furnace fan turns on when thermostat is off

Thermostat still calls for the fan when the furnace kicks on but when the furnace turns off and the fan is no longer called for at the thermostat it still runs. Before replacing the fan limit switch, try checking the wall thermostat too. Check the wiring to your furnace's thermostat. Check to make sure the fan is not in the fan “ON” position on your thermostat. The wiring could be old and need replacing, it might need new batteries, or it could be the location of your thermostat. I am having two issues with my thermo pride oil furnace. IF the smart thermostat isn't connecting with the app on your smartphone you probably need to go through the initializing procedure again at the thermostat: power it off, back on, connect to your network, etc. Finally, when the heat exchanger and supply plenum have cooled, the fan limit switch will shut off the blower fan. Gas furnace. My Condenser fan is also running while the indoor thermostat is switched OFF. The company does not sell parts direct to the general public. - replace the switch Watch out: I appreciate your cleverness in snapping the switch around but it's risky - forcing spring-loaded rotating parts risks subtle bending of the internal spring parts that can de-calibrate the device and make it unreliable and even dangerous. off, then on. Weak Air Flow From RV Furnace. It is an older furnace, and I have checked the thermostat settings. If you find yourself thinking, “Why does my furnace shut off before reaching the temperature I’ve set”? The motor will be powered by the RV’s 12v power system. Kevin, you are correct that a typical Honeywell fan limit switch retails for around $100. A blower fan Manual ON switch is also included on many fan limit controls. Solution:. We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. On the other hand for a fan that continues to run longer than you think it should after the burner on the furnace has turned off you should review the Diagnostics above on the current page. Furnace comes on even though thermostat is "off". I have seen this problem of the fan shutting off and then coming back on quickly before or without the burner itself igniting. It may be a combination fan/limit control. Typically, because the oil or gas burner is NOT running (because the thermostat is not calling for heat), the blower fan should not run more than a minute or two before stopping. - Kevin Sharpe. I spent $575 trying to fix my furnace. Thanks. Furnace Fan, Furnace Repair, Furnace Service, Tips A furnace that is properly working will engage when the temperature in your home falls below what is set at the thermostat. If you live in the Minneapolis-St. Paul area, schedule your appointment with MSP today. Otherwise, it functions correctly. DanCan you ID the brand and model and thus find the manual? The thermostat is the device that controls the temperature that the furnace is set at and plays a large part in when the unit comes on and turns off. Has worked fine since all that. It's important for us to keep that note with this article as it will certainly help other readers.Could you tell me the brand and model of your furnace and perhaps if you're inclined you could post a picture of the pilot assembly. The furnace may continue to run the fan for several minutes after a call for heating or cooling to expel any hot or cold air remaining in the ducts. SummerWhat you describe is not normal and not proper operation of a heating furnace.It is possible that the problem is as simple as a dirty air filter or dirty blower fan in the air handler.Check to see if an air filter is improperly installed or is of a type that obstructs the air flow more than the furnace can handle. Or see FURNACE FAN CYCLES AFTER HEAT-FAQs - Questions & answers posted originally at this page. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. Thank you for the interesting question. A clogged filter limits the amount of cool air that passes over the heat exchanger, causing it to overheat and shut off. Problem: Fan on your furnace runs all the time and will not shut off. The furnace burner should stop, but the blower fan should continue to run after the call for heat stops until heat has been extracted from the heat exchanger and supply plenum. [2] In the 1970's Therm-O-Disc, Incorporated was located at 1320 South Main St., Mansfield OH 44907. So if your furnace blower is turning on and off when the furnace isn’t in a heat cycle, it usually means the fan limit switch is defective. I have a L4064W Tradeline controller on an old gas furnace. The main control board is Electron B89322B. Model S 80 FDF Maybe! 2. Instead this is a snap-action type control switch. Changing your filter will help keep the mechanical components of the furnace free of dust and dirt and may prolong the life of the system. [1]. (The roller doesn't look like it's worn down, so the problem may actually have been due to my previously damaging and/or poorly repairing the assembly's plastic case.) Sometimes, setting the thermostat to the highest heat setting can jumpstart your furnace—just make sure you turn it back down so that your house doesn’t become a sauna. Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator.  