Dryer hums on 240V

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  #1  
Old 07-27-18, 10:57 AM
J
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Dryer hums on 240V

Dryer delivered and installed. Will not run just hums. Drum light is on. Installer says its electrical panel.
We tested the following for 240V
Breaker
Wires on back of outlet
Plug continuity
terminals on back of dryer.
We got 240V at all points.
Swapped out wires on breaker panel with breaker for AC. Dryer ran for about 5 minutes then stopped and now just hums.
Swapped wires back, it was getting hot and we neded AC back on.
Dryer light on but just hums.
We are scratching our heads, they replaced dryer and same thing.
John
 
  #2  
Old 07-27-18, 11:14 AM
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Electric dryers require a 120/240 volt circuit, the controls and motor run on 120 volts only. You checked for 240 volts at the receptacle, but did you check for 120 volts; one hot wire to the white neutral and then the other hot wire to the white neutral? I would be checking for a loose or bad neutral connection. The installer should have checked for proper voltages at the receptacle once he discovered the dryer would not run. It's also possible the dryer has a problem, but since the second machine did the same thing it kind of points to the circuit.
 
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Old 07-27-18, 11:18 AM
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Yes Joe, sorry, we did test both sides of breaker,plug and contacts on dryer for 120v also. it's there.
John
 
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Old 07-27-18, 11:22 AM
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I'd go back over all terminations and torque them once again (at the breaker and neutral bus too), but this time, leave the cover off the connections at the back of the dryer. Plug the dryer in and carefully check voltages at the terminal strip on back of dryer while someone else tries to start it.

If voltages check out, there is a problem with the dryer.
 
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Old 07-27-18, 02:12 PM
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Dryer hums sound like a bad motor. Have somebody hold in door switch while you push start button and turn drum. If drum starts to run motor is bad. Have Co. replace dryer.
 
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Old 07-27-18, 02:44 PM
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I would believe the suggestions to test the dryer for issues may be a lost cause if this is the second new dryer and it does the same as the first new dryer. The odds of getting two bad new dryers seems to me to be astronomical.
 
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Old 07-27-18, 05:08 PM
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Sorry I missed that this was second dryer. You must have 120 volts from outside terminal to center terminal/ Both outside should to center will read this 240 volts to both outside terminals. Anything different you have a electrical problem..
 
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Old 07-28-18, 11:04 AM
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You may have to carefully check for voltages at the back of the dryer with it connected and turned on.
 
 

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