You may simply need a new thermostat to resolve your problem. If the furnace filter is clean and the fan is already set to “auto,” try turning the temperature on the thermostat down. This shuts the furnace down and prevents your thermostat from calling for more heat. Your blower should run constantly until the heating cycle ends. The batteries to power thermostats are standard batteries that you can buy at most stores. Try turning the thermostat down a few degrees to give your furnace a break. Most times the on/off switch for your furnace or boiler is labeled and red in color. So if your blower fan just won’t stop running, the first place to check is at the thermostat. In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. If the heat exchanger (highlighted above) gets too hot, the furnace shuts down. We turned off Heat and it kept running, we tripped breaker and now thermostat says bat low. Your blower should run constantly until the heating cycle ends. In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. Check to make sure the fan is not in the fan “ON” position on your thermostat. Sometimes, the furnace is running constantly to keep up with the temperature, especially if it’s really cold outside. Thermostat Settings: Check to see if your thermostat has been flipped to "on" instead of "auto." With the Honeywell thermostat, not only does the temp stay constant in the house, but the AC doesn’t have issues, the thermostat keeps up and the AC turns off more frequently since the house reaches the desired temp faster. You’ll also want to check the batteries in your thermostat from time to time. This is a common problem for homes with an undersized cooling system. A clogged furnace filter can cause a furnace to shut off. Insufficient charge in the battery causes your thermostat to keep turning off and on frequently. It is an oil furnace. Next, make sure that your temperature is properly … 2. If that isn’t the problem, then you’ll want to examine your thermostat. The wiring could be old and need replacing, it might need new batteries, or it could be the location of your thermostat. If your thermostat is wired incorrectly, this could explain why the unit refuses to shut off. Well, that’s not normal. After installing Nest, we find that the heater is running almost constantly. There are a couple potential reasons why your heating system won’t turn off: Bad thermostat: A faulty thermostat can normally be repaired. If your furnace goes off on high limit or if one of the rollout switches are open then the furnace fan will run all the time because the furnace control board is telling the furnace that the furnace has over-heated and the fan runs to cool the furnace down. The main control board is Electron B89322B. If you forgot to charge the battery and your thermostat keeps running with the weak battery, it can affect your home HVAC … You can even detach it from the wall. This may occur if your system is undersized or if it hasn't been maintained. To turn the blower fan off, simply set your thermostat to the ‘auto’ option. my furnace keeps running even though honeywell thermostat is set at for 72. The Honeywell thermostat keeps … Frequent Cycling: If the furnace seems to be constantly cycling from “Off” to “On,” check for a clogged air filter, improper air flow, or a bad thermostat setting. Malfunctioning: If the thermostat isn’t working properly, it can cause short cycling. Replacing the thermostat with a brand new one should help solve … Battery operated thermostats need sufficient power to keep your thermostat running efficiently. In this situation, you can either invest in a bigger and more power cooling system, or you can wait until the weather get cooler outdoors. Restart your Nest Thermostat by pressing the display for about 10 seconds. 4. One is located downstairs and one is upstairs. What is wrong when the thermostat is turned off but the furnace still keeps running . But on the rare occurrence it does, there wouldn't be any air blowing over the heat exchangers which would cause your furnace to go off. ... RV Furnace Stops Running Overnight. Dust and dirt restrict airflow—and if the filter gets too clogged, the heat exchanger will overheat and shut off too quickly, and your house won't warm up. 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