58
Dometic
®
MANUAL
Refrigerators
P1
P2
P3
Thermistor
unplugged
from PC
Board
The switching of relays from converter power to
battery power when unplugging from shore power
or shutting down of the generator could interrupt
DC power long enough to cause a check light.
The thermocouple produces 25–35 MVDC when
operating. When DC power is interrupted and restored,
the thermocouple may not have sufficient time to cool.
If the power module sees above 6 MVDC, when power
is restored the power module will assume a problem in
the gas mode and immediately turn on the check light.
The operational range of the unit is a minimum of 9.6V
DC to a maximum of 22V DC. At 22V DC, the unit will
automatically shut down until voltage has decreased to
18V DC for proper operation; however, the panel lights
will continue to illuminate until voltage has dropped to 4V
DC or below.
Connecting the refrigerator to an unregulated converter
can result in improper operation of the refrigerator. Do
not use the body or chassis of the RV as a substitute for
either or the two conductors. Proper polarity is crucial for
refrigerator operation. Check for proper DC voltage at
the positive and negative terminals at the back of the
unit. If the voltage is outside the operational range,
correct the power supply problem.
8E. DC COMPONENTS
THERMISTOR
To determine if the thermistor is functioning properly,
perform the following test.
Remove the cover from lower circuit board. Disconnect
the thermistor harness from the P2, 2-pin terminal on the
lower circuit board. Place the thermistor in a glass of ice
water, approximately 33°F to 35°F. Wait 2 to 3 minutes.
Using a properly calibrated ohm meter, place a probe on
each terminal point. You should get a reading of approxi-
mately 7,000 to 10,000 ohms. Normal failure for this
type of device is to have a very high resistance. A
defective thermistor could cause an over-cooling condi-
tion on all modes.
NEVER use a thermistor adjuster or a thermistor for
any other model of refrigerator. Either of these can
cause an over-cooling problem similar to manual
mode of operation.
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