Service guy came by and went through a long checklist of maintenance items... so it was given a good cleaning. He said that it is a very simple furnace with regards to troubleshooting and that all of the checks turned out good... so nothing is broken in the furnace. His guess from his experience is ...

Thanks for the reply. The repair guy is coming over this morning to have a look at it so hopefully I'll know what the issue is real soon... and I'll post it here just for completeness and in case someone else with the same problem comes along.

I'll also call about the manual. Thanks!

I have a model DGRT070AUA furnace. After being out of town for Thanksgiving and coming back home... the house was cold. Cycling the thermostat control to the extreme left, extreme right, and then positioning it to the desired temp, the furnace would come on... and continue to run until the desired t...