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Fault finding guide
Fault finding
Malfunctions that might occur in the operation of the air conditioner are listed in the ta-
ble below. Reference to actions required to restore the air conditioner to normal operat-
ing condition are also indicated.
If the air conditioner should malfunction, find the problem in column 1. Columns 2 and 3
describe the possible causes and corrective actions. The list of problems, causes, and
remedies will only give an indication of where a possible problem can be and what ac-
tions are needed to correct the problem.
Problems, which are caused by electrical faults or related to the cooling plant, have to
be corrected by skilled personnel
The unit does not oper-
ate. The power indicator
lamp on the control panel
is not ON
Air conditioner does not
operate.
Power indicator lamp is
green.
Cool light is green and
turns yellow
Cooling circuit only oper-
ates a very short time be-
fore HP/LP pressure sen-
sitive switch cut-out
Power indicator lamp is
green
Cool light is green and
turns yellow.
Air conditioner operates -
but no cooling. The power
indicator lamp is green.
Cooling lamp is red
Problem
No power input
High ambient temperature
resulting in HP pressure
sensitive switch cut-out
(automatic reset) or low
pressure conditions are de-
tected
Ambient temperature is not
within working range 20 °C –
60 °C
Refrigerant leak.
Internal temperature protec-
tion compressor has cut-out.
Faulty compressor
Cause
Check that the power ca-
ble is correctly connected
to power source and unit
Check that power source
is turned on and providing
1 × 230 V AC
Check the condenser side
for sufficient air flow. Be
sure that no air path is
blocked
The evaporator is blocked
with ice. This will auto re-
set in time.
Yellow light means the
unit is operated ineffi-
ciently
Wait until ambient tem-
perature is within working
range.
Allow the unit to cool
down (10-15 min.)
Call an air condition ser-
vice technician
Action
Continued overleaf
33
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