Dometic / Atwood 37022 Furnace Limit Switch – 8500-III / 8500-IV / 8500 LD

Dometic / Atwood 37022 Furnace Limit Switch – 8500-III / 8500-IV / 8500 LD

Genuine OEM Replacement

Part Number: 37022
Product Type: Furnace Limit Switch (High Temperature Safety Switch)
Application: Atwood 8500-III, 8500-IV & 8500 LD Series Furnaces

Product Overview

The Dometic / Atwood 37022 Furnace Limit Switch is a genuine OEM high-temperature safety switch designed for select Atwood 8500-III, 8500-IV, and 8500 LD series furnaces.

This limit switch monitors internal furnace temperature and automatically interrupts burner operation if temperatures exceed safe operating levels. It plays a critical role in protecting the heat exchanger and preventing furnace overheating.

If your furnace ignites but shuts down quickly, short-cycles once heated, or fails to maintain burner operation, a faulty limit switch may be the cause. Replacing it with OEM Part 37022 restores proper safety protection and reliable heating performance.

Manufactured to original equipment specifications, this component ensures correct temperature calibration and dependable fitment.

Key Features

• Genuine OEM Dometic / Atwood replacement part
• High-limit overheat safety switch
• Designed for 8500-III, 8500-IV and 8500 LD series
• Protects furnace from excessive internal temperatures
• Restores safe and reliable heating operation
• Manufactured to original equipment standards

Compatible Furnace Models

Part 37022 is compatible with:

8500-III Series

• 8516-III
• 8520-III
• 8525-III
• 8531-III
• 8535-III

8500-IV Series

• 8516-IV
• 8520-IV
• 8525-IV
• 8531-IV
• 8535-IV

8500 LD Series

• 8516-LD
• 8520-LD
• 8525-LD
• 8531-LD
• 8535-LD

Always verify your furnace model on the unit data plate before ordering to ensure compatibility.

When Should You Replace the Limit Switch?

You may need to replace the limit switch if you experience:

• Furnace shutting off shortly after ignition
• Repeated short cycling
• Blower running but burner not staying lit
• Overheat diagnostic condition
• Confirmed failed switch during electrical testing

The limit switch is a critical safety device and must match your furnace model and calibration.

Product Specifications

• Manufacturer: Dometic / Atwood
• Part Number: 37022
• Component: High Limit Safety Switch
• Application: 8500-III, 8500-IV & 8500 LD Series
• Includes: Limit switch only

Frequently Asked Questions (FAQ)

Q: What does a furnace limit switch do?

A: It protects the furnace from overheating by shutting off burner operation if temperatures exceed safe operating limits.

Q: Will this fit 8500-II furnaces?

A: This listing is specifically for 8500-III, 8500-IV, and 8500 LD series models. Always confirm your exact furnace model.

Q: Can a bad limit switch cause cycling issues?

A: Yes. A weak or faulty limit switch can cause the furnace to ignite and then shut down prematurely.

Q: Is this an OEM Dometic / Atwood part?

A: Yes. 37022 is a genuine OEM replacement component.