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9-4. Unit Problems and Inspection Points
Problems
Inspection
points
Self-Diagnostics check
1 Indoor controller
(control unit)
2 Indoor fan motor
3 Room temperature
sensor
4 Heat exchanger
temperature sensor
5 Inter-unit cable
6 Switch circuit board
7 Outdoor control
circuit board
8 Diode module
9 HIC
! Electrolytic capacitor
" Fuse
# Compressor
$ Compressor
protective thermistor
% Outdoor fan motor
& 4-way valve
( Coil thermistor
) Electric expansion
valve
~ Branch tubing
temperature sensor
+ Breaker
, Refrigerant gas
pressure
• For details about the inspection points, refer to Inspection points for each part.
Indoor unit
Outdoor unit
23
Others
Note
Measure during
a test run.
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