Dometic
®
MANUAL
Refrigerators
53
D. GAS MODE: NOTE: The PAL tester will allow for
proper testing of the integrity of the upper and lower
circuit boards. PAL is available from your Dometic
parts distributor.
ALL TESTS ARE TO BE DONE WITH THE RE-
FRIGERATOR IN THE COOLING MODE.
Before checking the circuit board for gas operation,
verify that the following components are good: Upper
Circuit Board, Thermistor
and 3 Amp Fuse.
NOTE: Each of the following tests should be
done according to pin locations. The wire colors
may vary.
First, check for voltage during trial-for-ignition
(approximately 45 seconds) at Plug 3, Terminals 1
(white wire) and 2 (yellow wire) to the solenoid. If no
voltage is present, change the circuit board. If voltage
is present, check for voltage at the solenoid. If
voltage is not present, check the wires and connec-
tions.
Next, check for voltage to the igniter. If no voltage is
present, check the wires. If good, then change the
circuit board. If voltage is present, this portion of the
board is good.
NOTE: When millivolts to the lower circuit board are
10 ± 3, the power to Plug 3, Terminal 4 (blue wire)
will be shut off. If flame extinguishes during the
cooling mode, the circuit board will not supply voltage
to Plug 3, Terminal 4 (blue wire) again until the
millivolts have decreased to 10±3. This process could
take up to 15 seconds or longer.
To check the flame sense circuit of the lower circuit
board, operate the refrigerator on GAS mode, then
measure the millivolts between J3 terminal and the
other wire connection from the thermocouple. The
millivolt meter should read between 25 to 35 millivolts
with the gas flame burning. Next, turn the manual
shutoff valve to OFF and watch the millivolt reading
as it drops. Note the millivolt reading when Plug 3,
Terminal 4 (blue wire) receives power. It should be
10± 3 millivolts or 7 to 13.
Repeat this test several times. If the igniter fails to
spark on any test sequence, it should be replaced.
If the millivolt readings vary more than 1 to 2 MV
from one test to the other when power is supplied to
Plug 3, Terminal 4 (blue wire), replace the lower
circuit board.
NOTE: Verify all connections are clean and tight
before replacing either component.
DOOR SWITCH (Only on Models Equipped
with Interior Lights)
The door switch is an open switch when the switch arm
is depressed (interior light should be off). When the
refrigerator 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 assembly 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 assem-
bly is wired properly per the wiring diagram.
When the switch arm is depressed, there should not be
continuity. When the switch arm is NOT depressed,
there should be continuity. If any of these checks are
incorrect, replace the switch.
FUSES
The fuses are to protect the circuit board and the
integrity of the heater circuit(s) against shorts.
The 3 amp DC fuse is designed to protect the circuit
board from internal shorts. The 5 amp AC fuse is
designed to protect the integrity of the AC heater circuit
from shorts. On 3-way models only, the 35 amp DC
fuse is designed to protect the DC heater circuit integ-
rity.
To check the fuses, remove from the holder and do a
continuity check. If no continuity, replace with a proper
amperage fuse.
NOTE: Determine the cause of the fuse failure and
correct before replacing fuse.
CLIMATE CONTROL HEATER
The climate control is a switch operated DC electric
heater. Its primary function is to warm the frame of the
refrigerator during high temperature/high humidity
conditions. This prevents the formation of condensation
on the metal frame.
To check the switch, disconnect the wires 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, do an ohms resistance
reading on the heater wire by using a properly calibrated
ohm meter. The proper ohms reading is 24 ohms ± 10%.
The approximate amp draw is less than .5 (1/2) amp.
NOTE: The climate control will draw DC power continu-
ously. It should be turned off when charging source is
not available.
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