Quick answer
Check the gas supply is on and the igniter is working. If the igniter glows but doesn't light, replace it. Ensure the thermostat is functioning and the gas valve is open.
Confirm the symptom
- Dryer runs but doesn't heat
- Clothes remain damp after cycle
- No gas smell when dryer is on
- Igniter doesn't glow or glows but doesn't ignite
Tools and prep
- Screwdrivers (flathead and Phillips)
- Multimeter for testing continuity
- Owner's manual for dryer model
- Flashlight for inspecting components
- Safety gloves and goggles
- Gas supply valve access
Step-by-step troubleshooting
- Check Gas SupplyDo: Verify the gas valve is fully open and the supply line is connected securely.Observe: Gas valve is open and line is intact.Means: Gas supply is not the issue.Next: Check Igniter
- Check IgniterDo: Inspect the igniter for cracks or damage. Use a multimeter to test for continuity.Observe: Igniter glows but doesn't light, or shows no continuity.Means: Igniter is faulty and needs replacement.Next: Replace Igniter
- Test ThermostatDo: Use a multimeter to check the thermostat for continuity when heated.Observe: Thermostat shows no continuity when warm.Means: Thermostat is defective.Next: Replace Thermostat
- Inspect Gas ValveDo: Check the gas valve for blockages or corrosion. Clean if necessary.Observe: Valve is clogged or corroded.Means: Gas valve needs cleaning or replacement.Next: Replace Gas Valve
- Check Safety SwitchesDo: Ensure the door switch and thermal cutoff switch are functioning properly.Observe: Switches do not close or show no continuity.Means: Safety switches are faulty.Next: Replace Safety Switches
- Examine Gas LineDo: Inspect the gas line for kinks, leaks, or disconnections.Observe: Line is damaged or leaking.Means: Gas line needs repair or replacement.Next: Call Professional
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Faulty Igniter The igniter may be cracked or burned out, preventing gas from igniting. | Common | Easy–Medium | Igniter |
| Closed Gas Valve The gas supply valve may be turned off, blocking gas flow. | Common | Easy | None |
| Defective Thermostat A faulty thermostat may not allow the gas valve to open. | Sometimes | Medium | Thermostat |
| Clogged Gas Valve Debris or corrosion can block the gas valve, preventing gas flow. | Sometimes | Medium | Gas Valve |
| Malfunctioning Safety Switch A faulty door or thermal cutoff switch can prevent the dryer from heating. | Sometimes | Medium | Safety Switch |
| Gas Line Leak or Damage A damaged or leaking gas line can stop gas from reaching the burner. | Rare | Hard | Gas Line Repair |
Parts matching
Common parts needed to fix a gas dryer that won't heat:
- Igniter (part #123456)
- Thermostat (part #789012)
- Gas Valve (part #345678)
- Safety Switch (part #901234)
Check your dryer's model number for accurate part numbers.
When to call a professional
- Gas smell is detected during inspection
- Gas line is damaged or leaking
- You're unsure about gas connections or safety
- Multiple components are faulty and need professional diagnosis
- Dryer has a complex gas system requiring specialized tools
FAQ
Why is my gas dryer running but not heating?
Possible causes include a faulty igniter, closed gas valve, or defective thermostat. Check these components first.
Can I replace the igniter myself?
Yes, if you have basic tools and follow safety precautions. Turn off gas and power before starting.
How do I know if the thermostat is bad?
Use a multimeter to test for continuity when heated. No continuity means the thermostat needs replacement.
Why would the gas valve be clogged?
Over time, debris or corrosion can accumulate in the gas valve, blocking gas flow.
Is it safe to use a gas dryer if it won't heat?
No, using a gas dryer that won't heat can be dangerous due to potential gas leaks. Stop use immediately and investigate the issue.