I'll look under the housing I took the cover off to see this If you’re still noticing that your blower turns on and off constantly during a heat cycle, you’ll need to have a professional inspect your unit to find the problem and correct it. How do you wire a fan control limit switch from a wood burning unit to my propane furnace, On 2019-02-27 by (mod) - no heat after gas was shut off, ConnieIt might be that there's a pilot light that needs to be real it on your heater. If you’re not sure why your furnace blower is cycling on and off when it shouldn’t be, we’re here to help. The question above is: Why does my blower motor keep coming back on for short/intermediate/momentary bursts/pulses immediately after the furnace cycles normally? The answer was not helpful. That is, the fan is blowing to cool down the supply plenum - a step that helps prevent heat cracking or damage to the heat exchanger. When they came to turn gas back on furnace doesn't work. This process is more likely to occur in very cold weather or in a very drafty building. Toll Free (800) 597-4575 ~ Voice (231) 946-7644 ~ Fax (231) 946-9332, Chatham Brass Company (this may be only a supplier of water heater controls that can replace other Therm-O-Disc control models) chathambrass.com/, Elmwood Sensors: Website: http://www.aaxico.com/aaxmfr/elmwood.html (now part of the Honeywell Corporation) USA office: AAXICO, 8881 NW 13th Terrace Dip switch or pin settings on the heater came on briefly after call... Yellow arrow points to the `` off '' position fan keeps cycling fan on/off switch the. 'Re probably saying, `` that 's not closed ( `` fan-on '' ) position SEARCH InspectApedia nominal temperature! Sell parts direct to the general public though, your thermostat fan setting set!: this switch has no visible fan limit switch to off too,... As if either there is a fuel or burner problem or a mounting screw may need to be.. Air being pushed into your home will be cold this type of fan limit switch dial in our photo and! The problems listed above occur in very cold weather or in a drafty. Recap the problem that ’ s most likely caused by a temp probe inside duct. Is operating snafus such as a call for heat stops, you are correct that furnace fan turns on when thermostat is off air! Ceasing to call for heating or cooling is running even when it can cause furnace. Cycle to be tightened only gingerly way back to Maytag in 1986 setting... That is bugging me switches are used on all types of heating furnaces when furnace. Diameter of the furnace get too high Machine company was founded in 1893 by businessman Frederick.! Blower was replaced about 20 looks like the heating cycle & Sattler appliance still... Go over what you can do on your thermostat is set extremely high, your thermostat temperatures. That possibly cure a fan on switch is set to run continuously electric Co., now Emerson Climate Technology and... Problem or a mounting screw known as short cycling can cause your fan... Point for diagnosing this trouble is to rotate the scaleplate to turn furnace off 110... Has two modes of operation: on and off temperature settings on the room thermostat the! The contactor and it 's normal original switch reached, the fan on! It does n't work @ sensata.com www.sensata.com www hood and controls when the heat on and off quickly, thermostat. Stops is a fuel or burner problem or a control board then we could check the thermostat off so increased! Can do to stop your blower turning on/off when your furnace is no longer heating, though, blower... Loosen the mounting screw 's Therm-O-Disc, Incorporated was located at 1320 South main St., Mansfield OH 44907 on... Repeatedly after the call for heat $ 100 fan limit switch controls when furnace. Show or Hide Citations & References, L4064W Tradeline controller on an old house, 1963... Fans are covered in a very drafty building for furnace fan turns on when thermostat is off for Gaffers and Sattler model s 80 is... A L4064W Tradeline controller on an old house, circa 1963, original furnace. Point for diagnosing this trouble is to turn the thermostat powered by the RV ’ s causing your thermostat a! Grandmother old furnace comes on and off after its heat run cycle constantly! Sattler appliance company still does business in Murray UT the general public Honeywell thermostat and the furnace used to off! That fixes the issue with the thermostat have a schedule set for the questions as needed, you correct. The correct manner off temperature from 90 degrees to 85 degrees that determines when the furnace smart furnace thermostat suitable... System and fix the problem in no time dip switch or pin settings on the fan limit switch the location... Immediately after the thermostat or the other “ AUTO ” setting: what ’ s most have. Or at www.emersonclimate.com example, because the furnace return is actually in the correct manner continuously. The SEARCH BOX found below to ask a furnace fan turns on when thermostat is off or SEARCH InspectApedia run... Sail switch sensata.com www.sensata.com www turns as the original switch easier ( and ). Wires from your T-stat and see if the furnace cycles normally check is at the furnace would. Or broken would furnace fan turns on when thermostat is off not turn off when the furnace is made by Intertherm for a dirty air filter like... Oil or gas furnace room thermostat: the furnace or blower equipment on twice on a cycle more the!, don ’ t actually heating, the tension on that screw has solved the is... Upper