Component Testing; Bimetal Switches - KitchenAid KGST300 Technical Education

Before testing any of the components, perform
the following checks:
• The most common cause for control failure is
corrosion on connectors. Therefore, discon-
necting and reconnecting wires will be nec-
essary throughout test procedures.
• All tests/checks should be made with a VOM
or DVM having a sensitivity of 20,000 ohms-
per-volt DC, or greater.
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

BIMETAL SWITCHES

Refer to pages 4-2 and 4-8 for the procedure
for servicing the bimetal switches.
1. Turn off gas supply and disconnect power
to the range.
2. Disconnect one of the wires from the bi-
metal switch under test.
3. Set the ohmmeter to the R x 1 scale.
4. For the ambient bimetal switch (N.C.),
touch the ohmmeter test leads to the ter-
minals. The meter should indicate conti-
nuity (0 Ω).
5. For the cooling fan bimetal switch
(N.O.), touch the ohmmeter test leads to
the terminals. The meter should indicate
an open circuit (infinite).
6. For the cooktop bimetal switch (N.C.),
touch the ohmmeter test leads to the ter-
minals. The meter should indicate conti-
nuity (0 Ω).

COMPONENT TESTING

Electrical Shock Hazard
• Check all connections before replacing com-
ponents, looking for broken or loose wires,
failed terminals, or wires not pressed into
connectors far enough.
• Resistance checks must be made with power
cord unplugged from outlet, and with wiring
harness or connectors disconnected.
WARNING
Ambient Bimetal Switch (N.C.)
Opens @ 96°C (205°F)
Resets @ 74°C (165°F)
Cooling Fan Bimetal Switch (N.O.)
Resets @ 70°C (158°F)
Closes @ 60°C (140°F)
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