check the radiation fin
temperature.
Above A˚C?
YES
NG
NO
SiBE041434E
WARNING
NO
Replace the outdoor unit
PCB (main PCB).
Replace the outdoor fan
motor.
Correct the connectors
and fan motor lead wire.
Replace the outdoor unit
PCB (main PCB).
Check the installation
condition.
Go to Check No. 17.
Clean up the radiation fin.
(R21436)
Service Diagnosis