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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
No.
Troubleshooting Procedure
1
First Confirmation
2
Primary Judgment
3
Judgment by Flashing LED of Indoor Unit
Self-Diagnosis by Remote Controller
4
(Check Code)
5
Judgment of Trouble by Symptom
6
Trouble Diagnosis by Outdoor LED
7
Troubleshooting
8
Inspection of the Main Parts
How to Simply Judge Whether Outdoor
9
Fan Motor is Good or Bad
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 to 373V) remains and discharging takes a lot of
time (for more than 5 minutes). 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 solder iron, etc.
11. HOW TO DIAGNOSE THE TROUBLE
Page
61
62
62
63
70
72
80
82
83
Discharge position + and - of C13
(Discharging period: 10 seconds or more)
The electrolytic capacitor may not normally discharge
according to error contents and the voltage may remain.
Therefore, be sure to discharge the capacitor.
For discharging, never use a screwdriver and others
for short-circuiting between + and – electrodes,
As the electrolytic capacitor is one with a large
capacity, it is very dangerous because a large electric
spark will occur.
<Discharging method>
Connect the discharge resistance (approx. 100Ω/40W)
or plug of the soldering iron to voltage between +
and – of C13 on the main P.C. board MCC-1571, and
then perform discharging.
- 60 -
FILE NO. SVM-15074
WARNING
WARNING
Fig. 11-1
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