Troubleshooting - Jenn-Air JWC2450ARB Service Manual

Troubleshooting

!
WARNING
power to be connected. When removing any wiring from terminals they must be replaced on the same terminals.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
PROBLEM
Interior too cold or
contents freezing.
©2003 Maytag Appliances Company
CHECK
Thermostat setting
The evaporator for the
presence of a uniform
frost pattern. Is the frost
confined to left wing and
the left side of the back?
Note: Compressor should
be operating for least 5
minutes with door open to
perform this check.
Thermostat (compressor
control) thermo bulb
mounting or routing.
16022323 Rev. 0
To avoid risk electrical shock, personal injury, or death,
always disconnect electrical power source to the freezer
before attempting to service, unless test procedures require
POSSIBLE CAUSE
Thermostat set to too cold
of a setting for ambient
conditions.
Refrigerant leak or low
refrigerant charge in the
sealed system.
Refrigerant volume in
evaporator is not sufficient
to cool the region of the
plate where the
evaporator plate sensing
thermostat's thermo bulb
mounts. Therefore the
control thermostat never
reaches its cutout
temperature and the
compressor operates
100% of the time. The
remaining evaporator
volume is sufficient to cool
the air temperature below
freezing.
Mounting location
incorrect. Model should be
on the right wing of the
evaporator plate. All other
models mount at the rear
top center of the
evaporator.
Thermostat sensing tube
(capillary tube) resting on
or above compressor
dome in mechanical
compartment causing
false sensing.
Thermostat thermo bulb
mounting bracket not
secure, causing false
sensing.
Insufficient thermo bulb
contact area on
evaporator U-shaped loop
with 3-inch long legs
required. Bracket should
be located at mid point of
each 3-inch leg. Both legs
secured under bracket.
REMEDY
Adjust thermostat warmer
setting (lower number on
knob).
Locate and correct cause
of refrigerant leak.
Replace drier, evacuate
and recharge sealed
refrigerant system with the
proper amount of charge
as listed on the unit's data
plate.
Relocate thermo bulb to
proper location.
Reroute sensing tube
clear of compressor dome
area.
Securely tighten thermo
bulb mounting bracket.
Adjust thermo bulb contact
area to achieve sufficient
contact. A U-shaped loop
with 3-inch long legs is
required. The mounting
bracket should be located
at the mid-point of each 3-
inch leg. Both legs
secured under bracket.
9