HI. This will be the result of a failed thermostat. There are a couple of thermostat inside the unit. Each thermostat should be tested for proper continuity. A thermostat can fail by being always on, no matter what the temperature. This switch would show continuity whether it was hot or cold. In this case, the heater will not shut off and the the dryer could dangerously overheat. Usually, this issue will cause the thermal fuse to blow, but for some reason, your thermal fuse did not blow. This is troubling,
The necessary actions are to test each thermostat and thermal fuse for continuity. Use the procedure below for direction:
The thermostats are usually grouped together. The are typically oval in shape and about an inch and a half in size. They may be on the blower housing, under the lint trap or inside the vent line. There should be two wires connected to each thermostat.
Label the wires and connections so that you can properly reconnect them later. The wires are connected with slip on connectors. Firmly pull the connectors off of the terminals. You may need to use a pair of needle-nose pliers to remove the connectors. Inspect the connectors and the terminals for corrosion. If either is corroded they should be cleaned or replaced.
To test the thermostats and fuse, set the multimeter to the ohms setting X1. Touch one probe to each terminal. You should get a reading of either zero or infinity. At room temperature, the thermostats should have a reading of zero. When the thermostats are heated to their limit temperature, they should switch off and you should get a reading of infinity. The fuse should be tested at room temperature for continuity.
- Additionally, The only other culprit in this situation will be the actual timer control device. The timer dial cog may be fused, thus, causing the heater to stay on. If all the internal thermostats and fuse test out ok, kindly replace the timer.