This situation on improper vent piping is getting to be bad news. I took back a dryer since the folks who bought it complained it would not heat after one day of use. In checking the thermal fuse it was open. I replaced it and told them they would have to revise the vent piping at their house or it would happen again. These fuses are costing me about $15 and I wondered if any one has a cheaper source of these thermal fuses that are reliable.