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Customer Questions and Answers for High-Limit Thermostat (Inlet) by Whirlpool

4.89 (64)
By: Whirlpool
Part Number: OEM18040590
Manufacturer Part Number: WP8577891

This safety thermostat monitors temperature at the dryer's air inlet and opens the heater circuit if temperatures climb too high. Replacing a failed unit restores proper heat control and helps protect the dryer from overheating damage. What it does:

  • Senses inlet air temperature and interrupts power to the heater when a high limit is reached
  • Helps prevent overheating and repeat thermal fuse failures due to restricted airflow
  • Failure symptoms include no heat, intermittent heat, very hot cabinet, or a burnt odor
  • Supports consistent drying performance by maintaining safe operating temperatures
What's included:
  • 1 thermostat
Install notes:
  • Disconnect power; turn off gas supply for gas models
  • Thermostat is typically mounted on the inlet duct or near the heater/blower housing; refer to your model's diagram for location
  • Move wires one at a time to the new thermostat; reuse existing mounting hardware
  • After replacement, clean the lint path and verify proper vent airflow to prevent repeat failures

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Questions & Answers

For Whirlpool High-Limit Thermostat (Inlet) (Part Number: OEM18040590)

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Answer

Hello Trent, The first thing that you will want to check is venting to make sure that the vent from the blower wheel to the outside of home. If the vent is clogged it will cause an issue where the unit will not be able to exhaust the moisture and will cause longer drying times.

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Answered by AppliancePartsPros.com   |   Tuesday, February 26, 2013

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