I have a Coleman Furnace in my mobil home and it keeps shutting off and won't hold a temperature. I have had a furnace company out and they replaced a gas valve but it did not help. To get the furnace to start back up I have to turn the thermostat off and then back on. It will run for a while the I have to do the same thing over and over with the thermostat. I'm on my 4th thermostat, from the cheapest to the most expensive. Can someone help.

Next time it locks out, look in little plastic viewer for a LED light to flash a code. I bet it is a pressure switch issue. It is so often is the problem in those Evcons.