Purchased a Mr. Heater 75,000BTU unit. Installed unit with a horizontial flue through the wall and straight out 24" with cap.
Unit will turn on and ignite , but the heater trips off after several minutes. The LED indicator shows that the heat limit switch is tripping off. Have I got the venting wrong or the thermostat is wrong. I hooked the thermostat up with the R &W terminal connections for HEAT only thermostat bought at MENARDS. It is cold in there and my wife is disabled and we need to get heat. Talk with Mr. Heater and they have no technicians to look at the unit. Any suggestions.