Atwood Furnace Reset Switch: How It Works and Troubleshooting Tips – Accelerate Net Zero

An Atwood furnace keeps RV interiors warm during travel and camping, but a trip or failure to ignite can disrupt comfort. The reset switch is a safety feature designed to stop gas flow and allow the system to recover after detecting faults. Understanding how the reset switch works, where it is located on different Atwood models, and how to perform a safe reset can help RV owners restore heat quickly while avoiding unsafe conditions. This guide covers the reset switch principles, common causes of trips, and practical steps for diagnosis and reset.

How The Atwood Furnace Reset Switch Works

Atwood furnaces rely on a gas valve, an ignition system, and a draft inducer to ignite a flame and heat the living space. The reset switch provides a manual restart point after the system detects instability, overheating, or flame loss. When tripped, it interrupts power to the burner circuit, preventing continued gas flow until the fault is cleared. On most Atwood models, the reset button is small, red or yellow, and located behind an access panel or near the control board.

Resetting the unit does not fix underlying problems such as a dirty burner, blocked vent, or a faulty flame sensor. If issues recur, continued resets can create hazardous gas buildup or carbon monoxide exposure. Always ensure detectors are functioning and vents are clear before attempting a reset, and follow the exact steps for your model to avoid injury or equipment damage.

Common Symptoms That Indicate A Reset Is Needed

• The furnace makes a series of clicking sounds or hums but won’t ignite.
• An LED indicator blinks in a pattern that signals a fault code.
• The reset button pops out or requires manual activation to proceed.
• The system overheats or trips the high-limit switch.
• No heat is produced after ignition attempts.
• There is an unusual odor of gas or visible soot around the furnace area.

Step-By-Step Reset Procedure

1. Turn off the furnace switch and shut off the gas supply to stop fuel flow.
2. Wait 5 to 10 minutes to allow pressures to equalize and the safety switch to reset.
3. Locate the reset button on the furnace control panel or inside the access panel. Press and hold the button for 5 to 10 seconds until it clicks and remains in.
4. Release the button, restore gas supply, and switch the furnace back on. Set the thermostat to heat mode and observe for ignition.
5. If ignition occurs, allow the furnace to run for several minutes while monitoring flame stability and venting.
6. If ignition fails or the reset trips again, do not repeatedly reset. Proceed with diagnostic checks or consult a professional to prevent unsafe conditions.

Safety Checks Before And After Reset

• Ensure the area around the furnace is well-ventilated and CO detectors are functional.
• Check for actual gas odor. If gas is detected, evacuate and call emergency services immediately.
• Inspect venting and exhaust paths for blockages, snow, or debris that could cause poor draft.
• Verify that the thermostat and wiring are in good condition and that the fuel supply valve is fully open after reset.
• Never reset in a closed space where a CO buildup could occur. If you are unsure, stop and seek professional assistance.

Common Causes Of Repeated Reset Trips

• Dirty flame sensor or ignition electrode causing unreliable ignition.
• Blocked or restricted venting, intake, or exhaust ducts.
• Faulty pressure switch or draft inducer that misreads airflow.
• Dirty or clogged burner leading to incomplete combustion.
• Low gas pressure or fuel supply issues, including valve restrictions.
• Faulty limits or safety switches that trip prematurely.
• Wiring faults or control board hiccups that create intermittent faults.

Maintenance To Prevent Future Trips

• Schedule periodic cleaning of the burner, flame sensor, and ignition electrodes to maintain reliable ignition.
• Inspect and clear vent paths, flues, and exterior vents to ensure proper draft.
• Replace or clean air filters and check cabin filters to reduce strain on the furnace blower.
• Test CO detectors regularly and replace batteries as needed; install detectors in the RV as directed by local codes.
• Have a professional perform an annual service check, including gas pressure testing and electrical system inspection.

Model Variations And Reset Button Locations

While most Atwood RV furnaces use a small reset button, its exact location and color can vary by model and year. Some units place the button behind the lower front panel, while others locate it inside the burner compartment or near the control board. In newer models, the reset switch may require removing a service door or panel to access the button. Always consult the owner’s manual for your specific model to locate the reset switch accurately before attempting a reset.

Below is a general reference to common layouts. This table uses typical patterns, but it is not a substitute for model-specific instructions.

Troubleshooting Flowchart For Atwood Furnace Reset

If the furnace trips repeatedly, follow this practical sequence to determine whether a reset is appropriate or professional service is required.

1. If you smell gas, evacuate and call emergency services; do not reset.
2. Confirm CO detectors are functioning; verify adequate ventilation.
3. Attempt a reset only after confirming there are no obvious vent blockages.
4. If ignition occurs but ceases shortly thereafter, inspect flame sensor and burner cleanliness.
5. If the problem persists after a reset, document any error codes or blinking LEDs and contact a qualified RV technician.

When To Call A Professional

Call a professional if there is a persistent inability to ignite after resets, recurring trips, or any sign of gas leaks or CO detection. Do not rely on repeated resets as a fix for underlying issues. An expert can diagnose gas pressure problems, electrical faults, venting obstructions, or defective safety switches, ensuring safe and reliable operation of the Atwood furnace.