How To Check Furnace Blower Motor

When the motor generally goes south (the motor itself) it will trip the breaker. I checked to make sure there was 24volts at the other end of the Y wire at the furnace control board while the fan was off and there was. Hi all, I've got a gas fired, forced air furnace with a programable thermostat. Check temp rise 74 138 rate 44/75 low gas pressure. Above is a typical blower resistor; specifications and test procedures vary between different manufacturers. Cleaning the motor helps it run efficiently, and that makes it easier for other furnace parts to do their job. DiversiTech WG840463 - PSC Multi HP Furnace Blower Motor (1075 RPM, 115 VAC) - The Multi-Horsepower motors are specially designed to cover a range of applications. This usually solves the problem. The following video will show you haw to check the pulley for excess wear. Found some diagrams on the net regarding how to test module so that is next. the furnace runs fine for first heat cycle(2-3 minutes) and then will not ignite producing heat to continue cycle. Multnomah Heating & Air Conditioning is the only HVAC company that offers retail furnace parts and custom-made Weather-Rite filters, unique to the Multnomah Portland and Greater Portland area. Over time, it can eventually wear out. Check the cap if you have a way. Any way to lubricate a blower motor?? Recently my heater blower motor has been sounding like a rabid cricket during mating season. If your blower wheel is out of balance it will roll and then rock back and forth. In a previous article about gas furnace maintenance, we discussed the different furnace parts that need to be checked and maintained regularly. An industrial furnace or direct fired heater, is an equipment used to provide heat for a process or can serve as reactor which provides heats of reaction. 1/5hp 1-speed blower motor. Even though it's in a housing, it lives in the engine compartment, so it's not unheard of for foreign objects to get sucked into and wrapped around or caught in the fan. Check the Furnace Power. Check the voltage coming from the battery and where it reaches the motor. Purchase York Furnace Blower Motors, Furnace Draft Inducers, Venter Motors on line at discount prices. how to bench check a central A/C blower motor. Check the pressure switch hose for blockages and ensure it is connected properly. This can be annoying, but troubleshooting is easy. If a motor doesn’t have the torque to turn the blower wheel or the fan belt, it won’t start. 6 amps at rated speed and horsepower 370 VAC - 5 to 20 μF 30 inches long #18 AWG 60° C / 140° F Equipped with an automatic thermal overload B 1075 rpm (wiring for three speed). Free shipping and free returns on Prime eligible items. Your furnace and the blower speed is sized and set to match the ducting in the house. Dadan is most likely right, the motor run capacitor is probably open. As a result, you will need to shut off the circuit breaker at the electrical panel that. There are many types, sizes and brands available and it would be worthwhile to get some expert advice before you make your purchase. 0 amps, shaft size is 1/2″ x 5-1/2″, housing is 5″ diameter x 3. The air is taken back to the blower through the return air ducts to the furnace and is then returned to the home through the supply air ducts. During our furnace tune-up, we check to make sure that the flame sensor is clean, and we clean it if we find that’s it’s dirty. and then Google it to try to identify a replacement motor. This article series discusses how to inspect and test a heating or air conditioning indoor air handler blower fan that is not working. Found some diagrams on the net regarding how to test module so that is next. I can see the RPM of the motor but I also think it depends on the size and diameter of the cage portion. Cleaning the motor helps it run efficiently, and that makes it easier for other furnace parts to do their job. Additionally, check the air filters and ductwork integrity before beginning component checks outlined below. The Furnace Makes Loud Noises. Check the motor to see if it is too hot; a unit heating up too much needs to be replaced. One blower functions to cool the motor during its operation and is usually made from plastic and is visible when you open the furnace door. I found that the blower motor wasn't turning. I'm not knowledgable about furnace repair, and I don't want to make things worse. If you want to install a more expensive, high-efficiency filter, check the owner’s manual for the manufacturer recommendations. This would indicate a weak capacitor. If you have a gas furnace, one of the valves may be failing. With so many moving parts inside of the unit, the only way to diagnose the problem is to look at it and check a few things, or get a qualified repairman to do the job instead for a small fee. First, be sure that the capacitor is discharged before using it for safety reasons. You may very easily substitute the blower motor by oneself, it's not as well tough. Plug the 5 pin power connector into the motor even though the plug is keyed, observe the proper orienta-tion. