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Customer Questions and Answers for Limit Switch (Primary) by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18032637
Manufacturer Part Number: WP74004530

Primary limit switch that interrupts the heating circuit when temperatures exceed safe limits to prevent overheating. Replacing this switch restores the appliance's temperature safety control and helps return normal heating behavior. What it does:

  • Monitors temperature and breaks power to the heating element when the preset limit is reached.
  • Acts as a safety cutoff to help prevent overheating and related damage.
  • A failed-open switch commonly causes no heat or intermittent heating.
  • A failed-closed switch can allow excessive heat or repeated thermal trips.
What's included: One primary limit switch. Install notes:
  • Disconnect power before servicing to avoid shock or injury.
  • Note terminal locations and wiring before removal; reconnect each wire to its original terminal.
  • Handle the part and terminals carefully to avoid damage; secure fasteners firmly but do not overtighten.

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Questions & Answers

For Whirlpool Limit Switch (Primary) (Part Number: OEM18032637)

1 Answer

Hello Frankie, This can be a harness issue, a bad door switch, or a bad interior light switch on the control panel. The oven lights automatically come on when the doors are opened. When the doors are closed, press the LIGHT pad (upper or lower oven) on the control panel to turn the lights on or off. This switch 74008717 could be bad.

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1 Answer

Willie, The limit switch would be a safety to make sure that the oven does not overheat. You will want to test the limit switch for continuity and make sure that it has continuity. If no continuity then the part is bad and would need to be replaced. You will also want to check to make sure that the control board is sending power to the bake and broil elements.

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1 Answer

Hello Davey, This device has no polarity. In other words, it's like a fuse in the sense that the circuit doesn't care which way it's installed. You can hook it up either way and it will work just fine.

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