had same trouble with mine....took a little emery paper and sanded the thermo couple.....a little sanding....works great....let us know what worked....
that's a lot of ching in my budget....it'll lose half it's value in a few years....I'd look at used....and if you have to spend that much a higher quality DP would be more worthwhile to me....theres a bunch of them out there.....just my 2 cents
