Furnace Short-Cycling
2018 Furnace - Atwood/Dometic model AFSD20141 is short-cycling. I tried the following everything: Jumped the thermostat jumped the high temp limit switch jumped the sail switch removed disch...
Forum Discussion
agiannetti wrote:
Could it be a bad flame sensor?
Newer furnaces use the circuit board somehow along with the single probe and neg sparker for flame sensing. Older ones used a third probe that was the flame sensor. I suppose it could be a fault in the board to make for "bad sensor". I am not a furnace tech.
Besides what you have already done in the OP, if not done, IMO do a complete burner clean out as what to try, including the orifice. Check the wire connections on the blade terminals are tight for the probes too.
We need the furnace pros to jump in here! :)
"The older boards used a separate flame sense electrode, also known as remote sensing. Now they sense the flame through the spark gap, aka local sensing. You can sub a local sense board for remote, but not vice versa.
-- Chris Bryant "
