5.2
Cooling
Malfunction
Conditions
Causes
Remedy
the unit fails to
cool
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 con-
nected well to the terminals.
• Check that the cubicle doors are closed
The internal
fan works, the
external fan and
compressor
do not work.
The temperature inside the
enclosure is lower than what
is set on the adjustment ther-
mostat.
The adjustment thermostat
has failed
The antifreeze thermostat
has failed
Compressor,
external and
internal fan work
Cooling unit empty of fluid
Compressor mechanical
failure
Compressor
and external fan
work, internal
fan
does not work
Internal fan capacitor failed
Internal fan failed
External and in-
ternal fan work,
compressor
does not work
Compressor’s amperometric
protector failed (external to
the compressor, where
present)
Relay or PTC for compres-
sor starting failed
Capacitor for compressor
starting failed (where pres-
ent)
Compressor motor electrical
failure
High pressure safety switch
failed
Compressor contactor failed
(where present)
This is not a malfunction of the cooling unit.
To verify functioning when testing, lower the
thermostat setting until
the compressor and external fan start work-
ing and then reset the
thermostat.
Change the adjustment thermostat
Change the antifreeze thermostat
Call a refrigeration expert
Call a refrigeration expert e
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 start-
ing
Call a refrigeration expert
Call a refrigeration expert
Change the
contractor
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Micro Data Center Technical Manual 19