Dryer Spins But Will Not Heat: Gas and Electric Diagnostic Guide

This page covers what we actually check on a service call. If your dryer spins but produces zero heat, follow the order below. If you want to skip the homework and book a visit, call us at (252) 651-8162.

The single most important thing to understand

Dryers fail more from blocked vents than from any other cause. When the vent restricts, hot air cannot leave the cabinet, the temperature climbs, and a safety device (thermal fuse, high-limit thermostat, or thermal cut-off) blows to protect the unit from fire. If you replace the safety device without clearing the vent, the new one blows in days or weeks. We have replaced thermal fuses on the same dryer three times for customers who refused vent service. Do the vent.

Electric dryer diagnostic order

Step one: thermal fuse

Behind the back panel, mounted on the blower housing. A 240-volt thermal fuse that has blown reads open on a multimeter. We replace it, then clean the vent, then test. Usually a $15 part, plus labor.

Step two: heating element

A long coil mounted in a chamber behind the drum. If it has burned through, you can often see the break. If it looks fine, we test continuity. A bad element reads open or shorted to ground.

Step three: high-limit thermostat

Mounted on the heater housing. Trips when the heater chamber overheats. If it stays tripped, no heat is delivered. We test and replace.

Step four: cycling thermostat

Controls cycle temperature. Less common as a no-heat cause, but possible.

Step five: timer or control board

Rare. We check the heat circuit at the timer and confirm voltage is reaching the heater. If voltage is missing, the board or timer is at fault.

Gas dryer diagnostic order

Step one: thermal fuse

Same as electric. Behind the back panel, blown means open. Replace and clean the vent.

Step two: hot-surface igniter

Glows orange to ignite the gas. Igniters crack from thermal cycling, typically after seven to twelve years. If the igniter glows but the dryer never lights, the igniter may be drawing too little current to trigger the gas valve. Replace with an OE part.

Step three: flame sensor

Senses the igniter heat and signals the valve to open. A failed flame sensor will prevent gas from reaching the burner even if the igniter is good.

Step four: gas valve coils

Two solenoid coils on top of the gas valve. They open the valve when energized. Coils fail open or shorted. We test resistance and replace as a pair.

Step five: high-limit thermostat

Same role as in electric. Trips when the burner chamber overheats due to vent restriction.

Pricing chart for common no-heat repairs

When the vent really is the issue

If your dryer has been taking three cycles to dry one load for months, your vent has been restricting slowly. Lint accumulates at the cap, at every elbow, and inside flexible foil hoses. A full inspection from the machine to the exterior cap with a borescope is the only way to find every restriction. We carry a forty-foot brush kit and replace flexible foil with rigid metal duct where possible.

Related

For full dryer service details see the dryer repair page. If you also have a washer issue, the washer service page covers the laundry-pair playbook.