Door Switch; Climate Control Heater & Switch; Low Ambient Switch; Fuses - Dometic RM2351 Diagnostic Service Manual

5.10 door Switch

The door switch is an open switch when the switch arm
is depressed (interior light should be off). When the re-
frigerator door is open the switch is closed (interior light
should be on). Check that the switch assembly is properly
aligned and that it is not broken. Check the switch as-
sembly for continuity. To do a continuity check, first be
sure all power is disconnected or OFF to the refrigerator.
Second, remove all wires from the switch assembly, then
check the switch.
After the check, be sure the switch assembly is wired
properly per the wiring diagram. When the switch is de-
pressed, there should not be continuity. When the switch
is NOT depressed, there should be continuity. If any of
these checks are incorrect, replace the switch.
5.11 climate control Heater & Switch
Not used on all units. Disconnect the wires from the
switch and do a continuity check. In the OFF position,
there should be no continuity. In the ON position, there
should be a continuity reading. To check the heater itself,
perform an ohms resistance reading on the heater wire by
using a properly calibrated ohm meter. From the side of
the switch that only has two wires, with switch off take an
ohms reading to ground. The proper ohms reading will be
24 ohms ± 10%. The approximate amp draw is less than
.5 (1/2) amp.
function
During the summer months of high temperatures and
humidity, the metal frame between the freezer and fresh
food compartments may have water droplets forming. The
number of water droplets will increase if the vehicle isn't
air conditioned during these months. Some refrigerators
come standard with a 12 volt (DC) climate control that
will evaporate the water droplets when they form. To have
the climate control on, you position the switch (normally
located beneath the top decoration panel that houses the
control panel) to ON. The approximate amp draw is less
than .5 (1/2) amp.
note: The climate control will draw 12 volt DC power
continuously when in the ON position on certain models.
It should be turned OFF when a charging source is not
available or unit is in storage.

5.12 low ambient Switch

Not used on all units. Disconnect the wires and do a con-
tinuity check. In the OFF position, there should be no
continuity. In the ON position, there should be a continu-
ity reading. All RV absorption refrigerators, while similar,
operate a little differently than your home refrigerator. Do-
metic designers and engineers have equipped your re-
frigerator with an exclusive feature that allows for trouble-
free operation in low ambient temperature ( below 50° F)
for extended periods of time. Simply turn on the low ambi-
ent switch located beneath the top decoration panel that
houses the control panel. Once the outdoor temperature
is above 50° F, the low ambient switch should be turned
off.
When the low ambient control is turned on it by-passes
the interior light switch and turns on the interior light. The
heat load of the 10 watt light bulb will cause the cooling
unit to cycle approximate every 35 to 55 minutes. This will
help keep the temperature in the freezer in the freezing
zone. In low ambient temperatures the freezer will warm
up because the refer box will not call for much cooling.
When the refer calls for cooling it will cool the freezer first
and then cool the refer box. When it is cool outside the
refer box won't call for as much cooling and the freezer
might warm up to normal food storage temperature (34
to 35). The second thing the control will do is keep the
cooling unit from freezing up in low outdoor temperatures.
(20 to 0 F)

5.13 fuses

The 3 amp DC fuse is designed to protect the circuit board
from internal/external DC shorts. The 5 amp AC fuse is
designed to protect the integrity of the AC detection and
heater circuit from shorts. On 3-way models only, the 30
or 35- amp DC fuse is designed to protect the DC heater
circuit integrity. All fuses can be checked for continuity. If
a fuse blows don't replace it until the problem has been
found. If a fuse blows there is a short or component that
has created the problem.

5.14 thermofuse

Newer and replacement cooling units have a Thermofuse
located on the boiler. The function of the thermofuse is
to shut down the control system in the event the cooling
unit has a problem. On certain units the fuse can be reset
by pushing the button in the center. The thermofuse is a
non-replaceable component of the cooling unit. When the
fuse pops it is normally an indication the cooling unit has
a problem and the cooling unit will have to be replaced.
The fuse can be checked for continuity .
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