–
50
–
11. HOW TO DIAGNOSE THE TROUBLE
The pulse motor 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
Precautions when handling the new inverter (3DV Inverter)
CAUTION: HIGH VOLTAGEN
The high voltage circuit is incorporated.
Be careful to do the check service, as the electric shock may be caused in case of touching parts on the
P.C. board by hand.
No.
COMMENT
Page
1
First Confirmation
2
Primary Judgment
3
Judgment by Flashing LED of Indoor Unit
4
Self-Diagnosis by Remote Controlller (Check Code)
5
Judgment of Trouble by Every Symptom
6
Check Code 18 and 1E
7
Trouble shooting
8
How to Diagnose Trouble in Outdoor Unit
9
How to Check Simple the Main Parts
10
How to Simply Judge Whether Outdoor Fan motor is Good or Bad
* Refer to
SERVICE MANUAL
of connected
outdoor unit.
CAUTION
A high voltage (equivalent to the supply voltage) is also energized to ground through the
sensors, PMV and other low-voltage circuits.
The sensor leads and other wires are covered with insulated tubes for protection.
Nevertheless, care must be taken to ensure that these wires are not pinched.
Take sufficient care to avoid directly touching any of the circuit parts without first turning off
the power. At times such as when the circuit board is to be replaced, place the circuit board
assembly in a vertical position.
Laying the board flat on an electrically conductive object (such as the top panel of the air conditioner’s
outdoor unit) while a charge is still retained by the electrolytic capacitors of the inverter’s main circuit may
cause short-circuiting between the electrolytic capacitors and secondary circuit components and result in
damage to the components.
