How to Fix a Dryer That's Not Heating

Difficulty: Medium • Time: 30 min active, 60 min total • Estimated cost: $0-50 • Safety: Advanced repair

Overview

A dryer that tumbles but doesn't heat is one of the most common appliance complaints — and one of the most fixable. The drum spins, the timer advances, the clothes come out damp and cold. In about 80% of cases the fix costs under $30 and takes less than an hour, once you know which part failed.

The most important thing to check first: is your dryer gas or electric? The answer changes the diagnostic path completely. Electric dryers heat with a coiled metal element (like a giant toaster). Gas dryers heat with a burner assembly fed by an igniter and gas valve solenoids. Both share one critical safety part — the thermal fuse — and that fuse is the single most common reason either type stops heating.

Here's the key insight most guides bury: a blown thermal fuse is a symptom, not a root cause. The fuse blows because something caused the dryer to overheat — almost always a clogged vent. If you replace the fuse without cleaning the vent, you'll blow the new fuse within weeks. We'll walk through the real diagnostic order: check the vent first, then the fuse, then the heating components.

Tools Needed

Phillips and flathead screwdrivers
Multimeter (essential for this repair)
Nut driver set (1/4" and 5/16")
Vacuum with hose attachment
Flashlight

Materials Needed

Dryer thermal fuse (universal) — $5-12
Dryer vent cleaning kit (12ft brush + vacuum adapter) — $15-25
Dryer heating element (universal electric) — $20-45
Gas dryer igniter (universal) — $15-30

