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SYMPTOM
Compressor does not work
U KL = 0 Volts
U KL < U ON
Start attempt with U KL < U ON
Start attempt with U KL > U ON
Compressor does not operate
with electronics
Interruption in compressor's
electronic system between
the pins
Interior temperature too low at thermostat setting 1
Compressor runs constantly
Compressor runs too long
Compressor running time normal
LEGEND
U KL . . . . Voltage between positive and negative terminal
of electronics
U ON . . . Switch-on voltage at terminal of electronics
U OFF . . . Switch-off voltage at terminal of electronics
TROUBLESHOOTING
RESULT
Interruption in connection line
of the battery / electronics
Main switch is defective
Additional line fuse is blown
Battery voltage is too low
Loose cable connection / poor contact (corrosion)
Cable cross section too small
Battery capacity too low
Ambient temperature is too high
Insufficient air inlet and outlet
Dirt build-up in condenser
Fan defective
Electronics defective
Compressor defective
Thermostat sensor has no contact at evaporator
Thermostat line short-circuited
Thermostat defective
Large quantity frozen in evaporator compartment
Refrigerating chamber is too small
CORRECTIVE ACTION
Load battery
Replace battery
Replace electronics
Replace compressor
Secure thermostat
Replace thermostat
Shield evaporator from
refrigerating chamber
WAECO USA • Page 7
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