If you have a faulty dryer thermostat, the dryer may keep the heat on for too long, causing the dryer to get too hot. If the cycling thermostat is defective, the dryer will not heat up. According to PartSelect, if the cycling thermostat in the dryer becomes defective, it will not be able to accurately sense the airflow temperature. It can cause the heater or gas burner to stay on too long.
Testing the thermostat is not easy to do, so you should first inspect the other more commonly faulty parts. If your test produces any other reading, the cycling thermostat needs to be replaced. The high-limit thermostat can also be tested. This thermostat is only activated when heat rises and trips the thermostat. Sometimes, the contacts may fuse together and no longer be active. Test the high-limit thermostat in a similar way as the cycling thermostat: Touch the terminals with the probes and replace the high-limit thermostat if you get a result other than zero.
They provide additional protection in the event that the heat generated by the heater coil does not move out into the drum fast enough.
A picture of a thermal cutoff is shown below. The frustrating feature of a thermal cutoff device is that it opens when its operating temperature is reached but then it stays open and will not close when the temperature drops down. In other words, the cutoff works once and then has to be replaced.
I have determined that this part frequently false alarms, resulting in a service call to replace it. Part number contains a new thermal cutoff AND a high limit thermostat. Install the thermal cutoff if you want to go back to the original equipment or install the high limit thermostat in place of the thermal cutoff if you don't want to mess with this thermostat anymore.
No liability is assumed by the author for the accuracy of the contents or damages caused by the use of these procedures. Search Please enter part or model number. Until the limit thermostat is replaced, the dryer will not heat properly. Overheating is essentially the opposite problem of a dryer that doesn't heat enough.
In many cases, the thermostat is stuck in a closed position, telling the dryer that it is not yet hot enough inside. Again, this is usually a problem of the limit thermostat. A dryer that does not start can be suffering from a variety of problems.
Another possible reason a tumble dryer does not heat up can be traced to a faulty thermal fuse. Once the thermal fuse has blown, it can no longer be used. If your dryer has a fuse, replace it. Open the dryer and find the thermal fuse so you can test it. Does the dryer thermostat need to have continuity? At room temperature the thermostat should provide zero crossing, so touch one sensor on one terminal and the other sensor on the other terminal and check the test display.
It should be bad. If it shows indefinitely, the thermostat is faulty. What does a tumble dryer thermostat look like? Dryer thermostats are usually oval and about one and a half inches long.
There should also be two wires going to each thermostat. Mark these wires before removing them so you can reconnect them later. At room temperature, the thermostat test should return a zero reading.
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