So this morning I cleaned the filters and turned power off to the furnace. Now power is back on, self test passes (inducer, igniter, humidifier relay (no humidifier hooked up), blower high, blower low), but when I put it back in operation heat does not come on - just th 'inducer.' the igniter does not try and come on under normal (not test) operation.
Suggestions welcome, and about a year ago, I replaced the igniter.
chuckb