Toshiba Carrier RAS-09EA Series, Service Manual

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9. TROUBLESHOOTING CHART
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.
9-1. What to be Prechecked First
9-1-1. Power Supply Voltage
The power supply voltage must be AC 220/230/240V
(1ø50 Hz) for EK. If the power supply voltage is not
within this range, the air-conditioner may not work
normally.
9-1-2. 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.
9-1-3. Operations not Regarded as Failure
(program operation)
In terms of the control of air-conditioner, the opera-
tions shown in Table 9-1 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 Table. If it does, it is an indispensable
operation for the control and maintenance of the air-
conditioner but not a failure of the units.
• Operations which are not Deemed Trouble
Table 9-1
Operation of air-conditioner
When the POWER plug socket 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
thermo control is operated in the dry operation.
Description
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 Thermo control.