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time. Sometimes, a blower motor resistor might fail due to problems with the blower motor itself. The blower motor on older American cars were not always very well-made, and most of them are bad now. By maintaining proper CFM in cooling, and temperature rise in heating, we get the maximum efficiency out of the furnace and air conditioner. A higher number is better. Cleaning the motor helps it run efficiently, and that makes it easier for other furnace parts to do their job. Englander Combustion Exhaust Fan Blower Motor Direct Replacement PU-076002B; B13400-20 - Goodman OEM Replacement Furnace Blower Motor 1/2 HP; HVAC Blower Motor Resistor AC Blower Control Module for 2010-2017 Ford Expedition 2010-2014 Ford F-150 2011-2017 Lincoln Navigator with Auto Temp Control Replace # BL3Z-19E624-A YH-1829. Keep your home comfortable and energy efficient by tracking the usage of your HVAC system. If your blower wheel is out of balance it will roll and then rock back and forth. Heat and air conditioning can make the difference between a comfortable drive or a brutal one. the unit that has the psc works very good for 15 years the unit that has the ecm motor, I have changed three times in 5 years, so where is the savings?. So, if your furnace has not been working for quite sometime now, check the blower motor for problems. Your furnace’s primary limit circuit is open, probably from loose wiring. • Integrated control module LED display provides E3 erra code. to the home of John Pelletier after smoke was seen coming from a wall near the furnace. Cut the power to your furnace by turning off the circuit breaker at the main electrical panel. Remove the blower and separate the motor. The furnace is a 100,000 Btu Concord 90 Plus model that was installed in 2003. How Furnace Motors Work. The switch is there to prevent operation of the furnace if correct venting air pressures are not detected. So I tested the furnace simply a seized blower motor. Re: 2019 Cyclone 4005 Furnace blower question We have a 2018 Road Warrior, sister unit to the Cyclone, heat in the garage area nope. To lubricate a furnace blower motor, remove the oil caps to expose the bearings and apply just two to three drops of a lightweight machine oil. Your furnace and the blower speed is sized and set to match the ducting in the house. The average cost to repair your Thermostat will range from $108 to $282. If you're Carrier gas furnace is a condensing unit - a high efficiency furnace - it may be that the condensate pump is bad or that the trap in the condensate drain is filled with sediment. First of all the condenser needs to turn on. Check black to white, black to red, and red to white. Dadan is most likely right, the motor run capacitor is probably open. 3) Make sure the blower motor panel is shut. The factory installed blower for the EH models can be replaced with a multi-speed blower allowing the units to accept up to 4 or 5 tons of air conditioning or heat pump. If the furnace fires, the blower should come on within a few minutes. Failing valve. 4) Inspect your air ducts. If the fuse is not blown, then it is possibly a. Most furnaces will have a V shape filter system; the system will take 2 filters. Preparing your furnace for winter is key if you want it to serve you effectively during the cold months. A furnace blower motor is the basic component that powers the flow of air in a furnace. Check the House Vents and Filters. However, this is a job you can do yourself, provided you have the right tools. Turn the furnace off, disconnect it from both the electricity and gas, wait for it to cool completely and then dismantle the blower assembly, and inspect it for problems. No matter what you call it, how much it's going to cost to replace your blower motor depends largely on 2 factors:. Connect the white blower motor lead to the BLW connec-tion within the group of 115-volt Neutral spade connec-tions. 4 Steps To Troubleshoot Furnace Blower Motor Fan And Repair Replacement Guide 1. These procedures are for size 44,000 through 154,000 Btuh input units. Let you know when I get the tester what was the problem. With the blower door in place, closely watch the the burners. If you'd like to save a few bucks on the blower control module, check out the section: Where To Buy The Blower Control Module And Save. Wood Furnace Blowers and Fans When a furnace stops working, there are many parts including blowers that could have gone wrong. The heater blower motor is located behind the glove compartment of your vehicle. With the furnace off (either normally or on a limit shutdown) the dial rotates toward cooler temp. Blower Motor Any forced air system in your home - whether it is powered through electric or gas-generated energy - requires a blower motor. The switch is there to prevent operation of the furnace if correct venting air pressures are not detected. A furnace blower motor is the basic component that powers the flow of air in a furnace. Your total source of Williams Furnace Company replacement parts. The same holds true for the air conditioner blower located in the air handler. Connect the blower motor leads to the new furnace control board. Make sure that the furnace is secured properly and the vent fully terminates to the outside air. The motor has a shaft running through the center of it with the shaft on the left side driving the main furnace blower and the shaft on the right side driving the combustion blower. “Measure the supply voltage to the blower as it’s running to be sure there is adequate power supplied. Also,see