I have a brand new gas furnace (KeepRite C8PN100F14B). It works well for a few days after it is installed. But after a few days the induced draft blower start immediately after heating run a heat cycle (even the thermostat now is satisfied). Then the induced draft blower keeps on and off very frequently (1-2 times/second). When we try to change the thermostat just one thermostat (honeywellTH 2210D) can make the furnace work properly but other three thermostats (including the old one that it work well when the furnace was installed) have the same problem and those thermostats work very well with other furnace and one of them is brand new thermostat. Any problem? Please help!! Thanks!

If it is newly installed, call the installer back to ceck it out. You don't want to do anything to void the warranty. Good Luck