Atwood / Dometic 31077 Furnace Burner Orifice – #49LP (Special Order)

Atwood / Dometic 31077 Furnace Burner Orifice (#49LP)

The Atwood / Dometic 31077 Furnace Burner Orifice is a precision gas metering component designed for Atwood RV furnaces. This #49LP propane orifice regulates the amount of LP gas flowing into the furnace burner assembly, ensuring proper combustion and efficient furnace operation.

If your RV furnace is experiencing weak flames, ignition problems, delayed ignition, or poor heating performance, the burner orifice may be clogged, damaged, or worn, making replacement necessary.

This part is a direct replacement for Atwood furnace burner orifices used in many models and restores the correct fuel-to-air mixture required for safe furnace operation.

⚠️ Special Order Item – Ships in 7–14 days

Features

• Genuine Atwood / Dometic replacement part
• #49LP propane burner orifice
• Ensures proper LP gas flow to the burner assembly
• Helps restore correct flame size and heating performance
• Precision-machined for reliable combustion
• Designed for Atwood RV furnace systems

Common Symptoms of a Faulty Burner Orifice

You may need to replace the burner orifice if your furnace shows these symptoms:

• Weak or inconsistent burner flame
• Furnace ignites but produces little heat
• Delayed ignition or burner flame issues
• Furnace shuts down after ignition attempt
• Propane burner not receiving proper gas flow

In many cases, the orifice becomes clogged with debris, oil residue from propane, or corrosion, restricting gas flow.

FAQ

What does the furnace burner orifice do?

The burner orifice regulates the amount of propane entering the burner assembly, creating the correct air-fuel mixture needed for efficient furnace combustion.

Can a burner orifice be cleaned instead of replaced?

Sometimes minor debris can be cleaned, but orifices are precision sized. If they are damaged, corroded, or enlarged, replacement is recommended.

What does “#49LP” mean?

The #49 refers to the orifice drill size, which determines the precise amount of propane delivered to the burner.

How do I know if my RV furnace burner orifice is clogged?

Signs include weak flames, delayed ignition, furnace cycling, or poor heating output.