Background: (I will try to be brief)
September this year, called HVAC company to downfire Carrier oil-fired hot air furnace with Beckett burner. Was a 0.75gph and now is a .65gph. Reason for downfire b/c furnace is oversized and I wanted a lower fan speed for noise issues at the return.
At time of this service, tech told me furnace ran great and efficiency tests,etc...were all good. (Barometric damper set at 0.04, see this for later)
Come October, i started using furnace for first time and damper was banging back and forth when burner was on. I posted here on this forum, suggestion, call back company.
So, I called them, tech came, said faulty nozzle. He "repaired" and said was running good again. I noticed later that the damper was now set at all the way to the left at 0.08 and that when burner ran, it did not open at all.
In previous years with the 0.75 gph nozzle, the damper had always been set at about 0.04 and would open about 1/3 of the way and be very smooth in it's position. Never was it set all the way to left at 0.08.
sooooo, now that it's been a few weeks and I am running furnace more, the damper is banging back and forth again; although not nearly as bad as the October visit, but at the same time enough that I know something is wrong. it seems to get better once burner runs a few minutes, but never as good as it was in previous years, not even close.
So, here's the dilemma, do I call back this same tech who I now am questioning? The service I am sure would be free, but I don't know if he can do it.
Or do I call the oil company who had been servicing my burner? This company always serviced it great. But I will have to pay them. I already paid $250 for the first guy to come out and do annual and also downfire and adjust fan speed.
Or do I simply let it run rough and wait until next year, and call back the good company to do the service?
Sorry to be so long, hard to explain whole situation briefly