|View single post by hvacdrd|
|Posted: Wed Nov 29th, 2006 08:07 pm||
|OK, the pressure switch has nothing to do with the blanket over the return air, just a coincidence.
On power up with a call for heat, the exhaust motor should start first.
Check the pressure switch tubing for obstructions
Verify that the condensate lines are clear
Check the exhaust pipe for obstructions
If those check out ok then you will need to test the pressure(negative pressure) at the switch to move further.
If you are not sure what I am talking about let me know and I will try to explain it another way.