Si10-417
Troubleshooting
Service Diagnosis
103
5.2.39 Electrical Box Temperature Rise
Remote
Controller
Display
L3
Outdoor
Unit LED
Display
A
5
1
4
2
4
3
1
4
4
Method of
Malfunction
Detection
An electrical box temperature rise is detected by
checking the radiation fin thermistor with the compressor
off.
Malfunction
Decision
Conditions
With the compressor off, the radiation fin temperature is
above 80°C (above 75°C in the case of 8.0 · 9.0kW
class). (Reset is made when the temperature drops
below 70°C.)
Supposed
Causes
Fin temperature rise due to defective outdoor unit fan
Fin temperature rise due to short-circuit
Fin thermistor defective
Connector in poor contact
Outdoor unit PCB defective
Trouble
shooting
Check No.6
Refer to
P.157
Check
No.7-1
Refer to
P.158
Check No.9
Refer to
P.160
Turn off the power and turn it
on again.
Replace the fan
motor.
Correct the
connectors and fan
motor leads.
Replace the outdoor
unit PCB.
Clean up the radiation
fin.
Error
again or outdoor unit fan
activated?
YES
NO
Slightly dirty
C
heck No.
9
Check the outdoor unit
fan or related.
Malfunctioning
Radiation fin dirty?
Too dirty
Functioning
C
heck No.
7-1
Check the installation condition.
To cool down the electricals, the
outdoor unit fan gets started when
the radiation fin temperature rises
above 78˚C and stops itself when
it drops below 70˚C.
A
B
WARNING
Caution
Be sure to turn off power switch before connect or
disconnect connector, or parts damage may be occurred.
Si10-417.fm Page 103 Wednesday, September 22, 2004 6:38 PM
