Quick answer: A dryer that tumbles but produces no heat has one of seven problems, in this order of likelihood: a half-tripped 240V breaker (electric), a restricted vent, a blown thermal fuse, a burned-out heating element (electric), a failed glow-bar igniter (gas), worn gas valve solenoids (gas), or a failed thermostat/thermistor. Steps 1 and 2 are free DIY checks that resolve a surprising share of "no heat" calls — start there before booking anything.
One pattern worth understanding up front: restricted venting is the root cause behind most no-heat failures, even when the part that actually failed is the thermal fuse or the element. When the vent clogs, heat can't escape, the temperature inside the cabinet climbs, and the safety devices do their job — permanently, in the case of the thermal fuse. Replacing the fuse without fixing the airflow just schedules the next failure a few weeks out.
Step 1: Check the Breaker (Electric Dryers)
What to check: Electric dryers run on a 240V circuit with a double (two-pole) breaker. If only one leg trips, the motor still gets 120V — so the drum tumbles normally — but the heating element gets nothing. In the panel, the breaker handle may look only slightly off-center rather than fully tripped. Flip the double breaker firmly OFF, then back ON.
What it indicates: A half-tripped breaker, a worn breaker that trips under the element's load, or (less often) a burned wire at the dryer's terminal block.
DIY fix: Resetting the breaker is safe. Call a tech (or an electrician) if: the breaker trips again — repeated tripping means the element is shorting to ground or the breaker itself is failing, and both need proper diagnosis, not repeated resets.
Step 2: Check for Vent Restriction
What to check: Three quick checks. First, the lint screen — clean it, and if it looks glazed (fabric-softener film), wash it with warm soapy water and a brush. Second, pull the dryer out, disconnect the duct from the back, and run a short drying cycle: strong warm airflow at the dryer outlet with the duct off means the machine is fine and the duct is the problem. Third, go outside while the dryer runs and check the vent flap — it should blow open with obvious airflow.
What it indicates: Lint buildup in the duct run, a crushed section of flexible duct behind the machine, or a stuck outside flap. Denver's dry climate makes lint especially fine and fast-accumulating.
DIY fix: Vacuum the duct as far as you can reach from both ends and replace crushed flexible sections (rigid or semi-rigid duct is best). This is homeowner-friendly work. If drying improves but heat still cuts out, continue to step 3 — the safety devices may already have taken damage.
Step 3: Check the Thermal Fuse
What to check: The thermal fuse is a one-time safety device wired in series with the heat circuit — once it blows, heat is gone until the fuse is replaced. It sits on the blower housing or exhaust duct inside the cabinet. With the dryer unplugged, the fuse should read closed (0 ohms) on a multimeter; an open reading confirms it blew.
What it indicates: Overheating — almost always caused by the vent restriction from step 2, not by the fuse itself.
DIY fix: Possible for confident owners (the part is $10–$25), but the panel disassembly varies a lot by brand, and the airflow problem must be resolved as well or the new fuse will blow again within weeks. Call a tech if: you'd rather have the fuse, the root cause, and the rest of the heat circuit verified in one visit — repair runs $150–$220.
Step 4: Check the Heating Element (Electric)
What to check: The heating element is a long coil of resistance wire inside a metal housing. Elements burn out with age — a break in the coil is often visible once the housing is out, or the element reads open on a multimeter (a healthy element reads roughly 8–15 ohms).
What it indicates: Normal wear (5–10 years of use), accelerated by restricted airflow. If the element shorted against its housing, it can also trip the breaker from step 1.
DIY fix: Not recommended unless you're comfortable with major disassembly — on many models the whole drum has to come out. Call a tech. This is the #1 electric-dryer repair; it runs $180–$280 and multiple element sizes for Whirlpool, Samsung, LG, and GE platforms are stocked on the truck, so it's usually a same-day fix.
Step 5: Check the Glow-Bar Igniter (Gas)
What to check: Remove the lower front panel (usually two clips or screws) and watch the burner tube while a heat cycle starts. Normal sequence: the igniter glows bright orange within 15–30 seconds, the gas valve clicks open, and a blue flame appears. If the igniter never glows, it has failed open. If it glows, the valve clicks, but no flame ignites — move to step 6.
What it indicates: Glow-bar igniters are wear parts that fail predictably after 5–8 years.
DIY fix: Not recommended — the igniter is brittle ceramic on a live gas appliance. Call a tech. Repair runs $180–$280 including the part. Safety note: if you ever smell gas at the dryer, shut off the appliance gas valve, ventilate, and call from outside — (720) 447-8577 or Xcel Energy at 1-800-895-2999.
Step 6: Check the Gas Valve Solenoids (Gas)
What to check: This is the classic follow-on to step 5: the igniter glows bright, you may hear a click, but no flame ever appears. The solenoid coils that open the gas valve weaken with age and can no longer pull the valve open even though the igniter proves the circuit works.
What it indicates: Failed gas valve solenoid coils — the second most common gas-dryer failure after the igniter.
DIY fix: None recommended; this is gas-valve work. Call a tech. Repair runs $220–$330, and coils for the major platforms are stocked.
Step 7: Check the Thermostats and Thermistor
What to check: The heat circuit passes through a cycling thermostat (regulates temperature), a high-limit thermostat (backup safety), and on newer machines a thermistor feeding the control board. Any of them failing open blocks heat. Each should read closed/continuity at room temperature; a thermistor should read a resistance value that changes with temperature (spec varies by brand).
What it indicates: A failed thermostat is often collateral damage from the same overheating event that blows thermal fuses. On Samsung dryers, a failed thermistor commonly throws dH or HE error codes instead of heating.
DIY fix: Testing is DIY-friendly with a multimeter; replacement difficulty varies by location in the cabinet. Call a tech if: multiple components test bad or you're seeing error codes — at that point a full heat-circuit diagnosis in one visit beats replacing parts one at a time. Thermostat repairs run $140–$220.
Symptom Quick-Reference Table
| Symptom | Likely Cause | DIY Fix? | Repair Cost |
|---|---|---|---|
| Tumbles, no heat (electric) | Half-tripped 240V breaker | Yes (reset) | $0 |
| Long dry times, then no heat | Vent restriction → thermal fuse | Vent yes, fuse maybe | $0–$220 |
| No heat, fuse tests fine (electric) | Heating element | No | $180–$280 |
| No glow at burner (gas) | Glow-bar igniter | No | $180–$280 |
| Glows bright, no flame (gas) | Gas valve solenoids | No | $220–$330 |
| Overheats or dH/HE codes | Thermostat / thermistor | Test only | $140–$220 |
When to Call (720) 447-8577
Breaker and vent check out but still no heat? The remaining causes — thermal fuse, element, igniter, gas valve, thermostats — are all standard single-visit repairs. Service covers every major dryer brand in the Denver metro — Samsung, LG, Whirlpool, Maytag, GE, Kenmore, Bosch, Electrolux — with a $75 service fee waived on repair approval and a 1-year parts-and-labor warranty. See the full dryer repair service for pricing.
Five-star rated on Google with 121 reviews. Serving Highlands Ranch, Denver, Littleton, Centennial, Aurora, Parker, Castle Rock, Lone Tree, and Greenwood Village. Heating elements, thermal fuses, and igniters for the major platforms are stocked on the truck — most "dryer not heating" calls become same-day repairs. Related reading: why dryers stop heating, dryer takes too long to dry, and how to clean a dryer vent.