Troubleshooting - SIFA SS FV 0409 Guide Technique

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6 TROUBLESHOOTING

PROBLEM
1) The compressor will not start
2) Display top temperature is not
sufficiently low
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LIKELY CAUSES
a) there is no electric current because
the automatic circuit breaker (or
fuse, if any), has been triggered
b) the main switch has not been ac-
tivated
c) the thermostat has been set too
high
d) there is a compressor overload due
to lack of condensation caused by
the condenser being blocked by
dust or other
a) the evaporator is blocked by ice
b) the condenser is blocked by dust
or other
c) lack of gas (the evaporator does not
defrost correctly)
d) the display unit is exposed to
draughts or to direct sunlight
e) the proper air flow is not reach-
ing the condenser (something,
e.g. sheets of paper, cloths, etc. is
blocking the condenser air passage
grille)
f) the thermostat is not functioning
regularly (with the refrigerating
system in perfect working order, the
thermostat intervenes before the set
temperature has been reached)
POSSIBILE SOLUTIONS
a) disactivate the automatic circuit
breaker (or replace the fuse)
b) enable the main switch
c) if the set temperature of the ther-
mostat is above that of the display
top, the compressor will not start.
Check the setting of the required
temperature (see Section 3.2) with
that of the current temperature
d) use the main switch to cut off the
power supply to the display unit;
clean the condenser fins as described
in Section 4.2, then reconnect the
power to the display unit
a) carry out defrosting as follows:
- Turn off the main switch for 10-12
hours in order to permit the evap-ora-
tor to defrost (see Section 4.4)
b) clean the condenser as indicated
in Section 4.2
c) call a qualified refrigeration engin-eer
to detect the cause of the gas leak .
When this has been solved, refill the
system in accordance with the type and
quantity of gas shown on the plate
d) the display unit will not function
in these circumstances: remove
it from any draughts and/or from
dir-ect sunlight
e) remove anything which is pre-
venting regular air flow to the
condenser
f) call a qualified refrigeration engin-
eer to replace the thermostat