Step-by-Step Instructions

Check the vent first — this is the real root cause in 30-40% of cases: Pull the dryer away from the wall. Disconnect the vent hose from the back of the dryer and from the wall duct. Look inside both — if you see packed lint, that's likely your entire problem. A clogged vent traps hot air, the dryer overheats, and the thermal fuse blows to prevent a fire. Even if the fuse hasn't blown yet, a restricted vent makes the dryer heat poorly because exhaust can't escape. Clean the vent hose completely. Then run a vent brush kit through the wall duct all the way to the outside flap. Go outside and check that the exterior vent flap opens freely and isn't blocked by lint, a bird nest, or a screen that's clogged (some builders install screens that become lint traps within a year — remove them). If the vent run is longer than 25 feet or has more than two 90-degree bends, airflow is inherently restricted and you should consider a booster fan or a shorter route. A dryer with a clean, short vent heats faster, dries faster, and lasts years longer.
Determine if your dryer is gas or electric — the fix path diverges here: Look behind the dryer. If there's a standard 3- or 4-prong plug going to a large 240V outlet (looks like a range outlet, not a regular plug), it's electric. If there's a flexible metal gas line plus a regular 120V plug, it's gas. You can also check the model number label inside the door frame — it will say 'gas' or 'electric' and list the model number you'll need for parts. Write down the model number now; you'll need it for parts lookup. For electric dryers, the heating element is the most common failure after the thermal fuse. For gas dryers, the gas valve solenoids and igniter are the most common failures. The thermal fuse fails on both types at roughly equal rates.
Test the thermal fuse with a multimeter — the #1 part that fails on both gas and electric: The thermal fuse is a small, flat device mounted on the exhaust duct housing or the blower housing inside the dryer. On most models, you access it by removing the back panel (electric) or the lower front panel (some gas models). Unplug the dryer. Remove the two wires from the fuse terminals. Set your multimeter to continuity (the beep setting) or the lowest ohms range. Touch one probe to each terminal. A good fuse reads near zero ohms and beeps on continuity. An open fuse reads OL (infinite resistance) and gives no beep — it's blown and needs replacement. The fuse itself is $5-12 and snaps in with two screws. But remember: a blown thermal fuse means the dryer overheated. If you didn't find and fix a vent clog in step 1, look harder — there's a reason it blew. Replacing the fuse without fixing the cause is buying yourself 2-6 weeks before it blows again.
Electric dryers: test the heating element: If the thermal fuse tested good, test the heating element next. On most electric dryers, the element is a coil of resistance wire inside a metal housing, accessed by removing the back panel. Unplug the dryer. Disconnect one wire from the element terminals. Set your multimeter to ohms. Touch one probe to each terminal. A good element reads between 10 and 50 ohms (varies by model). An open element reads OL — it's broken and needs replacement. Also visually inspect the coil through the housing — look for a visible break or a spot where the coil is touching the housing (this causes a ground fault and partial heating). A universal replacement element runs $20-45. When installing the new one, make sure the coil doesn't contact the housing at any point — a single contact point will ground it out and either trip the breaker or cause uneven heating. Also check the high-limit thermostat (mounted near the element) the same way you tested the thermal fuse — continuity means good, OL means replace ($5-15).
Gas dryers: check the igniter, flame sensor, and gas valve solenoids: Gas dryers have a more complex heat system: a glow-bar igniter heats up, a flame sensor detects the heat and opens the gas valve, gas flows, the igniter lights it. Any part in that chain can fail. Start with the igniter — it's the most common gas dryer failure. Access the burner assembly (usually behind the lower front panel). Run a test cycle. Watch the igniter through the opening — it should glow bright orange within 60 seconds. If it glows and then gas ignites, the igniter is fine. If it glows but gas never flows, the gas valve solenoids are likely bad (they weaken over time and can't open against gas pressure even though the igniter is hot enough — this is the sneakiest gas dryer failure because it's intermittent at first). If the igniter doesn't glow at all, it's open — test with a multimeter (good igniters read 50-400 ohms; OL means replace). Igniters are $15-30 and are fragile ceramic — handle the new one by the metal mounting bracket only, never touch the ceramic bar with your fingers.
Check the cycling thermostat and timer contacts: If everything above tested good, two less common causes remain. The cycling thermostat (mounted on the blower housing, looks similar to the thermal fuse) regulates temperature during the cycle — if it's stuck open, the heater never turns on. Test it for continuity at room temperature; it should read near zero ohms (closed). If it reads OL at room temperature, it's stuck open — replace it ($10-20). The other possibility is a failed timer: the timer has internal contacts that route power to the heating circuit during the timed dry cycle. If those contacts are burned or pitted, the motor runs but no power reaches the heater. You can test this by running the dryer on different cycle settings — if it heats on one setting but not another, the timer contacts for that cycle are bad. Timer replacement runs $30-70 and is usually a pull-two-knobs, remove-four-screws, swap-the-part job.
Reassemble, test, and set up a maintenance routine: Reconnect all wires to their original terminals (take a photo before you disconnect anything if you haven't already). Reattach all panels. Reconnect the vent hose — use a proper 4-inch metal clamp, not duct tape (tape deteriorates from heat and creates lint-catching ridges). Push the dryer back into position but leave enough space behind it so the vent hose isn't kinked or crushed — a crushed hose restricts airflow just like a clogged one. Plug in the dryer (or turn the gas back on). Run a full cycle with a damp towel inside. Verify: the drum gets hot within 5 minutes, the towel is dry at the end of the cycle, and you can feel warm air coming out the exterior vent flap. Going forward: clean the lint trap before every load (not after — before, so you never forget), clean the full vent duct every 12 months (mark your calendar), and never run the dryer with a disconnected or kinked vent. These three habits prevent 90% of no-heat callbacks and dramatically reduce fire risk.

When to Call a Professional

Call an appliance technician if: you smell gas and can't identify the source (call the gas company emergency line first, then a technician); the dryer trips the circuit breaker repeatedly (could be a shorted element touching the housing, or a wiring problem in the house — not safe to keep resetting); you've replaced the thermal fuse twice and it keeps blowing even with a clean vent (the cycling thermostat or high-limit thermostat may be failing intermittently, which requires watching it with a multimeter through a full cycle); the control board shows error codes you can't clear (newer electronic dryers); or you're not comfortable using a multimeter on 240V wiring. Average service call: $80-150 diagnostic fee, $150-300 for most repairs (fuse, element, igniter, solenoids). If the repair quote exceeds $350 on a dryer older than 10-12 years, replace it — a new dryer is $400-700 and you'll get modern efficiency and sensor drying.