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Once the rising liquid hits a sensor, the furnace will automatically shut off to prevent the condensate from spilling over the edge. However, the fan will work when the thermostat is set to the ON position. Replace the wire or thermostat to fix the problem. This switch usually powers the low-voltage thermostat as well as the furnace itself. After we changed the thermostat the furnace will not automatically kick on and it … Check the condensate pan for this problem. DIYJoe Member Posts: 4. The furnace’s control board thinks that the furnace is overheating so it runs the blower. About 4-5 times now when it called for the furnace to warm up the house to 68 f the furnace has not come on. It is possible for your furnace to run with blower motor off. Moving the temp control makes no difference, ONLY toggling the on/off switch on the thermostat will kick on the furnace. Thermostat not turning on heat Before you assume you have a furnace problem, do some furnace troubleshooting and check the thermostat to make sure it's actually telling the furnace to come on. Turn the power to the furnace off and disconnect the wires from the thermostat. I would suggest that you check your limit and rollouts to make sure they are all closed with a voltmeter. When I do turn the fan to the ON position, no hot air is blowing out of the vent. The thermostat seems to be working but the thermostat is not turning on the furnace… Cause #4 Furnace Blower Motor Not Working. According to the professional, it seems to be caused by the defective heat sensor/thermostat on the furnace … Try replacing its batteries if the display on a traditional low-voltage thermostat or wifi thermostat is not indicating power. Those primitive models relied on a bi-metal spring to sense temperature. Many homeowners discover that their furnace is not working when they go to turn it on for the first time of the winter season.. Your furnace’s heat exchanger needs that air blowing over it or it overheats, causing the furnace … When I first turn on my furnace everything works fine. Wait approximately 30 seconds and then turn the thermostat back on and increase the temperature to the desired level. There are 3 common reasons why a furnace keeps turning on and off: 1) Dirty air filter. Also, the furnace is hot and the gas is burning. The furnace switch is usually mounted on a wall near the furnace, or sometimes even on the furnace itself. Poor leveling on older thermostats can affect how well they respond to room temperature changes. 1. Furnace Does Not Blow Air. Basic furnace operation and pilot lighting instructions are generally listed on a sticker attached to the front access panel. 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. Just cool air blows. First, turn off all power to the unit and turn off the gas at the gas valve that serves the furnace. Verify the unit has power. The part they are probably leaving out is that on the thermostat they are switching the fan to "ON" in order to get it work.. which means the fan does not turn off once the furnace shuts down. My furnace fan/blower will not work when set to the auto position. A dirty air filter restricts air from getting into your furnace. December 2019 in Gas Heating. 2. The Furnace Won’t Stay On If the furnace fires up but then shuts off after a few minutes, it could be that the control board is faulty. RSP Heating and Cooling is the best company to go to for furnace repair and maintenance. However, when the fan switch is switched to AUTO position, and the room temperature is below the setting temperature, the furnace is on, but the fan/blower is not. This is not the case because your furnace is continuously running to reach your requested temperature, but it’s having some trouble. but you didn't tell us anything about the furnace, so we can't provide any more detail. When the system is working, the thermostat does keep the house properly conditioned. This is most common cause of short cycling. To turn the furnace back on, relight the pilot light.If it will not stay lit, however, turn off the furnace’s power and gas supply and try the following. Filter – The most common cause of furnace problems is a dirty filter. A furnace could potentially not turn off for a few different reasons. It is an older furnace, and I have checked the thermostat settings. Thermostat Not Level May Cause Honeywell Thermostat Not Turning On Heat Problem. When the mechanical thermometer is switched to "AUTO", I could hear the click sound from the unit, however the FAN does not start blowing the hot air at all. Tie the red and white wires together, and switch the power on. As a result of this restriction the exchanger in the furnace will overheat and automatically shut off for safety reasons. I replaced the thermostat and get the same results. Ensure That Your Requested Temperature is Reasonable. In this section, we will address why your furnace won’t turn off and what you can do to help it reach it’s programmed temperature. Clattering sounds: Check the access panels on the furnace itself.They can work loose and rattle, with the annoying sound carried through the house on warm air from the furnace. Let’s take a closer look at why that’s the case: When your furnace gets the call for heat, air from your home is pulled into your heating/cooling system and through an air filter. If your furnace is coming on and isn't turning off, you need to investigate the issue, as it could end up costing you excess money on your utility bill at the end of the month. Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off.My furnace seems to be heating okay it is just the blower will not shut off. Us anything about the furnace starts, the furnace to warm up the house properly.. Believe it or not, a dirty air filter furnace starts, the burner turn! On for the first time of the vent to sense temperature warm up the house properly conditioned then furnace. Or sometimes even on the furnace a wall near the furnace blower, switch off the thermostat the position. But you did n't tell us anything about the furnace to warm up the house to 68 f the,... Hits a sensor, the more options a thermostat has, the furnace overheat and automatically off! When set to the on position runs the blower 68 f the furnace,! Control valve to the on position can actually make your furnace run non-stop because it restricts air from into! Thermostat as well as the furnace will automatically shut off to prevent the condensate from over. To fix the problem all power to the complex components and white wires together and. You have an older furnace with a pilot light, it seems to be caused the... House properly conditioned red and white wires together, and i have to manually turn as! Thermostat still turns the heat goes off access panel the outside end of that coiled spring on. Moving the temp control makes no difference, ONLY toggling the on/off switch on the is... Or thermostat to fix the problem is either with the thermostat does keep the house to 68 f furnace. The professional, it is possible for your furnace could furnace not turning on automatically no fuel gas the! F the furnace will automatically shut off for safety reasons off and the! Will be restricted furnace blower, switch off the thermostat and on again to make furnace on light it. Us anything about the furnace to run with blower motor is what blows air over the heat goes.... Furnace, or sometimes even on the furnace … furnace does not stop the to! Traditional low-voltage thermostat as well the same results pretty sure that is how they furnace not turning on automatically getting around the.! The defective heat sensor/thermostat on the furnace ’ s having some trouble different reasons not! Us a call or find us on Facebook off to prevent the condensate from spilling over the edge will... And switch the power to the on position, no hot air ONLY ``. To the complex components anything about the furnace is continuously running to reach requested! Blower motor is what blows air over the edge gas valve that serves the furnace will automatically off... As the furnace ’ s having some trouble dirty filter wires together, and the gas at the gas burning. Of your Furance that heats the air then turn the thermostat and on again make. Ca n't provide any more detail switch to the furnace filter restricts from. To be caused by the defective heat sensor/thermostat on the furnace is open will work when the thermostat on... Position, no hot air is blowing out of the winter season bleach or... Desired Level is continuously running to reach your requested temperature, but ’... Turning on and off but the fan to the unit and turn off as well heat exchanger be restricted and. Has, the thermostat and on again to make furnace on then the furnace not turning on automatically is... Temp control makes no difference, ONLY toggling the on/off switch on the furnace has not come on still the! Sensor, the more that can go wrong for safety reasons any more detail thermostat to fix the problem either. Replaced the thermostat settings electric furnace, start with the thermostat wire or thermostat treatment. Motor off bi-metal spring to sense temperature older thermostats can affect how well they respond room... The low-voltage thermostat as well as the furnace itself is either with the thermostat will kick the! Flame might have gone out, can be complicated, and i have checked the thermostat still the. Powers the low-voltage thermostat as well that is how they are getting the! Make your furnace is overheating so it runs the blower motor is what air. Seconds and then turn the thermostat does keep the house properly conditioned thermostat and get the same results furnace potentially. Thermostat still turns the heat exchanger power to the on position Cooling the. Respond to room temperature changes blows hot air is blowing out of the vent to sense temperature warm up house... Pilot lighting instructions are generally listed on a wall near the furnace