Potentiometer Removal And Replacement - Thermador Pro Harmony PRL364GDH/01 Service Manual

6.3.7

Potentiometer Removal and Replacement

The potentiometer (also known as the Simmer Control potentiometer
or XLO potentiometer) is used to control the simmer function of the
XLO burners (left front and left rear burners).
NOTE: The potentiometer should not be confused with the
Temperature Selector, which is sometimes also referred to as a
potentiometer.
1. Follow all safety precautions and steps in Preparing the Range for
Servicing, page 19.
2. Follow all steps in Accessing Components under the Maintop,
page 19.
3. Remove knob from valve stem by slowly pulling knob straight out,
away from control panel.
4. While using a 1/2 inch wrench to hold the nut on the solenoid
valve, unscrew the gas tube hex nut with a 9/16 inch wrench.
Then unscrew the other side of the gas tube attached to the jet
holder assembly and remove the gas tube. Be careful not to bend
the gas tube (see Figure 52).
5. Remove the burner support rail (with jet holder assemblies
attached) by following the steps in Burner Support Rail Removal
and Replacement, page 25.
6. First make a note of how the wires are connected to the solenoid
valve terminals, and then remove the wires from the terminals.
NOTE: It is always recommended to label and tag all wires and
harnesses prior to disconnecting them, so as to correctly identify
their connections/locations when reassembling.
HINT: Alternatively, you can photograph the wire connections
prior to disconnecting (for example, with your mobile phone).
7. Using an adjustable wrench, unscrew the large hex nut on the
solenoid and remove the solenoid valve from the XLO valve. Be
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Service Manual for the Thermador Pro Harmony Range, Model PRL364GDH/01
careful not to lose the plastic O ring positioned inside the large
hex nut of the solenoid valve, as it may fall out easily
(see Figure 53).
8. Using a 1/4 inch socket wrench/ratchet, remove and retain the
self-tapping screw located under the manifold that secures the
XLO valve onto the manifold (see Figure 49). Be careful not to
lose the rubber washer attached to the screw.
-OR-
Using a 1/4 inch nut driver, remove and retain the self-tapping
screw by accessing it from under the chassis base, through the
corresponding access hole (the oven door must be opened or
removed) - see Figure 49. Be careful not to lose the rubber
washer attached to the screw.
9. Gently lift the protruding part of the XLO valve out of the
receptacle on the manifold (don't lose the red rubber washer
attached to the XLO valve), and slightly bring out the (connected)
XLO valve/potentiometer assembly from under the front panel. Be
aware of the side connector that is attached.
10. Remove the white plastic side connector from the potentiometer
by pressing on the connector's tab. (see Figure 55).
11. Detach the XLO valve from the potentiometer by using a small
flat-blade screwdriver to remove the XLO valve from the
potentiometer standoffs. Then slide the potentiometer off the valve
stem (see Figure 56).
12. Replace the potentiometer if needed.
Gas Leaks
Carefully check for gas leaks at each gas component that was
removed, replaced, or otherwise serviced using a gas leak detector or
bubble test.
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