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Troubleshooting procedures:
•
Following the 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.
11-1. What to be Prechecked First
11-1-1. Power Voltage
The power voltage must be from AC 198V to 264V. If
the power voltage is not within this range, the air con-
ditioner may not work normally.
• Operations which are not deemed trouble
Operation of air conditioner
When the POWER plug socket of the unit is
inserted, the operation lamp on the control panel
flashes.
Room temperature is in the range under which the
compressor is turned on and the operation lamp is
lighting, but the compressor will not start.
Fan speed remains unchanged when the fan speed
knob is operated in the dry mode.
The indoor fan occasionally stops intermittently in
the dry mode.
The compressor will not switch on or off even when
the Thermo control is operated in the dry mode.
Warning lamp is lit and no cold air comes out.
Warning lamp blinks and no cold air comes out.
At the mode of fan only, the economy lamp is not lit
when the economy button is pushed.
The push button has not returned when the
economy button is pushed.
11. TROUBLESHOOTING CHART
Table 11-1
The operation lamp flashes indicating that power is turned on.
If this happens, push the I/O 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 mode.
In the dry mode, the fan operation is synchronized with the
compressor. As a result the fan is stopped when the compres-
sor is stopped.
In the dry mode, the compressor goes on and off at regular
intervals independent on the Thermo control.
When water in the tank has been drained out, stop the
operation of the compressor for safety. Fill the water in the
tank.
When the temperature in the freezing cycle (high pressure
side), stop the operation of the compressor for safety. Be sure
that the exhaust port has plugged with something or water is
not remain in the exhaust hose.
In case of the fan only mode, the economy lamp will not be lit
since the economy control will not be performed.
The economy button is of lock type. When the button is
pushed again, the button is set to OFF and the button will
come out. The operation button will come out all the time since
it is not of lock type.
– 12 –
11-1-2. Operations not Regarded as Failure
(Program Operation)
In terms of the control of air conditioner, the opera-
tions shown in Table 11-1 are made as a program
operation incorporated in a microcomputer. If a claim
is made about the operation, check it corresponds to
the contents in Table 11-1. If it does, it is an indis-
pensable operation for the control and maintenance
of the air conditioner but not a failure of the units.
Description
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