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Customer Questions and Answers for Thermostat Spst (Upper) by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18028209
Manufacturer Part Number: WP4450934

This upper SPST thermostat is a single-pole temperature switch that helps control heating by opening the circuit at a set temperature. It restores proper temperature cycling and acts as an over-temperature safety device. What it does:

  • Opens/closes the heating circuit at its set temperature to regulate heat output.
  • Functions as an upper-limit/safety thermostat to help prevent overheating.
  • Common symptoms of failure: no heat, intermittent heating, or continuous heating despite controls.
  • Used where an upper-temperature cutoff is required to maintain safe operation.
What's included: One upper SPST thermostat. Install notes:
  • Disconnect power to the appliance before servicing to avoid shock or injury.
  • Compare wiring and mounting orientation to the original part before removal.
  • Confirm failure with a multimeter (continuity check) before replacing the thermostat.

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Questions & Answers

For Whirlpool Thermostat Spst (Upper) (Part Number: OEM18028209)

1 Answer

Jock, Once the screws have been removed from the side trim you will pull down and out on the trim, and possibly use a small flat blade to pry the bottom out. Once you do this and pull down the trim should come off and then there will be screws holding the unit into the cabinet. Remove these screws and you will be able to remove the unit from the cabinet.

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1 Answer

Hello Amon. Make sure the sensor is good and if so, you will need to replace the control board on the unit.

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1 Answer

Bill, WIth the issue that is going on, this issue would most likely be caused by a faulty control board for the unit.

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1 Answer

Carlton, This is the correct part per the manufacturer. What you would need to do is get a male spade and terminate the female spade on the wire and install the male spade to connect to the thermostat.

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1 Answer

Hello Paul. Yes, you will disconnect the power first. Then remove the screws securing the oven in place. Pull the oven out, and remove the back panel on the back of the oven. Once removed, you will see and access the thermostat WP4450934. Reinstall in reverse order. Hope this helps.

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