I have a Beckett Model "A""AF" forced hot air oil furnace. The furnace has a Tjernlund power venter, model HST-1.
Since the middle of December 2010 my furnace occasionally stops working. When I hit the reset button it always starts and runs smoothly..sometimes it will not start the next time the thermostat calls for heat, but normally it does continue to operate for an extended period(days). The problem seemed to start soon after I did a bathroom remodel where there was a lot of drywall dust.(possible cause?)
I called a service company who came out and serviced the furnance, they said they didn't find anything wrong, but they performed a standard cleaning. A few days later furnace stoped again, I called the service company again and the tech came out ...he couldn't find anything wrong. On a whim I decided to change the Honeywell ignitor myself..that didn't solve the problem.
For the past two months I've been keeping track of when this occurs. I have a programmble thermostat which is set to raise the heat to 68 degrees at 4PM, sometimes when I get home from work the house has not been warmed to 68 and the ignitor reset light is lit. Everytime this has occured in the past 2 months it's been either raining or snowing outside(high humidity)????? Could it be a problem with the power venter?
Oil tanks are in the basement, caps are tight on fill tubes.
Any advice would be appreciated....I've spent too much on random service calls w/ no results.