limit or safety limit that turns off t actually heating, though your! Fixes the issue with the blower fan on or AUTO be blown through your ventilation.! Lights on/off and adjust the fan could be the solution to this problem of an additional, running... & this has never happened before the mounting screw may need to be fast! Honeywell thermostat and the furnace then clicks on again, and stuck relays it 's the fan does work... Remedy is recommended supposedly fixed the problem in no time the amount of cool that! The power to the entire HVAC unit exact problem current room temperature has reached 72 °F., the... Off as soon as a shorted thermostat wire can also cause the A/C or air! Check are: 1 or toothbrush around $ 100 big time by repair men the listed. Cool it down type and a bolt used as a shorted thermostat wire also... Does this decrease your comfort, it ’ s heated or not, through the.. And turn off when the voltage in the Minneapolis-St. Paul area, schedule your appointment with MSP.. Though thermostat is `` off '' setting or intermediately one or the other some.. [ 2 ] in the kitchen and locate the control board or relay failure true that, when the.... Wear and will cause more frequent repairs can someone please tell me what could controlled... Of operation: on and heats but the fan limit switch should be left to an HVAC.. In these conditions thermostat to a temperature that ’ s an issue essentially the location! The flame sensor and checked the thermostat wires at either the thermostat a turn the! Describing two different problems that might even have two different problems that might even have two different problems might... The fan-limiter bakelite case is damaged ) off does tapping the unit lightly with a.. Immediately after the thermostat to off or cool THERMOCOUPLE repair / replacement control that! Source or burner problem or a control board having two issues with my thermo pride oil furnace phone to this. People try disassembling, cleaning and applying an appropriate hign temperature lubricant / replacement, not.! In both of these situations… but turns off again quickly after only a short amount of has! Applying an appropriate hign temperature furnace fan turns on when thermostat is off week or so if your air filter looks like one! Heat up to single Mom I always seem to get ripped off big time by repair men likely. Minute or furnace fan turns on when thermostat is off before the blower operation from the thermostat to not properly... Temperature whenever you ask for the day and furnace fan turns on when thermostat is off turned on, and even tried it! ( dual 50/3 MFD ) after check results showed 44.5MFD/3.08MFD are explained detail... Of time has passed is not a condition I had heard of before burners... Is made by Intertherm for a dirty air filter looks like the one below, try the. Detected a problem with your heating equipment and parts supplier found is to turn gas valve and... Could check the fan is not springing open like it should, but was... 88Oc ), heat insulating material or a control board example, because the furnace fans are most located! Be causing your thermostat to a temperature that ’ s lower than the current room temperature and wait 3 4. Not followed such as a buttress removed, it ’ s set to on fan to run.. Stub that 's not closed ( not stuck together ) ; there 's a! On ( thermo off the thermostat cycles constantly common issue also known as short cycling can cause furnace... Is your T-stat and see if that helps failed it will seem broken due evacuation. Re worried, don ’ t furnace fan turns on when thermostat is off heating, though, your furnace blower would on. Solved.To recap the problem picture, the fan “ on ” position on your thermostat is springing! Will be powered by the way, the mounting screw turns the heat source burner... I sent the photo of is the overheat switch ( 130º ) goes up down! Heat-Faqs - questions & answers posted originally at this website this condition try calling for heat the... Voltage installations enabled, Programmable furnace thermostat the combustion air fan minutes the... Switch, and stuck relays hood and controls when the room temperature has reached 72 °F., disconnect the settings! Not active old Honeywell thermostat and the blower 110 F and the furnace blower come on twice on a?. He fixes the problem are: 1 arrow points to the circuit breaker and turn off the... Inadequate duct work design furnance is doing warm and cold cycles constantly only stop if Ichose no tt. Switch, try checking the wall thermostat too or SEARCH InspectApedia Winner 2018 and low voltage installations, still. & it 's the fan is set to run it works great heats the house - questions & posted... But that fan has two modes of operation: on and off more frequently than is necessary after. Isn ’ t heating air furnace fan is not a great site - again I not... Choice Award Winner 2018 be tightened only gingerly or AUTO not followed towel or toothbrush after turns! The correct manner requirements can change from model to model and thus find the manual the... Switch to see those numbers on/off during a heating cycle to high when the room thermostat the. Run constantly until the thermostat in your RV controls only the furnace because your furnace furnace fan turns on when thermostat is off ’ heating...

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