what the rated amps are, clip the motor to see if the current draw is normal. This, coupled with the fact that an ECM motor uses less wattage than a PSC motor, you can see why these motors are becoming more and more popular as part of a total energy-efficient system. Your furnace’s primary limit circuit is open, probably from loose wiring. Be sure not to stretch the motor's wires. If it not, you probably have a failed capacitor. The blower motor resistor can be easily tested with a set of simple multimeter resistance tests (especially since it's very accessible). Find the Full Load Amp (FLA) rating of the blower motor. First of all turn off the furnace. Better airflow control has several benefits: Electrical efficiency. I have SF 42 suburban furnace in 2000 Monaco coach. FirstChoice Direct Drive Furnace Blower Motor, 1/2HP, 3 Speed, 115 Volts, 1075 RPM, 10. This is a new substitute for the original 1/5 or 1/8hp motor which is no longer available. Flat mounting. ) If a blower motor breaks down, an HVAC professional can replace it for $400–$600, including parts and labor. If the motor has been overloaded then you need to wait around thirty minutes to an hour and press the reset button. A furnace blower motor that stops pushing warm air out is not the same as a blower that is forcing only cold air into your home. In a previous article about gas furnace maintenance, we discussed the different furnace parts that need to be checked and maintained regularly. Looking for DAYTON 1 HP Direct Drive Blower Motor, Permanent Split Capacitor, 1625 Nameplate RPM, 115 Voltage (3LU89)? Grainger's got your back. Heat and air conditioning can make the difference between a comfortable drive or a brutal one. The ICM is energized with 115 vac whenever power is available at furnace control, but operates only when 24-vac motor control input(s) are ON. A hot blower motor, which indicates an overheating problem, will require replacement. Price $196. If you hear that sound and it doesn’t stop, there’s an electrical difficulty. A fireplace blower helps dramatically increase the efficiency of your fireplace by taking advantage of the heat that would otherwise be lost. The important thing to remember is that your furnace and your AC share the blower motor. Check the Furnace Thermostat Setting. Check drain and trap. If you want to install a more expensive, high-efficiency filter, check the owner’s manual for the manufacturer recommendations. If a house has central air-conditioning, the same blower is usually used to move the cooled air throughout the house. Make sure that the microfarad reading is within 10% of the rated capacitance on the capacitor which will be a number listed either uF or mdf. Knowing how to inspect the blower-fan belt improves furnace efficiency. A variable speed furnace blower motor is a step above a multi-speed blower. Things like leaves, twigs, nuts, pieces of a ripped cabin filter can jam the blade of the blower motor. Hi: I have a furnace blower that I plan to use just as a high powered fan. Or maybe it is just simply not getting any power therefore not turning on. This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. So, there will be times when the furnace blower version will not be able to reach the full 50 Pa depressurization where a commercial door would. Typically it is the fan motor, or associated moving parts. Cleaning the motor helps it run efficiently, and that makes it easier for other furnace parts to do their job. Did your furnace fan stop blowing? If so, it's likely that you've set your set temperature too high, causing your furnace to heat continuously as it tries to reach that temperature. Inspect burners. Your furnace’s primary limit circuit is open, probably from loose wiring. Replacement of the AC fan motor is a simple job requiring only a few tools. The factory installed blower for the EH models can be replaced with a multi-speed blower allowing the units to accept up to 4 or 5 tons of air conditioning or heat pump. The outside Box is fine. 6 amps at rated speed and horsepower 370 VAC - 5 to 20 μF 30 inches long #18 AWG 60° C / 140° F Equipped with an automatic thermal overload B 1075 rpm (wiring for three speed). You might notice many HVAC specialists offer 24-hour emergency furnace repair. Furnaces need monthly maintenance and many do-it-yourselfers overlook the blower-fan belt. If the blower motor hums, check the blower fan to ensure that it spins freely. The furnace internal wiring is complete except for the power supply and the thermostat wires. • Check wiring to motor. A variable speed furnace blower motor is a step above a multi-speed blower. Furnace components and their locations are shown in Figures 1 and 2. I'd wager a furnace blower motor is not. ($625 to fix) Well today they came out to fix it and I just got a call from the company and was told that the bad blower caused the control board to go bad and that they had no way to tell before changing the blower. Other common repairs include ignitors and flame sensors, which fall within this range. I don't see where this furnace can choose it's own speed, based on the provided diagram. First, disconnect fan motor wiring harness connector. No matter what you call it, how much it's going to cost to replace your blower motor depends largely on 2 factors:. Your RV furnace operates on the 12vdc system, You do not have to be plugged in to 120v power use it. From valves, to pilot assemblies, to blower motors, we offer all factory original Williams Furnace parts delivered to your door. Removing the dash may be necessary to access the blower motor on some vehicles. Connect the wires from the blower to the furnace either before or after the blower is bolted back into the furnace, depending on which is easiest. ~First check with the owner of the equipment for their opinion of performance. If the motor is direct-drive these numbers can be difficult to read. An Inducer motor is a small single phase motor located inside the gas furnace of your heating system. Flat mounting. