The dryer could have a broken flame sensor, gas valve coils, high-limit thermostat, operating thermostat, thermal cut-off fuse, thermal fuse, igniter or timer. Where is the thermal fuse on a dryer? Thermal fuses are installed on the dryer's exhaust duct. Typically, you must remove the back panel of a dryer to access the fuse.
Ensure to shut off electrical power to the dryer before attempting to locate and troubleshoot the fuse. How long should gas dryer Flame stay on? What wrong when your dryer stops heating? Another possible cause for a dryer not heating up could be attributed to a faulty thermal fuse.
Once a dryer's thermal fuse has blown, it is no longer of any use. But after it heats up, because of its proximity to the igniter, it opens routing power to the valve solenoids to open the valve and release gas.
The flame switch rarely needs replacement. Check for continuity across the switches terminals. There should be no resistance measured when the dryer is cool a closed circuit, allowing electricity to flow. The hi-limit thermostat is a relatively reliable dryer component and is rarely the cause of dryer not heating problems. Test: Disconnect all connecting wires and check for continuity across the hi-limit thermostat or sensor set. The thermal cut-off is a set of two thermostats, one of which will not reset once cool.
The thermal cut-off needs to be replaced as a set. If this set of dryer parts fails, you will need to check your dryer and home ducting for clogging. This type of safety thermostat does not just fail for no reason. If the non-resettable fuse has blown out, you need to check and clean your home ducting! Test: Disconnect all connecting wires and check for continuity across the terminals. The thermal cut-off should be closed allowing current to flow at room temperature. This thermostat is usually closed, allowing electricity to flow freely.
Faulty cycling thermostat symptoms could take the form of very high dryer temperatures, blown out thermal fuses, or no heat. The cycling thermostat works with a thermostat heater to achieve lower dryer temperatures, such as low and medium heat settings. Test: Remove all connecting wires and test for continuity. As the dryer heat source is cycled on and off, temperatures can be observed. Timers are expensive, rarely fail, and are often misdiagnosed.
Resistors are usually located on the wires connecting to the switch, but sometimes within the switch itself depending on your model. Test: Disconnect all connecting wires and check for continuity across the switch and all wire harness resistors.
If you have a solid-state control board, visually inspect it for burn marks. Remove all connecting wires and check for resistance across the two terminals of the heater. Over time, your ignitor can burn out and need replacing. Even though the dryer uses gas to create heat, the control panel requires electricity to operate. Rotate the gas valve handle to turn off the gas supply to the dryer. Remove the screws from both ends of the control panel.
Raise the front of the control panel and rotate it away from the dryer top. This exposes the two screws holding the top of the panel to the dryer. Remove these two screws. Lift up on the top panel and slide it off the dryer cabinet. Find the two clips along the seam between the front door panel and the bottom service panel. Push a slotted screwdriver into the seam at the clip locations to release the bottom service panel.
Pull the service panel away from the dryer to expose the door springs. Disconnect the two-door spring from the bottom right and left sides of the door panel. The flame sensor opens the gas valve once the ignitor glows hot enough to ignite the gas. If the flame dies inside the burner assembly, the sensor reacts by closing the gas valve. When the flame sensor fails, the ignitor may glow, but the gas valve will remain closed. A failed flame sensor could also interrupt the flow of electricity needed to heat the ignitor.
The ignitor mounts inside the burner assembly near the gas valve. When all parts of the dryer are operational, the ignitor will heat and begin to glow, producing enough heat to ignite the gas once the valve opens. The ignitor can also lose continuity.
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