Dryer Runs But Won't Heat: What's Actually Wrong
Fleming Appliance Repair
A dryer that tumbles but doesn't heat is the single most common call we get. The good news is that the drum turning tells us something useful right away: the motor is fine and the belt is intact. The problem is on the heat side, which is a shorter list.
Before anything else, there's one check that costs nothing and solves a surprising number of these.
Check These First
All of these are free. Work through them before you call anyone — including us.
1.Check both halves of the breaker
An electric dryer runs on a double breaker — 240 volts. If only half of it trips, the dryer still gets 120 volts, which is enough to turn the drum and light the panel but not enough to heat. It looks like a broken dryer and it's a free fix. Flip the breaker fully off, then back on. If it trips again, stop and call someone.
2.Pull the vent off the back
Run the dryer for a minute with the vent disconnected. If it heats fine with the vent off and not with it on, your problem isn't the dryer at all — it's a blocked vent line. This matters more than most people realize, and it's the reason parts fail in the first place.
3.Clean the lint screen, then look past it
Everyone cleans the screen. Almost nobody cleans the housing the screen slides into. Pull the screen and shine a light down the slot — if it's packed, that's restricting airflow every single cycle.
4.Gas dryers: confirm the gas is actually on
Sounds obvious, but if anyone has worked on the gas line recently, the shutoff behind the dryer can get left closed. The dryer will run a full cycle without heating and never complain.
What’s Actually Failing
Roughly in order of how often we find each one.
Thermal fuse
A one-time safety fuse that blows when the dryer overheats. It's the most common failed part on a no-heat dryer, and here's the part that matters: it blew for a reason. A restricted vent makes the dryer run hot, the fuse does its job, and if the vent doesn't get cleared the new fuse blows too. Replacing the fuse without clearing the vent is a repair that fails twice.
One of the least expensive parts in the machine.
Heating element (electric)
A coil that glows to make heat. When it breaks, you get airflow and tumbling with no warmth at all. Elements usually fail from running hot over time — which, again, traces back to airflow.
Mid-range. The part is more than a fuse, well short of a new dryer.
Igniter or gas valve coils (gas)
On a gas dryer the igniter glows, then the valve coils open to release gas. A weak igniter will still glow orange but never get hot enough to trigger ignition, which fools a lot of people into thinking it's working. If you watch it glow and then just fade out with no flame, that's the tell.
Mid-range, and usually a same-visit repair.
Cycling thermostat or thermistor
These tell the dryer how hot it currently is. When one drifts out of range, the dryer either won't call for heat or shuts heat off far too early. Symptoms overlap heavily with a bad element, which is why guessing at parts gets expensive.
Comparable to a thermal fuse.
Control board or timer
Least common on this list, and worth ruling the cheaper parts out first. A board is the one repair where it's genuinely worth asking whether the dryer is old enough that replacement makes more sense.
The expensive one. We'll tell you honestly if it isn't worth it.
When to Stop and Call
- The breaker trips again right after you reset it — that's an electrical fault, not a dryer annoyance
- You smell gas at any point, in which case shut the gas off and ventilate before anything else
- It heats with the vent disconnected but not connected, and the vent run is inside a wall or up through the roof
- You've replaced a thermal fuse and it blew again
Need someone to look at it?
We service dryer repairs across Collin & Denton County. $75 service call, waived when you have us do the repair.
Common Questions
- Why does my dryer tumble but not heat?
- The drum turning proves the motor and belt are fine, so the fault is on the heating circuit. On an electric dryer the most common causes are a half-tripped double breaker, a blown thermal fuse, or a failed heating element. On gas it's usually the igniter or the valve coils. A blocked vent sits behind a lot of these.
- Can a clogged vent stop a dryer from heating?
- Yes, and it's the cause people miss most. Restricted airflow makes the dryer overheat, which trips the thermal fuse and shuts down heat entirely. Clearing the vent is part of doing the repair properly — otherwise the same part fails again in a few months.
- Is a dryer that won't heat worth repairing?
- Usually yes. Most no-heat causes are inexpensive parts, and the labor is straightforward. The exception is a failed control board on an older machine, where the repair can approach the cost of a replacement. We give you the number before we start so you can decide.
- How much does it cost to find out?
- Our service call is $75, and it's waived when you have us do the repair. That covers coming out, diagnosing it properly, and giving you an exact price before any work happens.
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