7
12. Troubleshooting
Malfunction Conditions Causes Remedy
The temperature inside the enclosure is lower
than what is set on the adjustment thermostat.
This is not a malfunction of the cooling unit. To verify func-
tioning when testing, lower the thermostat setting until the
compressor and external fan start working and then reset
the thermostat.
The internal fan works, the external fan
and compressor do not work.
The adjustment thermostat has failed Change the adjustment thermostat
No component works No electricity getting to the unit. This is not a malfunction of the cooling unit.
• Make sure the power cable has been connected well
to the terminals.
• Check that the cubicle doors and switches are closed
Cooling unit empty of fluid Call a refrigeration expert or the Manufacturer’s Technical
Assistance Service
Compressor, external and internal fan
work
Compressor mechanical failure Call a refrigeration expert or the Manufacturer’s Technical
Assistance Service
Internal fan capacitor failed Change the internal fan’s capacitor Compressor and external fan work, in-
ternal fan does not work
Internal fan failed Change the internal fan
Compressor’s amperometric protector failed (ex-
ternal to the compressor, where present)
Change the amperometric protector
Relay or PTC for compressor starting failed Change the relay or PTC for compressor starting
Capacitor for compressor starting failed (where
present)
Change the capacitor for compressor starting
Compressor motor electrical failure Call a refrigeration expert or the Manufacturer’s Technical
Assistance Service
High or low pressure safety switch failed Call a refrigeration expert or the Manufacturer’s Technical
Assistance Service
It fails to cool
External and internal fan work, compres-
sor does not work
Compressor contactor failed (where present) Change the contactor
External and internal fans work, com-
pressor works all the time
Cooling unit under sized for the heat dissipated
inside the enclosure
Change the cooling unit with another of greater capacity
Inside fan works, external fan and com-
pressor work irregularly
Insufficient gas in the cooling unit Call a refrigeration expert or the Manufacturer’s Technical
Assistance Service
High pressure safety switch triggered:
• Ambient temperature over the maximum
working limit
• Heat exchanger coil (condenser) either
dirty or clogged
• Ventilate the premises where the enclosure is in-
stalled to keep ambient temperature lower.
• Clean the exchanger with compressed air and deter-
gent
It is not cooling enough
External and internal fans work, com-
pressor works irregularly
Thermal protector inside the compressor trig-
gered:
• Ambient temperature over the maximum
working limit
• Heat exchanger coil (condenser) either
dirty or clogged
• Ventilate the premises where the enclosure is in-
stalled to keep ambient temperature lower.
• Clean the coil with compressed air and detergent
Enclosure door open Too much ambient air inside the enclosure This is not a malfunction of the cooling unit. Close the enclo-
sure door or disable the cooling unit
Enclosure protection level is below IP54 This is not a malfunction of the cooling unit. Seal enclosure
openings, e.g. for passage and upward path of wires
Too much condensate forming
Enclosure door closed
The enclosure/cooling unit connecting seal has
been fitted incorrectly
Check seal and remedy
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