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Subject - Dryer
David Hyatt I had a service call 1 month ago about a dryer not working. I went and check power and it was wired for 110 volts. I changed the taps to get 220 to the dryer and it seemed fine. Three dryers later the customer says it will dry good for a little while the it is just cold air. Any suggestions before I return to the job?? I was thinking of hooking up the dryer with the back plate off then let it run awhile and see if there was a voltage drop while its under a load. Other than rewiring I don't know what else to try.
rabbitgun I think the dryer is suspect. I would put an amp clamp on it. If the dryer is cycling the heating coil out there would not be much you could do.(Unless your an appliance repairman as well.)
lctrc789 I agree unless you work on appliances, check the voltage, if you have 240 volts at the plug and the cord is wired right... I suspect the heating element may be gone or a switch has gone hay wire in the appliance.
David Hyatt But they had 3 dryers already.
kbsparky This sounds like the exhaust vent is partially clogged, resulting in extra high heat being generated by the elements. This can prematurely burn them out, or at the least, wear out the hi-temp overload from cycling on and off.

Someone clever rewired the dryer element to operate on 120 Volts, making it run at ¼ capacity, which of course will make the element's lifetime much longer under these conditions.

Did you verify that the ground and neutral connections were properly made while you were there? (see other thread concerning this issue)
David Hyatt Which thread?
kringles This one?
http://www.electricalknowledge.com/forum/topic.asp?TOPIC_ID=1358
kbsparky Sorry, my link didn't take. I have edited my reply for the link to properly work.
rabbitgun **************BUMP********************

Hey David, did you get this rascal figured out??? If so, what was it?
empty56 I know this sounds stupid, but have you checked voltage (phase to phase and both phases to nuetral) with the dryer plugged into the receptacle? Had a call where dryer quit working, appliance repair man said my electrical work was defective. I checked receptacle and got acceptable readings, plug in the dryer got 167 volts one phase to nuetral and 79 volts on the other. To make a long story short, we figured the homeowner ran a three inch screw through my power run when he mounted his kitchen cabinets. Ran a three wire temp power run from panel to dryer and dryer ran fine.