M.C. Enterprises 31094MC Aftermarket RV Furnace Air Flow Sail Switch

Replaces Dometic™ / Atwood 31094

Part Number: 31094MC
Manufacturer: M.C. Enterprises
Product Type: Furnace Low Air Flow Switch (Sail Switch)
Application: Dometic™ / Atwood AFSD, AFMD, AFLA & AFLD Furnaces

Product Overview

The M.C. Enterprises 31094MC RV Furnace Air Flow Sail Switch is a direct aftermarket replacement for Dometic™ / Atwood OEM Part 31094.

Also referred to as a low air flow switch, this sail switch monitors blower airflow and prevents ignition unless proper air movement is detected inside the combustion chamber. If adequate airflow is not present, the furnace will not ignite — protecting the system from unsafe combustion conditions.

If your RV furnace blower runs but the burner does not light, ignition is intermittent, or heating cycles prematurely shut down, a faulty sail switch is often the cause.

The 31094MC provides a dependable, cost-effective replacement solution for compatible AFSD, AFMD, AFLA, and AFLD furnace models.

Key Features

• Aftermarket replacement for Dometic™ / Atwood 31094

• Verifies blower airflow before ignition

• Helps fix “blower runs but no heat” issues

• Restores proper ignition sequencing

• Direct-fit compatibility for listed furnace models

• Cost-effective alternative to OEM

Compatible Furnace Models

AFSD Series

AFSD20111

AFMD Series

AFMD25111
AFMD25121
AFMD25131
AFMD25141
AFMD25151

AFMD30111
AFMD30121
AFMD30131
AFMD30141
AFMD30151

AFMD35111
AFMD35121
AFMD35131
AFMD35141
AFMD35151

AFLA Series

AFLA35211
AFLA35221
AFLA35231

AFLA40211
AFLA40221
AFLA40231

AFLD35111

AFLD Series

AFLD35121
AFLD35131

AFLD40111
AFLD40121
AFLD40121W
AFLD40131

Always verify your furnace model number and confirm it originally used part 31094 before ordering.

When Should You Replace the Sail Switch?

You may need to replace the sail switch if:

• Furnace blower runs but burner will not ignite
• Furnace attempts ignition but shuts down
• Heating is intermittent
• Airflow-related ignition lockout occurs
• Sail paddle is bent, stuck, or contaminated

The sail switch is one of the most frequently replaced RV furnace components.

Product Specifications

Manufacturer: M.C. Enterprises
Part Number: 31094MC
Replaces: Dometic™ / Atwood 31094
Component: Low Air Flow Switch (Sail Switch)
Application: AFSD, AFMD, AFLA & AFLD Series Furnaces
Type: Aftermarket Replacement

Frequently Asked Questions (FAQ)

Q: Is this an OEM Dometic™ part?
A: No. This is an aftermarket replacement manufactured by M.C. Enterprises.

Q: What does a sail switch do?
A: It confirms sufficient blower airflow before ignition.

Q: Will this fix a furnace where the blower runs but there is no flame?
A: A failed sail switch is one of the most common causes of that issue.

Q: How do I confirm compatibility?
A: Verify your furnace model number and check the original part number installed.