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11. HOW TO DIAGNOSE THE TROUBLE
Table 11-1
No.
1
2
3
4
5
6
7
8
Troubleshooting Procedure
First Confirmation
Primary Judgment
Judgment by Flashing LED of Indoor Unit (Switch Panel)
Self-Diagnosis by Remote Controller (Check Code)
Judgment of Trouble by Every Symptom
How to Check Simply the Main Parts
P.C. Board Layout
Service P.C. Board Selection Information
Page
61
62
62
63
66
70
71
72
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 220–240 ±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 de-
scribed 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.
Table 11-1-1
No.
1
2
3
4
5
6
7
8
Operation of air conditioner
When power breaker is turned “ON”, the
operation lamp (Green) of the indoor unit
flashes.
Compressor may not operate even if the room
temperature is within range of compressor-ON.
In DRY and ECONO. mode, FAN (air flow)
display does not change even though FAN (air
flow select) button is operated.
Increasing of compressor motor speed stops
approx. 30 seconds after operation started, and
then compressor motor speed increases again
approx. 30 seconds after.
The set value of the remote control should be
below the room temperature.
In AUTO mode, the operation mode is
changed.
In HEAT mode, the compressor motor speed
does not increase up to the maximum speed or
decreases before the temperature arrives at
the set temperature.
Cool, Dry, or Heat operation cannot be per-
formed.
Description
The OPERATION lamp of the indoor unit flashes when power
source is turned on. If “START/STOP” button 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].
For smooth operation of the compressor, the compressor
motor speed is restricted to Max. 33 rps for 2 minutes and
Max. 57 rps for 2 minutes to 4 minutes, respectively after the
operation has started.
If the set value is above the room temperature, Cooling
operation is not performed. And check whether battery of the
remote control is consumed or not.
After selecting Cool or Heat mode, select an operation mode
again if the compressor keeps stop status for 15 minutes.
The compressor motor speed may decrease by high-temp.
release control (Release protective operation by temp.-up of
the indoor heat exchanger) or current release control.
When the unit in other room operates previously in different
mode, Fan Only operation is performed because of first-push
priority control. (Cool operation and Dry operation can be
concurrently performed.)
Summary of Contents for RAS-M10SMUCV-E
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