Hey all, it's been a while, but I'm back with a new question. Thanksgiving morning I installed (with the help of my retired-HVAC-instructor father-in-law) a new gas furnace in my house. Everything went fine, except for an errant screw through the A/C A-coil. Oops, that'll need a recharge!
Anyway, the furnace lights properly, and the blower comes on to high speed shortly after. The problem is, once it's on, it will try to turn off and on again several times in the heat cycle. It never fully turns off, just "hiccups" as if someone cut the power quickly. So, you'll hear the fan spin up, then it sort of "dips", then comes back up, then maybe 10-15 seconds later, it does it again. Seemingly random...but it might do it 5-10 times in one heat cycle. It's very annoying, and I know it's not "normal". I've tried changing the jumper setting for the fan speed, and for the blower delay...no change.
Does this sound like a control board malfunction? Could it be my programmable thermostat? There's plenty of heat, the only issue is the erratic fan behavior.
Model TM9X060B12MP11, 95.5% 60K info here: http://www.micahvac.com/produse/123-heating/124-furnaces/120-lx_series_tm9x060_b12mp11.html
Any ideas before I make the call to the vendor on Monday? If there's something I could try this weekend yet, I'd love to give it a whirl.