Step-by-step fix
Step 1: Make sure the flame sensor is a reasonable fix
- Confirm you have a gas dryer, not an electric dryer.
- Think through the symptom: a failed flame sensor is most likely when the dryer runs but does not heat, or the igniter glows and the burner still does not light.
- Open the lower front access area or burner inspection area if your dryer has one and watch a short heat cycle.
- If the igniter never glows at all, the flame sensor may not be the only possible cause.
- If the igniter glows but the burner does not ignite, the flame sensor is a reasonable part to replace.
If it works: The symptom points to the burner ignition circuit, and replacing the flame sensor makes sense as a next repair.
If it doesn’t: If the dryer has no power, will not start, or is an electric model, stop and diagnose that issue first.
Stop if:- You smell gas before starting the repair.
- You see burned wiring, melted connectors, or heavy heat damage around the burner area.
- The symptom clearly points somewhere else, such as a broken belt, no power, or an electric heating problem.
Step 2: Shut the dryer down and get safe access
- Unplug the dryer from the outlet.
- Turn off the gas supply valve to the dryer.
- Pull the dryer forward enough to work comfortably if needed.
- Remove the front lower panel, front panel, or other service panel needed to reach the burner assembly.
- Set screws aside in a cup or tray so they do not get lost.
If it works: The dryer is disconnected from power and gas, and you can see or reach the burner housing.
If it doesn’t: If access is too tight, move the dryer farther out and improve your lighting before continuing.
Stop if:- The gas shutoff valve will not fully close.
- You damage the gas connector or notice the gas line is loose or corroded.
- A panel will not come off without forcing hidden clips or fasteners you cannot identify.
Step 3: Locate and remove the old flame sensor
- Find the flame sensor mounted on the outside of the burner tube or burner housing near the igniter end.
- Take a quick photo of the sensor position and wire routing before removing anything.
- Disconnect the wire connector from the sensor by pulling on the connector, not the wire.
- Remove the mounting screw or screws holding the sensor in place.
- Lift the old sensor out and compare it to the new one before installing.
If it works: The old sensor is out, and the new sensor matches the mounting style, connector, and sensing tip layout.
If it doesn’t: If the new part does not match, pause and verify fit before installing anything.
Stop if:- The wire connector is burned, loose, or crumbling.
- The burner housing is cracked, badly rusted through, or damaged where the sensor mounts.
Step 4: Install the new flame sensor
- Place the new flame sensor in the same position and orientation as the old one.
- Reinstall the mounting screw or screws and tighten them snugly without overtightening.
- Reconnect the wire connector fully so it seats firmly.
- Route the wire the same way it was originally so it stays clear of hot or moving parts.
- Double-check that the sensor is secure and not touching the igniter or burner parts it should not contact.
If it works: The new sensor is mounted securely, connected properly, and positioned like the original.
If it doesn’t: If the connector feels loose, inspect the terminal fit and correct it before reassembling the dryer.
Stop if:- The new sensor will not sit flat or line up with the mounting hole.
- The connector will not attach securely because the terminal is damaged.
Step 5: Reassemble the dryer and restore service
- Reinstall any burner cover, front panel, or access panel you removed.
- Make sure no tools, screws, or loose wires are left inside the cabinet.
- Turn the gas supply valve back on.
- Plug the dryer back in.
- Push the dryer back into place carefully without crushing the vent or gas line.
If it works: The dryer is fully reassembled and ready for a live heat test.
If it doesn’t: If a panel does not fit back correctly, remove it and check for a trapped wire or misaligned tab.
Stop if:- You smell gas after turning the supply back on.
- The vent, gas connector, or power cord is pinched or damaged during reassembly.
Step 6: Test for ignition and steady heat
- Run the dryer on a heat cycle and listen near the burner area.
- Watch through the inspection opening if your dryer allows safe viewing with the panel in place.
- Look for a normal sequence: the igniter glows, the burner lights, and the dryer begins producing heat.
- Let the dryer run for several minutes to make sure the flame cycles normally and the heat holds.
- Check that the dryer tumbles, heats, and shuts off normally without unusual smells or noises.
If it works: The burner ignites normally and the dryer produces steady heat in real use.
If it doesn’t: If the igniter still glows without flame, or there is still no heat, continue diagnosing the gas valve coils, igniter circuit, thermal devices, or wiring.
Stop if:- You smell gas at any point during testing.
- The burner area flashes, pops, or behaves erratically.
- The dryer overheats, trips power, or shows signs of electrical arcing.
Replacement Parts
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FAQ
What does a dryer flame sensor do?
It helps the dryer confirm heat and flame conditions at the burner. If it fails, the burner may not ignite properly even though other parts of the ignition system are trying to work.
How do I know if the flame sensor is bad instead of the igniter?
A common clue is that the igniter glows but the gas burner does not light. If the igniter never glows, the problem may be elsewhere, including the igniter itself, a thermal device, wiring, or another part of the ignition circuit.
Can I replace a dryer flame sensor myself?
Yes, many homeowners can handle it if they are comfortable removing access panels and working carefully around a gas appliance. The key is to unplug the dryer, shut off the gas, and avoid forcing parts or connectors.
Do I need to replace the igniter at the same time?
Not necessarily. Replace the igniter only if testing or symptoms point to it. If the igniter is working and the flame sensor is the failed part, replacing just the sensor is usually enough.
Why is my dryer still not heating after replacing the flame sensor?
The next likely causes can include weak gas valve coils, a failed igniter, an open thermal fuse or thermostat, wiring trouble, or poor airflow causing other heat-related problems. The flame sensor is only one part of the heating system.