Problem: RV Furnace Clicks But Won’t Ignite

“Why is my RV furnace clicking but not lighting”

If your RV furnace is clicking but won’t ignite, that means the system is trying to start—but failing during ignition.

This is actually a good sign. It means:

  • You have power
  • The thermostat is working
  • The control board is initiating the sequence

Now the issue is almost always spark, gas flow, or flame detection.

Possible Causes

Faulty Igniter Electrode (Most Common)

The igniter creates the spark that lights the burner.

  • Cracked ceramic housing
  • Corroded or dirty tip
  • Incorrect gap or alignment

Result: You hear clicking, but no flame.

No Propane or Weak Gas Flow

Even with a spark, the furnace won’t ignite without fuel.

  • Empty propane tank
  • Closed or partially closed valve
  • Bad regulator
  • Air in propane lines

Result: Clicking continues, but no ignition.

Dirty or Blocked Burner Tube

Fuel may not be reaching the ignition point properly.

  • Dirt, rust, or debris buildup
  • Spider webs or insect nests (very common)

Result: Gas flow is restricted or uneven.

Bad Gas Valve

The gas valve must open to allow propane into the burner.

  • Stuck or failed valve
  • No gas reaching burner

Result: Spark is present, but no fuel to ignite.

Faulty Control Board

The control board manages ignition timing and gas flow.

  • May not send proper voltage to igniter
  • May fail to open gas valve correctly

Result: Clicking without ignition or inconsistent attempts.

How to Fix It (Step-by-Step)

Step 1: Confirm Propane Supply

  • Make sure tank is not empty
  • Ensure valve is fully open
  • Test stove or another propane appliance

If nothing else works, it’s a propane issue.

Step 2: Listen to the Ignition Sequence

Turn thermostat up and listen:

  • Repeated clicking = igniter working
  • No flame = ignition or gas issue

This confirms you’re in the right troubleshooting path.

Step 3: Inspect the Igniter Electrode

  • Check for cracks or corrosion
  • Clean the tip if dirty
  • Ensure proper positioning near burner

If damaged or worn, replace it.

Step 4: Check the Burner Tube

  • Remove debris, rust, or buildup
  • Look for insect nests blocking flow

A blocked burner is more common than most people realize.

Step 5: Evaluate Gas Valve and Control Board

If:

  • Spark is strong
  • Propane is confirmed
  • Burner is clean

Then the issue is likely:

  • Gas valve not opening
  • Control board not sending correct signal

Pro Tip

If your furnace is clicking but won’t ignite:

Start with the igniter first—it’s the most common and easiest fix.
If that checks out, move to propane supply and then the gas valve.