12 - Fault fi nding chart
Fault Possible cause Action
Fridge not cold.
Compressor will not start.
No power supply. Battery
in poor condition. Faulty
thermostat. Faulty electronic
unit.
Check that power is present at terminal box,
check fuse. Internal light working? Check all
terminal connections and cables. Inspect battery
charging system. Check thermostat. Bridge T-C,
if compressor start, thermostat is faulty, replace.
If compressor does not start, probably electronic
unit is faulty. Exchange electronic unit.
Compressor makes only
short start attempts.
Bad power supply, too
low voltage drop at start
attempts. Discharged
batteries.
Check cables and connections, possible
verdigris, clean. Charge batteries, run the engine
or connect battery charger. Voltage shall be
above 11.0 volt at start attempts.
Compressor runs but no
refrigeration generated.
Loss of refrigerant. Leakage
in pipes or evaporator. Pipes
blocked.
Leak test, repair possible leak, evacuate
(vacuum) an re-fi ll refrigerant. (All this must be
made by refrigeration specialist)
Compressor runs long time
but not generating enough
cold.
Bad ventilation. Condenser
too warm. Fan not
working. Too much frost on
evaporator. Door not closing
well. Condenser blocked by
dirt and dust.
Improve ventilation for compressor.
Re-place fan.
Defrost.
Check door position and door seal.
Clean condenser.
System voltage Cut-out volt Cut-in volt
12 9,6 10,9
24 21,3 22,7
11 - Battery protection
To protect the batteries form becoming completely discharged, a battery voltage sensor switches off the
compressor automatically at the following levels:
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