[macgyver]

The duo therm under the sofa quit producing heat ,everything else seems to be working, the several seconds delay at start up and it runs the fan a minute or so after turning down the thermostat (as if it was a cool down mode)
I took the furnace to an old time RV shop and they refused to work on it saying they are problamatic ! They did say that a new circuit board might fix it ?
I shook out a bunch of well baked mud wasp nests ,which probably affected the performance ! Any Ideas ?