The thermostat is a basic Honeywell digitial. System keeps running after it reaches its' set point but it is blowing cold air? If you find yourself thinking, “Why does my furnace shut off before reaching the temperature I’ve set”? ON makes your furnace’s blower run non-stop but AUTO will tell your furnace’s blower to run only when heat is being produced, so it should shut off once your home reaches the desired temperature. 0. There are also a set of switches in the unit that relay the thermostat demands to the unit. If the fan stays on after this period, then it starts pushing cold air into the house, which could account for the uneven temperature control. The furnace circulates the air it warms through the house by means of a fan. I have a Lennox electric furnace (heat pump w/ aux heat I believe) that's about 10 years old. Any thoughts on what can be adjusted to fix this. Lennox furnaces are quality units; however, similar to other furnaces, The only way to stop the furnace is to turn the temp on the t-stat all the way up and then all the way down, then it will stop running. My furnace's motor keeps running after heating the home. Air feels very fast, brief, and harsh out of vents in home. A clogged furnace filter can cause a furnace to shut off. We have 3 zones Only the zone controlled by this thermostat is affected. Eugene Silberstein Member Posts ... inside is a deal called a fan limit switch. When your furnace keeps running after the temperature has been reached: Check the blower motor – See whether it’s your blower motor or the whole furnace that’s running non-stop. I have a programmable thermostat that lets the temperature drop at … All other items such as reset, updating to latest SW etc. If heat keeps running (more than a couple of minutes if you have warm air heat), something else is wrong. On a normal 32-degree cloudy day, to hold 68-degrees, furnace cycles on 4-5 time/hour. Check the vents. Details. Thermostats will often fail after a number of years of use. Specific. It blows warm air out of all of the registers for around four to five minutes and then shuts off well before the temperature has reached 68 degrees. Posted by TLC - November 24, 2015 - Energy Efficiency, Furnaces, General, Heating A furnace that is running properly cycles on and off to maintain the temperature in your home. I am new to the forum and also just purchased a TH with a very old GE air forced gas furnace (installed 30 years or so ago). The furnace blower motor is often run on a separate circuit (120 vs 24 V) which is controlled by it's own fan limit switch. I have a York model number ahp24b3xn21a furnace. Why is my furnace running constantly? ... Carrier 58SXA Gas Furnace shuts off before temp reached [ 9 Answers ] I have a Carrier "Weathermaker" 58SXA gas furnace that has recently starting acting up. I also followed one thread where it was suggested to switch G to Y1 and Y1 to G wires. The furnace keeps running and continuously heating after the set temperature is reached. It is supposed to stay on for two to three minutes after the furnace shuts off in order to push the last of the warm air out into the house. Most units run for a set amount of time after reaching desired temp. Hello! “Winter is getting colder in Michigan, and my family is having issues with our furnace. Test the thermostat by setting the temperature to one or two degrees warmer than room temperature. If it’s cold, the blower alone is running. Jump to Latest ... 2012. even after the temp inside the house has been reached and passed. This switch keeps the blower running after the call for heat has been satisfied in order to extract the heat from the furnace, which is … It does this repeatedly and never actually heats the house. My furnace keeps running after the set temperature is reached. They control how long the blower runs after reaching the desired temp. During the middle of winter, a broken down furnace is something no one wants. Coleman electric Furnace blower keeps running after temp is reached. You are not alone. I have an old weil mcclain oil fired boiler with a beckett rwb burner and a white rodgers control unit. Fix this to hold 68-degrees, furnace cycles on 4-5 time/hour furnace shut off before reaching the desired temp this! Setting the temperature drop at … heat keeps running after temperature is reached to off... Set it to 68 degrees, and my family is having issues with our thermostat... If you find yourself thinking, “ Why does the blower on my furnace 's motor keeps running temp... 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