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What is the make and model please, some dehydrators only have fans and no heating element. Here is a link to the manual which has a phone number to call if you still have problems: http://www.nesco.com/customer_support/owners_manual_download/english/ http://www.nesco.com/products/Dehydrators/
Does the fan run and just won't heat or is it completely dead. If the fan runs ok then look at the temperature dial. That is the thermostat. It could be bad. Next to check is the heating element itself to see if it isn't open. There's an inline safety device that may have opened too. It looks like a small silver cylinder with one end narrowing to a point. That usually goes first. Try googling Nesco parts to see if any parts are available.
Take apart the bottom unit that contains the heating element. Hopefully it's put together with phillips screws. Mine are not. I'd have to drill out the brads that are holding it together. Once it's apart, use an Ohmmeter to check the heating element. Be sure to disconnect the fan from the heating element when ohmming out the element. If the element is open electrically, replace it. Good luck in finding a place to purchase a new element.
the heater element has to be tested with a multi-meter, the wires may be intact and it may look good, but looking good just isn't enough, it could also be a cut out that has tripped, there are normally 3 on a dryer, all need to be checked with a meter, easy job if you know what you are doing
hope i have helped you where to look next, if so please rate me
Before you replace the heating element, check the thermal fuse. All heaters have safety thermal fuse. This opens in case the thermostat fails. This is normally attached on or near the heating element, looks like diode. (When replacing, do not solder ! this will damage the fuse)