Decided to start a new thread.
I've been reading through the "no heat" threads and have not found one with the same problem as mine...
Turned the Honeywell programmable thermostat to HEAT today for the first chilly day to make sure the system works and got nothing. The thermostat is working as I get the little fire icon on the screen and I hear it click but the furnace does not light. No fan unless I switch the switch from Auto to ON. AC works fine.
I had the wife switch on the thermostat so I could listen for any activity and I did hear a fast click that sounded like a pencil rattling. It was a fast click, not a slow click. It stopped after five seconds or so.
I've never lit a pilot light on this furnace in the three years we've been here-it normally lights itself.
It is a forced air natural gas central air system installed in the early 90s.
Decal says: Lennox Model C16-41W-00-1 MFD AT: 58 MLC LB-49075DC
A separate WARNING type decal has lighting instructions on it but says DO NOT TRY TO LIGHT BY HAND as it has an ignition device which automatically lights the pilot.
Any ideas where to start before I call for service?
I'm a DIY'er, rebuilt my own kitchen, and a car guy but have never fiddled with a furnace, so please take it easy on me.