Gas furnace with spark igniter. (Heil/HQCO Forced Air System Model number NHGE075CF01). Circuit Board does not have diagnostic lights. S8600m ignition module.
When I call for heat the inducer motor comes on, stays on for a second or two, then goes off. It will do this 5-10 times before it finally stays on, sparks then ignites. Once it goes through this cycle it will ignite and run fine (it never shuts down during a call for heat). I tried several items as did an hvac tech but the problem persists.
I tried the -
Vent is clear
Cleaned/replaced tube and cleaned inducer motor opening
New High Limit Switch
New Pressure switch
New Circuit Board
Rollout switch at burner
Any insight to this issue is greatly appreciated.