Fix a Dryer That Runs But Won't Heat
A dryer that tumbles happily but never gets hot has usually killed one cheap part: a thermal fuse that blew because the vent is clogged, or a heating element coil that snapped. Work the free checks first, then test parts in order.
What is actually broken
On an electric dryer, heat comes from a coiled element that glows like a toaster. Three things kill it most often. The 240-volt breaker can half-trip — the motor runs on one leg, the element gets nothing. Lint chokes the vent run, the dryer overheats, and the one-time thermal fuse blows to prevent a fire (that fuse is doing its job — find out why it blew). Or the element coil itself fatigues and breaks after years of heat cycles. Each has a different test, and this guide runs them cheapest-first. Gas dryers differ: a failed igniter or gas valve coil is the usual story, and gas work has its own stop point below.
Safety first
- Unplug the dryer before the back panel comes off — and on an electric dryer that plug carries 240 volts. No testing with the panel off and the cord in.
- Never bypass a thermal fuse, not even 'just to test.' It is a fire-prevention part; a bypassed fuse is how dryer fires start. Replace it, and fix the vent problem that blew it.
- Gas dryer? If you smell gas at any point, stop, leave, and call the gas company or a pro. This guide's part swaps are for electric models.
The fix, step by step
1 Reset the breaker properly
Electric dryers run on a double (240V) breaker, and one side can trip while the other holds — motor spins, no heat. Push the breaker firmly to OFF, then back to ON. Then run the dryer on a timed high-heat cycle for two minutes and feel the drum air. Heat restored? You are done, and it cost nothing.
Tip: A breaker that half-trips repeatedly is telling you something — if it happens again within a few loads, get an electrician to look at the breaker and the outlet.
2 Clear the vent run, end to end
Pull the lint screen and wash it if fabric-softener film has glazed it (water should pour through it). Disconnect the exhaust hose behind the dryer and vacuum it out, then check the outside flap — it should blow wide open on a dry cycle and not be painted shut or nested in. A crushed hose behind a pushed-back dryer is a classic.
Tip: If the thermal fuse blew, this step is not optional: a new fuse on a still-clogged vent blows again within a few loads.
3 Test the thermal fuse with a multimeter
Unplug the dryer, pull it out, and remove the back panel (usually 1/4-inch hex screws). The thermal fuse is a small white or black part on the blower housing or element can, with two wires. Pull one wire off and touch the meter probes to its terminals on the continuity setting. Beep or near-zero ohms = good. Silence or OL = blown, replace it.
Tip: Take a photo of every wire before you pull it. Dryer backs are a spaghetti of same-colored wires, and the photo is your reassembly map.
4 Inspect and test the heating element
The element lives in a metal canister or as an open coil behind the drum. Look first: a coil with a visible break, sag, or a section touching the can is done. To be sure, pull one wire and test continuity across its terminals the same way — no continuity means open coil, replace the element (sold as a coil kit or a complete canister; the canister is the easier swap).
Tip: Match parts by the dryer's model number, not by looks. Element wattages differ, and the wrong one either under-heats or cooks fuses.
5 Reassemble, then prove it outside
Refit the panel, reconnect the vent, plug in, and run a towel load on high heat. After five minutes the drum should be properly hot; then go outside and confirm strong warm air at the vent flap. Weak outside airflow with good heat means the vent still has a restriction — the fuse will blow again if you ignore it.
Tip: Write the date and the part you replaced on a strip of tape inside the lint-screen slot. Future-you will thank present-you.
Stop and call a pro if…
Call an appliance tech if there is no continuity problem anywhere (control board or timer faults are diagnosis-heavy), if wiring anywhere is scorched or melted, or if it is a gas dryer with an igniter that glows but no flame — gas valve work is licensed work in most places.
Your work, your responsibility
If you do this repair yourself: you attempt it entirely at your own risk. This guide is general information, not professional advice, and it can be wrong or incomplete. ClickTheFix is not responsible for injury to you or anyone else, or for damage to your property, that results from following — or misfollowing — this guide. Follow the safety warnings, use proper protective gear, follow the manufacturer's instructions and your local codes, and stop if any step is beyond your skill or comfort.
If a contractor does the work: any contractor you hire is an independent professional working under an agreement between you and them alone. ClickTheFix does not provide repair services, does not supervise or control their work, and does not guarantee or warranty it. ClickTheFix is not liable for a contractor's errors, omissions, poor workmanship, property damage, or injuries.