How To Diagnose The Trouble - Toshiba RAS-M07G3DV-E Service Manual

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.)
No. Troubleshooting Procedure
1 First Confirmation
2 Primary Judgment
3 Judgment by Flashing LED of the signal receiving unit
4 Self-Diagnosis by Remote Controller
5 Judgment of Trouble by Every Symptom
11-1. First Confirmation
11-1-1. Confirmation of Power Supply
Confirm that the power breaker operates (ON) normally.
11-1-2. Confirmation of Power Voltage
Confirm that power voltage is AC 220–230–240 ± 10%.
If power voltage is not in this range, the unit may not operate normally.
11-1-3. Operation Which is not a Trouble (Program Operation)
For controlling the air conditioner, the program operations are built in the microcomputer as described in the
following table.
If a claim is made for running operation, check whether or not it meets to the contents in the following table.
When it does, we inform you that it is not trouble of equipment, but it is indispensable for controlling and
maintaining of air conditioner.
No. Operation of air conditioner
When power breaker is turned "ON", the
operation indicator (Green) of the signal
1
receiving unit flashes.
Compressor may not operate even if the room
temperature is within range of compressor-ON.
2
In Dry and ECO mode, FAN (air flow) display
3 does not change even though FAN (air flow
select) button is operated.
In AUTO mode, the operation mode is changed. After selecting Cool or Heat mode, select an operation
4

11. HOW TO DIAGNOSE THE TROUBLE

Table 11-1
No.
6 How to Check Simply the Main Parts
7 Troubleshooting
8 How to Diagnose Trouble in Outdoor Unit
9 How to Check Simply the Main Parts
How to Simply Judge Whether Outdoor Fan Motor is
10
Good or Bad
Table 11-1-1
The OPERATION lamp of the signal receiving unit
flashes when power source is turned on. If [
is operated once, flashing stops.
(Flashes also in power failure)
The compressor does not operate while compressor
restart delay timer (3-minutes timer) operates.
The same phenomenon is found after power source
has been turned on because 3-minutes timer operates.
The air flow indication is fixed to [AUTO].
mode again if the compressor keeps stop status for
15 minutes.
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Troubleshooting Procedure
Description
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