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.
