Dometic (Atwood) DFSD Furnace Sail Switch – Part #36160 (Replaces 33081)

Restore reliable safety sensing and improve furnace performance with the Dometic (Atwood) DFSD Furnace Sail Switch – Part #36160. Designed as an exact replacement for OEM part #36160 and superseding part #33081, this high-quality sail switch ensures proper airflow detection in your RV furnace — a critical safety component that tells the control board when sufficient airflow is present before allowing ignition.

A failing or stuck sail switch is a common cause of “furnace starts then shuts off,” “furnace won’t ignite,” or “fan runs but no heat” conditions. Replace it with this genuine fit part to restore dependable operation.

Key Features

• OEM Replacement – Part #36160
• Replaces older part #33081
• Ensures accurate airflow sensing for safe ignition
• Precision contacts and switch diaphragm for long life
• Designed to meet factory specifications for performance and safety
• Direct fit — no modifications required

Why Replace Your Sail Switch

The sail switch (also called an airflow or pressure switch) tells the furnace control board that the blower is moving enough air for safe operation. When it fails or sticks, the furnace may:

• Start then shut off prematurely
• Fail to ignite
• Show error codes related to airflow
• Run the blower without producing heat

Replacing a worn or faulty sail switch is one of the most effective repairs for common RV furnace airflow issues.

Compatible Models & Serial Requirements

This replacement sail switch is compatible with the following Dometic / Atwood RV furnace models when the furnace Serial Number is AFTER 72498929:

Dometic / Atwood AFS & AFSD Series
AFSAD12111, AFSD12111, AFSD16111, AFSD20111
AFSDA12121, AFSAD12121, AFSD16121, AFSD20121
AFSAD12131, AFSD12131, AFSD16131, AFSD20131
AFSAD12141, AFSD12141, AFSD16141, AFSD20141

Dometic / Atwood AFMD Series
AFMD16111, AFMD16121, AFMD16131, AFMD16141, AFMD16151
AFMD20111, AFMD20121, AFMD20131, AFMD20141, AFMD20151

Dometic / Atwood DFSD & DFSAD Series
DFSAD12111, DFSAD12121, DFSAD12131, DFSAD12141
DFSD12111, DFSD12121, DFSD12131, DFSD12141, DFSD12151
DFSD16111, DFSD16121, DFSD16131, DFSD16141, DFSD16151
DFSD20111, DFSD20121, DFSD20131, DFSD20141, DFSD20151

Important: Verify your furnace Serial Number is after 72498929 before ordering — this sail switch is designed for updated control board configurations used in these newer units.

What’s Included

• (1) Sail Switch – Part #36160
• Mounting bracket and terminals as required

Wire harness and other connections sold separately.

Frequently Asked Questions

What does a sail switch do in an RV furnace?
It detects airflow from the blower — only allowing the furnace to continue ignition when sufficient air is flowing, ensuring safe and efficient operation.

Can I install this myself?
Yes — basic RV furnace repairs like sail switch replacement can be done with common tools. Always disconnect propane and power before servicing and follow manufacturer instructions.

How do I know my furnace needs a new sail switch?
Symptoms include the furnace running the blower but never igniting, cycling on and off quickly, or error codes indicating airflow problems.