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