Modern dryers usually have more than one thermostat: a cycling thermostat that turns the heating element off and on to keep the temperature even; and either a high-limit or thermal thermostat that cuts power to the heating element if the dryer overheats. Modern dryers usually have more than one thermostat: a cycling thermostat that turns the heating element off and on to keep the temperature even; and either a high-limit or thermal thermostat that cuts power to the heating element if the dryer overheats. Dryer thermostats are usually oval shaped and about an inch and a half in length. Also, there should be two wires leading to each thermostat. Label these wires before you remove them so that you are able to correctly reconnect them later. At room temperature, testing the thermostat should produce a reading of zero. It can be worth spending $150 – $200 to repair a midrange or high-end dryer that's less than three years old, for example. While a new basic model costs only $300 or so, a nicer model would cost much more. Repairing it can extend its life so you can get your money's worth. Touch the left multimeter lead to the left side of the thermal fuse; touch the right multimeter lead to the right side of the fuse. Keep an eye on the multimeter needle; a needle that fails to move indicates a blown thermal fuse. If this is the case, don't fret: thermal fuse replacement is a simple task.
Cost and Repair Considerations As of 2012, hiring a repairman to install a new thermostat cost around $177, while purchasing the thermostats to make the repairs yourself cost less than $60. A new appliance can cost you anywhere from $300 to $1, 400.
Blown Thermal Fuse A frayed wire can cause a thermostat to keep going bad. A dryer will blow a thermal fuse if it's close to overheating. Each time the thermal fuse blows it can interfere with a thermostat's function and cause it to go bad, too.
The Role of the Tumble Dryer Thermostat: The heat thermostat on your tumble dryer is there to monitor and regulate the temperature being produced by the appliance when it is in use. If the thermostat isn't able to do this, it will trip as a safety precaution.
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Run a Vent Blockage test Make sure the drum is empty and then close the door. Press POWER to turn the dryer on and within 5 seconds, press and hold Adjust Time Up + Dry Level until InS or In appears on the display. Press and hold START/PAUSE to start the Vent Blockage test which lasts for approximately 2 minutes.
Replacing the Heater Element. The temperature of the air inside the drum is regulated using thermostats. Thermostats open and close an internal switch with respect to the temperature of their environment. There are two different thermostats in your dryer: the operating thermostat(s) and the limit thermostat.