– 79 –
10. HOW TO DIAGNOSE THE TROUBLE
The pulse modulating circuits are mounted to both indoor and outdoor units. Therefore, diagnose troubles
according to the trouble diagnosis procedure as described below. (Refer to the check points in servicing written
on the wiring diagrams attached to the indoor/outdoor units.)
Table 10-1
No.
1
2
3
4
5
6
7
8
9
Troubleshooting Procedure
First Confirmation
Primary Judgment
Judgment by Flashing LED of Indoor Unit
Self-Diagnosis by Remote Controller (Check Code)
Judgment of Trouble by Every Symptom
Trouble Diagnosis by Outdoor LED
How to Diagnose Trouble in Outdoor Unit
How to Check Simply the Main Parts
How to Simply Judge Whether Outdoor Fan Motor is Good or Bad
Page
80
80
81
82
85
90
91
92
97
NOTE :
A large-capacity electrolytic capacitor is used in the
outdoor unit controller (inverter). Therefore, if the
power supply is turned off, charge (charging voltage
DC280V) remains and discharging takes a lot of
time. After turning off the power source, if touching
the charging section before discharging, an electrical
shock may be caused. Discharge the electrolytic
capacitor completely by using soldering iron, etc.
< Discharging method >
(1) Remove the inverter cover (plating) by opening
four mounting claws.
(2) As shown below, connect the discharge
resistance (approx. 100
Ω
/40W) or plug of the
soldering iron to voltage b – terminals of
the C13 (“CAUTION HIGH VOLTAGE 320V” is
indicated.) electrolytic capacitor (760µF/400V) on
P.C. board, and then perform discharging.
Fig. 10-1
Discharging position
(Discharging period
10 seconds or more)
Plug of
soldering iron
Inverter cover
P. C. board
(Soldered surface)