Gas Furnace

RV Gas Furnace Not Working

Why Won’t My RV Gas Furnace Ignite?

Potential Ignition System Failures

  • Faulty Igniter: A common issue is a malfunctioning igniter. If the igniter is not producing a spark, the furnace will not ignite. Check for any signs of wear or corrosion on the igniter and ensure it is properly positioned near the burner.
  • Measurement: Ensure the igniter has about a 1/8 inch gap between the metal pieces for proper spark generation.
  • Improper Gas Flow: Issues with gas flow can prevent ignition. This could be due to air in the lines, a faulty gas valve, or low propane pressure. Running other gas appliances like the stove can help clear air from the lines.
  • Check: Verify that the propane tank is turned on and that there are no kinks in the propane lines. If the stove burners produce weak or yellow flames, it may indicate low gas pressure or a faulty regulator.
  • Electrical Issues: The furnace requires electrical power to operate. A blown fuse or tripped breaker can prevent the furnace from igniting. Ensure the battery is charged and the electrical connections are clean and free of corrosion.
  • Testing: Check the fuse box or circuit breaker panel to see if any fuses are blown or breakers are tripped. Also, listen for the igniter clicking sound to determine if the electrical system is functioning.

Common Causes of an RV Gas Furnace Not Turning On

RV Gas Furnace Not Working

Thermostat Malfunctions

  • Thermostat Settings: Ensure the thermostat is set to heat mode and the temperature is high enough to trigger the furnace. Sometimes, the thermostat can be stiff or gummed up with dust, preventing proper operation.
  • Troubleshooting: Check the thermostat’s anticipator adjustment and ensure it is not melted into the housing. Clean the contacts if necessary.
  • Thermostat Switches: The thermostat often has multiple switches, including one for temperature control and another for the gas system. Ensure both switches are functioning correctly.

Blown Fuses or Tripped Breakers

  • Power Issues: The furnace needs 12 volts to operate. A blown fuse or tripped breaker can prevent it from turning on.
  • Testing: Check the fuse box or circuit breaker panel. Replace any blown fuses or reset tripped breakers.

Issues with the Gas Supply

  • Propane Availability: Ensure the propane tank is turned on and has sufficient gas. Low propane pressure can prevent the furnace from igniting.
  • Check: Turn on all stove burners to check for strong blue flames. If the flames are weak or yellow, it may indicate low gas pressure or a faulty regulator.
  • Gas Valve Issues: A sticking gas valve can prevent gas flow. Tapping the valve with a screwdriver and hammer may resolve this issue temporarily.

Why is My RV Gas Furnace Blowing Cold Air?

Incorrect Thermostat Settings

  • Thermostat Mode: Ensure the thermostat is set to heat mode and not cooling mode. Also, check that the temperature setting is high enough to activate the furnace.

Blocked Ducts

  • Airflow Obstructions: Check the return air vents and registers for any obstructions that could prevent proper airflow. Clear any debris or blockages.
  • Testing: Remove the exterior cover of the furnace and clean the inside of any debris, leaves, or insects that could affect airflow.

Issues with the Furnace’s Heat Exchanger

  • Heat Exchanger Problems: Soot around the furnace can indicate a more serious issue like a malfunctioning heat exchanger or motor. This typically requires professional inspection and repair.
  • Costs and Schedules: Regular inspections are recommended by manufacturers. If soot is present, it is advisable to take the furnace to a professional for diagnosis and repair.

Tools and Devices Required for Testing

  • Multimeter: For checking electrical connections and voltage.
  • Compressed Air: For cleaning out debris from the furnace and ducts.
  • Screwdriver and Hammer: For tapping a sticking gas valve.
  • Propane Pressure Gauge: For checking gas pressure if available.

Reference Links

  1. Dometic Furnace “Ignition Lockout Fault” – This source discusses specific issues with Dometic furnaces, including ignition lockout faults and potential solutions like clearing air from the gas lines.
  2. Atwood Furnace Won’t Ignite – This forum thread provides troubleshooting steps for Atwood furnaces, including checking battery power, gas supply, and igniter function.
  3. The Best Guide to Turning Up the Heat When Your RV Furnace Won’t Ignite – This guide offers comprehensive troubleshooting steps for various issues, including ignition problems, thermostat malfunctions, and gas supply issues.

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