If your gas dryer runs but makes no heat, you are almost certainly looking at one of three parts: the igniter, the thermal fuse, or the gas valve coils. These fail more than anything else on a gas machine, whether it is a Whirlpool, Maytag, Samsung, LG, or GE, and each has a distinct signature.
Why gas dryers fail differently than electric
An electric dryer heats with a resistive element. A gas dryer burns a flame, which means a burner assembly with moving parts: a glow-bar igniter, a radiant flame sensor, solenoid coils on the gas valve, and a thermal fuse in the circuit. More parts, more to fail, and the failures tend to be all-or-nothing rather than gradual. Both machine types share the same thermostats and cycling parts, but the ones below are gas-specific.
The igniter
The igniter is a glow-bar, silicon carbide or silicon nitride. On a call for heat, it glows orange-hot, which lights the gas and heats the flame sensor beside it. Igniters fail often. They are fragile, they cycle thousands of times, and they crack. A cracked one either never glows (no heat at all) or glows but cannot carry enough current to trip the sensor (intermittent or no heat).
Reaching it means pulling apart a good chunk of the cabinet to get at the burner. The part is cheap; the labor is where it adds up. It is also easy to misread: a glow-but-no-flame pattern usually means the coils, not the igniter, so swapping the igniter first is a costly guess.
The thermal fuse
The thermal fuse is a one-shot safety on the exhaust duct or blower housing. Overheat once and it blows, cutting power to the heat circuit for good. The drum keeps spinning, zero heat. A blown fuse almost always means the dryer overheated, which almost always means a restricted vent. Replace the fuse without clearing the vent and the new one blows within weeks.
The one check you can safely do first: inspect the vent run from the back of the machine all the way to the exterior cap. Look for crushed flex hose, tight bends, or a damper stuck shut. It is free to confirm and it heads off the most common repeat failure. Clear vent means the problem is inside the machine.
Flame sensor and gas valve coils
Here is where diagnoses go wrong. The radiant flame sensor sits next to the igniter, a normally closed bimetallic switch. When the igniter heats it enough, it opens and lets the valve coils stay energized. Heat from the flame keeps it open while the burner runs; when the flame dies between cycles, it cools, closes, and shuts the valve.
The gas valve usually has two or three solenoid coils. If any one fails, the valve cannot open and no gas reaches the burner. The signature is specific: the igniter glows orange, sometimes visible through the lint filter opening, but the gas never lights and the igniter cools without a flame. That glow-but-no-ignition pattern is almost always the coils. The sensor itself can also fail and looks identical from outside.
Getting this right means running the machine and watching the sequence. That is how you tell igniter from coil from sensor. Guessing and ordering parts is how a $150 repair becomes $300.
What a tech runs through
- Listen to the cycle. Does the igniter glow? Does the valve click?
- Check the thermal fuse for continuity first. If it is blown, inspect the vent before replacing it.
- Fuse fine and igniter glows but no flame? Test the valve coils.
- No glow at all? Test the igniter and the high-limit thermostat in the same circuit.
Fuses and igniters are the most common by a wide margin. Coil failures are less frequent but not rare, especially on machines 8 to 12 years old.
The one check worth doing yourself
Inspect the exhaust vent before anything else. It is the only genuinely free, no-disassembly check. Clear vent, stop there and call rather than pulling the machine apart. Do not keep running loads while you troubleshoot; a restricted vent stresses the motor and blower, and if the coils are the issue you are cycling the igniter for nothing. If you smell gas at any point, shut the supply valve behind the machine, ventilate, and call.
Schedule a visit
Replacing the fuse, igniter, or coils all mean getting into the burner assembly. Even the “simple” fuse swap involves disassembly, and misreading which part failed (igniter versus coils is the classic mix-up) turns a one-part repair into two. Gas is involved, and getting it wrong costs more to undo than the original repair.
Bay Area Appliance Repair Service covers the whole Bay Area and carries common dryer parts on the truck, so it is usually one visit. Our $75 diagnostic is credited to the repair, with a written repair-or-replace call and price after the visit. Call (925) 999-4095 or book on the contact page.