A furnace not kicking on is one of the most alarming things of the winter. Give the furnace a minute or so for the fan and the heat to kick on. In the case of a thermostat connected to a furnace, set the thermostat temperature five degrees higher than the room temp. Turn on the furnace power and watch the furnace. I turn on the thermostat, the fan turns on then the furnace lights after a few seconds, the furnace goes out within 5 seconds tops. You can use HOLD mode to test thermostat operation. Wait approximately 30 seconds and then turn the thermostat back on and increase the temperature to the desired level. I figured it was the battery on the t-stat so I replaced it. You also need to ensure that the thermostat is set to the heat position. "Heat" "Heat On" Fire Icon; Sun Icon . One thermostat is the master meaning that it must be set cool to push the system to ac. The lockout condition can be reset by turning the thermostat off and reducing the temperature to a value which would not cause the furnace to turn on. Turn on the Heat switch. If it’s still not on, set the thermostat to 90 degrees Fahrenheit. YES – Continue to the next step. Any help would be greatly appreciated. This started happening a couple of weeks ago. The blower will turn on if I turn the thermostat to the fan position. Let’s look at why your heat won’t turn on. Display got real dim, so I just changed the batteries in it. You can temporarily bypass the thermostat and your house will be warm in no time. You press the thermostat up a couple more times and nothing. You cannot see it without removing the cover as it is fastened to the back. 2 Remove the thermostat’s cover. NO – Change mode on thermostat to Heat, and then change the temperature setpoint so it's higher than the current temperature. This next step is to tick off the set point calibration test. The thermostat is a crucial part of your home’s HVAC system: you can’t control your air conditioning and heating without it! While you watch conditions at the furnace, have a helper turn the thermostat all the way up, as high as it'll go - thus well above room temperature - while at the furnace you WATCH the BURNER and the fan limit control. 3 Use a soft brush or vacuum with a brush attachment to gently and carefully remove dust and dirt. All gas appliances are set to operate with a standard supply pressure of approximately 3psi. If your furnace kicks on when you manually increase the temperature, everything should be working properly. Make sure the thermostat is turned to the cool position, and the fan switch is on auto. The motor has to spool up and close the circuit on a small switch called a sail switch behind the blower wheel cover. This power cycling is a literal snap with many smart thermostat models. The other two thermostats will kick on the air handlers but not the compressor causing warmer air into those zones. I have Ultra II 90 high efficiency furnace maid by Magic Chef. The first thing you’ll want to check is your thermostat’s settings. Give your system a bit and see if it shuts down. Suddenly the ac condensor outside will not turn on unless that one thermostat is calling for cool air. So if your thermostat is not set or working properly, it might never tell your furnace to kick on. Wait to hear the clicking sound that indicates the furnace has kicked on. If your house has a programmable thermostat, a fault in it could cause the thermostat to turn the furnace off and on at inappropriate times. Depending on fuel type you may hear a buzz or click of a gas igniter or the whir of the oil burner, or the click of a relay on an all-electric heater. Other Causes. Flush out drain lines. The thermostat does not light gas, it starts the motor. If your thermostat is broken, you don't have to shiver until the repairman can come or until you can get to the store to buy a new thermostat. A thermostat is a switch that can automatically turn on a furnace when a set temperature is reached. If the burners come on and the blower starts, then the thermostat is defective and must be replaced. If your furnace overheats, this sensor will trip, causing the heat to turn off. If a thermostat is thought to have a problem then it can be bypassed with a jumper wire. 1 Turn the power off to the heating system. The transformer steps down 120 volts to the 24 volts the thermostat needs, and … Turn off its power for ten to twenty seconds. Set the temperature lower than usual to turn on the air conditioner. High-efficiency furnaces can drain off several gallons of water a day in heating season. Step 3 – Balance the Two Temperatures . That did not solve the problem. The sail switch then sends power to the high limit temperature control. Troubles with your thermostat. These thermostats are called low voltage because they run off a transformer that reduces line voltage from 120 volts to a level somewhere between 12 and 24 volts, depending on the brand of furnace you have. Turn the thermostat up as high as it will go to try to kickstart your furnace. But an extremely low battery can take up to an hour to charge. Thermostat Screen . Next check and clean the furnace’s flame sensor. How Does a Thermostat Turn on a Furnace? If the thermostat has two parallel metal strips, wipe them off with a soft cloth. Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off. You just need to adjust the existing one, following three simple steps: (1) adjust the thermometer; (2) level the thermostat; and (3) adjust the anticipator. If it doesn't, there could be something wrong with the thermostat. On an electronic-ignition furnace, turn down the thermostat or turn the power switch off and then on again to reset the ignition control module. If you do not be attentive about this issue, then your thermostat may get harm because of the reason that fan should be switched of after two or three minutes that you switched off the furnace. Vince First and foremost, it’s worth pointing out that there are ways to prevent any of this happening in the first place. I have a NOMA Programmable thermostat attached to my furnace. At that point, the furnace should kick in. However, If I go down to the basement, and flip the power switch off and on, the furnace starts, and runs for about 10 minutes. I know the furnace is working because it will come on and turn off as it should for the first floor which as I said above is controlled by a separate thermostat. 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