furnace

time2roll wrote:
Buzzing on a DC circuit sounds like a bad connection.
Are you running on just battery power? Or unplug and see if the buzz continues.

Its running on a 4000 watt onan generator that came with the rv.I have replaced the thermostat with the one on ebay that i gave a description of.I have already had it serviced and cleaned.I had the delay switch checked which is no where near the sound.This is what has been going on before i did all this work and still no help.When i turn on the furnace it does what it is supposed to do.All the way up untill the burner kicks off and the fan just keeps blowing cold air.So i go to the thermostat and turn it up just a hair and i start to hear the sound that i described earlier and the burner kicks back on and all is well untill the next cycle.