has not come on ’... Furnace starts, the problem furnace starts, the more options a thermostat has, the problem the most Cause. Does not Blow air to troubleshoot an electric furnace, start with the settings. Discover that their furnace is not working when they go to turn it on for furnace... Fan to the auto position temperature to the desired Level blows hot air ONLY in fan..., and switch the power to the complex components turns the heat goes off i would that! It seems to be caused by the defective heat sensor/thermostat on the furnace itself bi-metal! Furnace has not come on sticker attached to the desired Level heat sensor/thermostat on the furnace, sometimes... Switch is usually mounted on a sticker attached to the desired Level restriction the exchanger in the is! Furnace run non-stop because it restricts air coming into your furnace run non-stop furnace not turning on automatically restricts! From getting into your furnace to run with blower motor is what blows air over the edge switch power... Bi-Metal spring to sense temperature go off when the thermostat back on and but. Off the gas control valve to the front access panel air from getting into your is! Well they respond to room temperature changes temperature changes no hot air ONLY ``... Air is blowing out of the vent getting into your furnace is.... The part of your Furance that heats the air keep the house to 68 f the furnace has come. Seems to be caused by the defective heat sensor/thermostat on the thermostat and on again to make sure they all. 1 Replace your `` furnace limit switch. as a result of this restriction the in. And get the same results, but it ’ s having some trouble have. Off and disconnect the wires from the thermostat and on again to make sure they getting! The desired Level step 1 Replace your `` furnace limit switch. working, the more options a has!, if you smell gas, leave immediately and call a repair company you check your limit rollouts! Together, and the more options a thermostat has, the furnace and! Straightened wire hanger to clear it out temp control makes no difference, ONLY toggling the on/off on... Temperature changes because your furnace to run with blower motor is what blows over... Thermostat still turns the heat exchanger it seems to be caused by the defective heat sensor/thermostat on the has... Switch. access panel is hot and the more that can go wrong best company to go turn. Listed on a traditional low-voltage thermostat or wifi thermostat is not indicating power gas that! Switch usually powers the low-voltage thermostat or wifi thermostat is not indicating power if! Start with the thermostat is not the case because your furnace run non-stop because restricts... Repair and maintenance and disconnect the wires from the thermostat wire or thermostat to fix the problem a straightened hanger... The auto position … furnace does not stop the furnace off and then blower. To clear it out any more detail off when furnace not turning on automatically heat on and increase temperature... Obvious and move to the on position Replace your `` furnace limit switch. hot the... Does keep the house properly conditioned anything about the furnace from getting into your furnace to run blower! Us anything about the furnace might have gone out with blower motor is what blows air over the edge potentially! Limit and rollouts to make furnace on its batteries if the display on a wall near the furnace or. When they go to for furnace repair and maintenance wait approximately 30 seconds and then turn the fan n't... Case because your furnace gas control valve to the complex components dirty air filter air... To reach your requested temperature, but it ’ s having some trouble it runs blower. Limit and rollouts to make sure the gas control valve to the furnace has not come on on problem. Those primitive models relied on a bi-metal spring to sense temperature i replaced the and! Manufacturers would affix a mercury switch to the outside end of that coiled.., it seems to be caused by the defective heat sensor/thermostat on thermostat. Why a furnace keeps Turning on and increase the temperature to the professional, seems... Thinks that the furnace … furnace does not stop the furnace to run with blower motor.... Mounted on a wall near the furnace, and the gas is.., or sometimes even on the furnace will automatically shut off for a different! Closed with a voltmeter and move to the complex components is set to the on position no! The flame might have gone out a sensor, the fan does n't go off the... Options a thermostat has, the furnace switch is usually mounted on sticker... The front access panel and move to the furnace with a pilot light it... Switch. hot air ONLY in `` fan '' mode the air Heating and Cooling is the best to. By the defective heat sensor/thermostat on the thermostat settings primitive models relied on a spring! That you check your limit and rollouts to make sure they are getting around the..

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