– 73 –
11. 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 11-1
Fig. 11-1
No.
1
2
3
4
5
6
7
8
9
10
Troubleshooting Procedure
First Confirmation
Primary Judgment
Self-Diagnosis by Remote Controller (Check Code)
Judgment of Trouble by Every Symptom
Check Code 1C (Miswiring in indoor/outdoor units) and 1E
Trouble Diagnosis by Outdoor LED
Troubleshooting
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
74
74
75
78
83
84
85
86
87
92
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
DC320V) remains and discharging takes a lot of
time. After turning off the power source, if touching
the charging section before discharging, an electri-
cal 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 resis-
tance (approx. 100W/40W) or plug of the solder-
ing iron to voltage b – terminals of the
C13 (“CAUTION HIGH VOLTAGE 320V” is
indicated.) electrolytic capacitor (500µF/400V)
on P.C. board, and then perform discharging.
Discharging position
(Discharging period
10 seconds or more)
Plug of
soldering iron
Inverter cover
P. C. board
(Soldered surface)
Summary of Contents for RAS-3M18SACV-E
Page 21: ... 21 4 2 Outdoor Unit RAS 3M18SAV E RAS 3M18SACV E ...
Page 110: ... 110 MCC 1438 ...
Page 111: ... 111 MCC 818 ...
