dryer wont work

[oleRocky]

I have a very strange situation that I need some advice on.

I finished my addition this last week and one of the rooms was a laundry room. My washer and dryer were out back in a storage building and I had run AC to the building for my washer and dryer. They worked fine out there but when I move my dryer into my house it quit. I checked my voltage at the plug (its a 3 prong plug) and I get 240 across L1 and L2 and 120 from the neutral across L1 & L2. So I started tearing into my dryer checking all of the connections, fuses, etc. but I couldn't find anything wrong. I called the appliance repairman and he said it sounded like an electrical problem so he said bring it in and they would plug it in and check out for $20. So instead of bring it in I took the same plug and wired it back out in the storage building and carrier my dryer out there and plugged it in and it works. So I went back and checked all my connections at the breaker box and everything is tight. I am way confused at this point. :?

I am using 10 gauge wire and the run is maybe 50ft. Do yall think that is to far?

[Vector]

Define "quit." Worked once buyt stopped working? Starts but stops right away? Doesn't work at all?

A three-prong dryer outlet has no "neutral" it has two hots and a ground. A four-prong outlet has two hots, a neutral and a ground.

It's a 30A outlet, right? 10ga. should be fine for that at 50'

Are you testing with a digital voltmeter or an analog one?

[oleRocky]

vector,

Thanks for the reply.

You are right the 3 prong has a ground and not a neutral, my bad.

Since I posted earlier I spoke to a local electrcian and he told me that I need to tie the ground wire to the ground and neutral bars in the breaker. So I went home and tried that and sure enough my dryer works now. Don't clearly understand why but he said the dryer had a computer in it that is looking for both.

Thanks again.