Dometic / Atwood 31091 Furnace Limit Switch

Dometic / Atwood 31091 Furnace Limit Switch

Genuine OEM Replacement

Part Number: 31091
Product Type: Furnace Limit Switch
Application: Atwood & Dometic RV Furnaces

Product Overview

The Dometic / Atwood 31091 Furnace Limit Switch is a genuine OEM safety component designed to protect your RV furnace from overheating. The limit switch monitors internal furnace temperature and automatically shuts off the burner circuit if temperatures exceed safe operating limits.

If your furnace is cycling improperly, shutting down unexpectedly, or failing to stay lit, a faulty limit switch may be the cause. Replacing it with OEM Part 31091 restores safe operation and prevents potential heat damage to the unit.

Manufactured to original equipment specifications, this high-limit switch ensures accurate temperature response and dependable performance across a wide range of Atwood and Dometic furnace models.

Key Features

• Genuine OEM Dometic / Atwood replacement part
• High-limit safety switch
• Protects against overheating
• Automatically interrupts burner circuit at unsafe temperatures
• Direct OEM replacement for listed models
• Built to original equipment standards

Compatible Furnace Models

Part 31091 is compatible with the following furnace series:

AFLA Series

AFLA35211
AFLA35221
AFLA35231
AFLA40211
AFLA40221
AFLA40231

AFLD Series

AFLD35111
AFLD35121
AFLD35131
AFLD40111
AFLD40121
AFLD40131

AFMD Series

AFMD16111, AFMD16121, AFMD16131, AFMD16141, AFMD16151
AFMD20111, AFMD20121, AFMD20131, AFMD20141, AFMD20151
AFMD25111, AFMD25121, AFMD25131, AFMD25141, AFMD25151
AFMD30111, AFMD30121, AFMD30131, AFMD30141, AFMD30151
AFMD35111, AFMD35121, AFMD35131, AFMD35141, AFMD35151

AFSAD Series

AFSAD12111
AFSAD12121
AFSAD12131
AFSAD12141

AFSD Series

AFSD12111, AFSD12121, AFSD12131, AFSD12141
AFSD16111, AFSD16121, AFSD16131, AFSD16141
AFSD20111, AFSD20121, AFSD20131, AFSD20141

AFSDA Series

AFSDA12121

DFLA Series

DFLA35211
DFLA35221
DFLA35231
DFLA40211
DFLA40221
DFLA40231

DFLD Series

DFLD35111
DFLD35121
DFLD35131
DFLD40111
DFLD40121
DFLD40131

DFMD Series

DFMD16111, DFMD16121, DFMD16131, DFMD16141, DFMD16151
DFMD20111, DFMD20121, DFMD20131, DFMD20141, DFMD20151
DFMD25111, DFMD25121, DFMD25131, DFMD25141, DFMD25151
DFMD30111, DFMD30121, DFMD30131, DFMD30141, DFMD30151
DFMD35111, DFMD35121, DFMD35131, DFMD35141, DFMD35151

DFMDH Series

DFMDH25111
DFMDH25121
DFMDH30111
DFMDH30121
DFMDH35111
DFMDH35121

DFSAD Series

DFSAD12111
DFSAD12121
DFSAD12131
DFSAD12141

DFSD Series

DFSD12111, DFSD12121, DFSD12131, DFSD12141
DFSD16111, DFSD16121, DFSD16131, DFSD16141
DFSD20111, DFSD20121, DFSD20131, DFSD20141

DFSDH Series

DFSDH20111
DFSDH20121

Always verify your furnace model number before ordering to ensure compatibility.

When Should You Replace the Limit Switch?

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

• Furnace shutting down shortly after ignition
• Furnace blower running but no burner operation
• Repeated short cycling
• Diagnostic testing confirms failed high-limit switch

The limit switch is a critical safety device and should be replaced with an OEM specification component.

Product Specifications

• Manufacturer: Dometic / Atwood
• Part Number: 31091
• Component: High-Limit Switch
• Function: Overheat protection
• Application: Compatible Atwood & Dometic furnace models listed above

Frequently Asked Questions (FAQ)

Q: What does a furnace limit switch do?

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

Q: Will a bad limit switch cause the furnace to short cycle?

A: Yes. A faulty or weak limit switch can cause repeated cycling or shutdowns shortly after ignition.

Q: Is this an OEM Dometic / Atwood part?

A: Yes. Part 31091 is a genuine OEM replacement component.

Q: Does this fit both AF and DF series furnaces?

A: Yes. It fits compatible AFLA, AFMD, AFSD, DFMD, DFSD, DFLA, DFLD and related series listed above.