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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
Problem
c
Cause
d
Action
e
The unit does not oper-
ate. The power indicator
lamp on the control panel
is not ON
No power input
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
Air conditioner does not
operate.
Power indicator lamp is
green.
Cool light is green and
turns yellow
High ambient temperature
resulting in HP pressure
sensitive switch cut-out
(automatic reset) or low
pressure conditions are de-
tected
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
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.
Ambient temperature is not
within working range 20 °C –
60 °C
Wait until ambient tem-
perature is within working
range.
Allow the unit to cool
down (10-15 min.)
Air conditioner operates -
but no cooling. The power
indicator lamp is green.
Cooling lamp is red
Refrigerant leak.
Internal temperature protec-
tion compressor has cut-out.
Faulty compressor
Call an air condition ser-
vice technician
Continued overleaf
