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Infinite Switch Testing:

An infinite switch allows the user to set the heat from low to high and everywhere in between, hence the name "Infinite." This switch differs from a "Low-Medium-High" switch, which provides only three heat settings. The infinite switch uses a bimetal switch and physically moves through the process of heating and cooling, causing the main switch contacts to open and close and controlling the power applied to the heating elements.Typically, when an infinite switch malfunctions, the surface element will not heat, or it will remain on high in every position.

  1. Before repairs or testing can begin, you must disconnect the electricity at the fuse panel, at the circuit breaker panel, or by pulling the plug. Make sure the power is off before proceeding. A jolt from 220 volts can be fatal, use caution!.
  2. Next, depending on your appliance type/model, access the infinite switch using one of the following methods:
    1. For most standard models, remove the back panel.
    2. On models with front-mounted controls, the panel is attached with screws on both ends. Remove the screws and tilt the control panel, being careful not to let the wires disengage from the components.
    3. For models with a removable backsplash, simply lift the backsplash, rest it on the cooktop and remove the screws to access the components.
    4. If you are working on an eye-level range or wall oven, remove the control panel by opening the door and removing the screws that secure it. The screws may be located under the front of the exhaust hood or below the control panel. If the control panel is hinged, tilt the control panel towards you.
    5. Some models will require that you remove the rear panel and front panel before work can begin.
    6. If the front control panel is glass, remove the screws securing the trim that holds the glass in place.

Test for continuity between the switch contacts:

  1. Remove all wires from the switch terminals. (Remember to label them!)
  2. Set the infinite switch on high and place your ohmmeter on the L2, H2, P and H1 terminals to check for continuity.
    1. If there is no continuity between L1 and H1 or between L2 and H2, the infinite switch is defective.
    2. If there is no continuity between P and H1, the indicator light circuit is defective.
  3. Remove the infinite switch by removing the screws or nuts that hold it in place and install a new infinite switch by following the disassembly instructions in reverse order. Be sure to follow the wiring diagram and install the wires to the correct terminals.