I think you just dont have 220volts coming out the plug in the wall.
You may have 120volts on one side and just a few volts on the other side or 0volts. Your dryer runs on 120volts but the heather élément runs on 220volts.
You may have a burn or cut wire in the boxe in the wall or in the enter cable of your dryer.
Good luck.
Poutpout |