Question about Dryers
You are correct. Though some dryers have bimetallic thermal switches and other types most are thermocouples or RTDs which provide the temp sensing voltage or current to the feedback control system microprocessor. It has either gone bad, has a loose connection or a mild short (which causes a coupling in that area not the heat), or the microprocessor is "glitching". If you find the leads for the thermocouple coming from the processor, most likely "K" type chromel-alumel, they are red and yellow, and there should be continuity. If it is an RTD , resistive temperature device, a standard platinum 385 should be 100 Ohms. Check that RTD or the thermocouple (the welded splice of the red and yellow wires) has not come away from it's intended location. If it is a mechanical temp switching device it will be physically broken and obvious when you see it.
Posted on Sep 10, 2009
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Posted on Jan 02, 2017
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