Gas Dryer Not Heating: What to Check

When a gas dryer tumbles but stays cold, the usual causes are a closed gas valve or empty propane tank, a cycle that never uses heat, a tripped breaker, or a failed ignition part such as the igniter, flame sensor or gas valve coils. The first few you can check in minutes without tools. Anything involving the burner or gas connections is a job for a qualified technician.

Start with the safety basics below, then work through the checks in order.

Safety first: if you smell gas

Natural gas is given a sharp, skunk-like odor so leaks are easy to notice, according to the federal Pipeline and Hazardous Materials Safety Administration (PHMSA). If you smell it near the dryer, don't try to troubleshoot. Leave the house on foot and get everyone else out. Don't flip light switches, unplug anything, use a phone near the smell, or do anything else that could make a spark. Once you're outside and away from the house, call your gas utility or 911.

Connecticut's utility regulator adds two rules worth following everywhere: never turn gas back on after it was shut off for safety, and leave gas line work to a licensed plumber or the gas company. NFPA also recommends having a professional inspect a gas dryer's line and connection for leaks and damage.

Confirm it really isn't heating

Maytag suggests a simple test. Choose a heated timed cycle, run the dryer empty for about five minutes, then open the door and feel inside. If the air is warm, the burner is working and the real issue is slow drying, which usually traces back to lint, venting or load size. Our guide to a dryer not heating covers that side, including electric models.

If the drum is cold after five minutes, unplug the dryer before you touch anything behind it and keep going.

What you can check safely yourself

1. The cycle and temperature setting

Air Only and Air Fluff cycles never add heat, Maytag notes, and GE says fluff and cool-down settings run without heat too. Pick a real drying cycle with a heat setting and test again.

2. The gas shutoff valve

Look at the shutoff valve on the gas line behind the dryer. Whirlpool and Maytag both say the valve is open when its handle runs parallel to the pipe. If the valve is closed, the drum still turns but the burner never lights. On a new installation, GE says to confirm the gas line has been turned on. If you're unsure about the valve or the connection, stop and call a pro rather than working on fittings yourself.

3. The propane tank (LP models)

Frigidaire points out that an LP dryer won't heat if the tank is empty, so check the tank gauge and refill or replace it if needed. If natural gas service to the home has been interrupted, Frigidaire says to contact the gas company.

4. The breaker and outlet

A gas dryer still runs on electricity. The drum motor, controls and igniter all need power. GE says gas models should be plugged into their own dedicated 120-volt outlet, and Maytag recommends checking for a tripped breaker or blown fuse. Whirlpool notes that gas dryers use one fuse or breaker, while electric dryers use two.

5. Airflow around the dryer

The burner needs air. GE says nothing should block the front of the dryer, and Frigidaire says to keep laundry and rugs away from the front and back of a gas model. Also clean the lint screen and check the duct behind the dryer for kinks. A blocked vent can cause overheating, which can trip the thermal fuse and stop the heat entirely. Our guide to a clogged dryer vent explains the warning signs.

6. Any error code on the display

Some dryers tell you directly. LG lists a gAS code that means a gas supply problem, and says to confirm the valve is open and the line isn't kinked. Check your owner's manual or the manufacturer's support pages before assuming a part has failed.

How gas ignition works

Knowing the sequence helps you describe the problem to a technician. GE explains that its gas dryers use a glow-bar igniter instead of a standing pilot light. About 15 seconds after the cycle starts, the igniter turns on and heats up. Once it's hot enough, a sensor signals the gas valve to open, and the igniter lights the gas. The igniter then shuts off and repeats the sequence whenever the dryer calls for more heat.

GE also notes that gas isn't released unless the igniter is working properly. That's why a weak igniter usually leaves the burner dark rather than sending out unburned gas. It's also normal to see a flickering orange glow under the right side of a running gas dryer, which GE says is the flame from the burner.

The parts that usually fail

If gas, power and settings all check out, a part has likely failed. Whirlpool and Maytag describe these components in their parts guides:

Maytag recommends a professional for flame sensor replacement. Whirlpool recommends a pro whenever the dryer has to be taken apart to fix a burner or thermal fuse problem. If the fuse has blown, our dryer thermal fuse guide explains why clearing the vent matters before replacing it.

What a technician tests

A gas appliance technician usually starts by watching the ignition sequence through the burner access. If the igniter never glows, they check it and the fuse or sensors that feed it power. If the igniter glows but the burner doesn't light, the gas valve coils or flame sensor are the usual suspects. If the flame lights and then goes out early, they look at sensors, thermostats and airflow. A careful tech also leak-checks the gas connection after any work and looks at the vent, since a part that failed from overheating will fail again if airflow stays poor.

Companies listed under gas dryer repair handle this kind of work. Brand pages for Whirlpool, Maytag and GE dryer repair list local companies that work on those machines.

When to stop DIY and call a pro

• You smell gas at any point. Leave and call the gas utility or 911 from outside.
• The valve, breaker, settings and lint screen are fine and it still won't heat.
• You'd have to remove panels, test parts with a meter or touch gas fittings.
• The thermal fuse has blown, especially more than once.
• You see scorch marks, melted plastic or smell burning.

Gas dryer exhaust also carries combustion gases, including carbon monoxide, outside. HUD treats a detached or blocked dryer exhaust as a serious hazard, and the Department of Energy's Building America program recommends a carbon monoxide alarm in the laundry area when you have a gas dryer.

What the repair usually costs

Fixr lists igniter replacement at about $100 to $250 and gas valve coil replacement at about $150 to $300. Angi puts a thermal fuse repair at about $80 to $130 and says gas dryer repairs typically run about $50 to $100 more than similar electric dryer repairs. Fixr puts most gas dryer repairs between roughly $100 and $450 overall. Our dryer repair cost guide has more ranges by part, and if your dryer is older, our guide on how long dryers last can help you weigh repair against replacement.

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