I have a Concord 80% furnace apx. 4.5 years old. It has not been used for 6-7 months as the tenants were not paying the gas bill. Now that they are out, I went to start it up... and nothing. I get the igniter to light (M shaped Norton) and the system cycles, blower runs, but no "click sound" happens to feed the gas to the burners. I was told that it "may be the switch", but the furnace supply place stated it may be the rollout or need a limit reset. I have switched it off and waited, then switched it back on, but no luck. He also stated to make sure I was getting 24 volts to the gas valve, otherwise it would not supply gas. I will review all these with the schematic, but wanted more opinions as I am going out of town for 1.5 weeks and need to get it working today so the pipes do not freeze (I am in Michigan, Detroit area). Any help would be greatly appreciated.

Erin

They gave you some good information. If this is a 90 % concord check for venting and pressure switch issues too.