Troubleshooting Chart For Ras-09Ek/Rav-M240A-E; What To Be Prechecked First - Toshiba RAV-M240A-E Service Manual

8. TROUBLESHOOTING CHART FOR RAS-09EK/RAV-M240A-E

Troubleshooting Procedures:
• Following details of "What to be prechecked first", make sure of the basic items.
• When there is no trouble corresponding to above, check in detail the faulty parts following "How to judge
faulty parts by symptoms" later.

8-1. What to be Prechecked First

8-1-1. Power Supply Voltage
The power supply voltage must be from AC 198V to
264V. If the power voltage is not within this range, the
air-conditioner may not work normally.
8-1-2. Incorrect Cable Connection between
Indoor and Outdoor Units.
The indoor unit is connected to the outdoor unit with 3
cables. Make certain that the terminals of indoor and
outdoor connectors have been connected properly by
the same numbers. If not connected as specified, the
outdoor unit won't operate normally.
• Operations which are not Deemed Trouble
Operation of air-conditioner
When the POWER plug of the indoor unit is inserted, the
OPERATION lamp flashes.
Room temperature is in the range under which the
compressor is turned on, but the compressor will not start.
Fan speed remains unchanged when the fan speed button
is operated in the dry operation.
Room temperature is in the range under which the
compressor is turned off, but the compressor will not stop.
The compressor will not switch on or off even when the
thermostat control is operated in the dry operation.
8-1-3. Operations not Regarded as Failure
(program operation)
In terms of the control of air-conditioner, the opera-
tions shown in Table 8-1 are made as a program op-
eration incorporated in a microcomputer. If a claim is
made about the operation, check it corresponds to
the contents in the table. If it does, it is an indispens-
able operation for the control and maintenance of the
air-conditioner but not a failure of the units.
Table 8-1
The OPERATION lamp flashes, indicating that power is
turned on. If this happens, press the START/STOP button
once, and flash will stop. Power failure also causes the
same lamp to flash.
The compressor will not start while the compressor
restart prevention timer (three-minute timer) is actuated.
This applies also when power is turned on.
Fan speed is fixed at Low in the dry operation.
The compressor will not stop while the compressor on-
hold timer (two-minute timer) is actuated.
In the dry operation, the compressor goes on and off at
regular intervals, independent of the thermostat control.
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Description