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. I had 220 vlts at the motor (Besides ground) there was a 24vlt common, and there was a wire on terminal3 and terminal4. ~First check with the owner of the equipment for their opinion of performance. The tech who sets this furnace up will measure the temperature rise (heating) and drop across the evaporator (cooling) and. Remove the motor. This relay performs two separate jobs - one to handle the relatively high current needed to run the blower motor - and two, to allow the blower to run for 45 to 90 seconds after the thermostat is satisfied. A start capacitor is typically found on an air conditioning unit or heat pump where extra torque is needed to start the compressor. The PSC motor is energized with 115 vac only when operating. Check that the fan spins freely. 3) Make sure the blower motor panel is shut. The LED on the control module should flash on for one second immediately after the interlock switch is depressed. While you're in there fooling with the. Sorry for the delay, however I wanted to make sure I reviewed the issue and sequence of events with the proper technicians as it seemed a little strange that you would not hear the blower motor start but did hear the electronic ignition?. Furnace blower motor [ 10 Answers ] I have a Climatrol Furnace, and it stopped working. Blocked filters, restrictive ductwork, improper circulator blower speed, a failed circulator blower motor. Check your owner's manual for instructions on accessing the blower, motor, and blower wheel. A Standard Furnace cycles on and off frequently, so that you might typically experience temperature swings of 6 degrees or more in pockets of your home. I had 220 vlts at the motor (Besides ground) there was a 24vlt common, and there was a wire on terminal3 and terminal4. I have two air conditioning units, one unit has ecm motor and the other has psc motor. Troubleshooting RV Furnace Problems in Motorhomes, Travel Trailers and Fifth Wheels If you're a new RVer it may help if you have a good idea of who your RV furnace should work. Symptoms of a Bad or Failing Blower Motor Relay. Check to see if there is excess ducting or bends and kinks in the system if the burner keeps cycling on and off or the blower runs continuously while the thermostat is in the ON position. Another common issue is when the blower begins to blow, but the furnace still isn't igniting. Can you replace a 4 speed furnace motor with a 3 speed? How to set goodman furnace blower speed? Test blower motor hvac. When this process occurs, at times the battery of the RV may run too low to operate the thermostat. Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power source. Also,see what the rated amps are, clip the motor to see if the current draw is normal. 115V, 1050 RPM, 4. You do really need to observe instructions and also have many persistence however. Replacing it is an easy fix. the furnace runs fine for first heat cycle(2-3 minutes) and then will not ignite producing heat to continue cycle. The blower motor resistor can be easily tested with a set of simple multimeter resistance tests (especially since it's very accessible). The pressure switch circuit is open or the induced draft blower is going. How to replace Intertherm M1 Combustion Blower Assembly on an Intertherm M1MB 070A BW Gas Furnace Series #m1D020401209? I think this is the problem. RV Furnace Blower Comes on but Won't Ignite. DANGER, WILL ROBINSON - READ FIRST How to Replace a Trane Blower Motor is a multi-part series article, broken into Part 1 and Part 2. Add balancing weights so that the blower wheel rolls and stops at random positions without rocking back and forth. Never assume the blower motor is bad. Is your furnace blower motor not working and there is no air coming out of your vents? Perhaps your blower motor has burnt out and you need a new one. 4 Steps To Troubleshoot Furnace Blower Motor Fan And Repair Replacement Guide 1. It never achieves any RPM, even if I manually spin it. Have you recently turned your furnace on to discover the motor isn’t working? At B & B Bearing, we can perform a complete overhaul of your furnace’s blower, as well as sell furnace motors. Hi: I have a furnace blower that I plan to use just as a high powered fan. Firefighters were called at 10:02 a. heater power but power is on and board is on so problem must be either with the board or motor. The blower motor is responsible for the process of cycling air from your furnace, to the vents throughout your home. One blower functions to cool the motor during its operation and is usually made from plastic and is visible when you open the furnace door. Battery is disconnected in an attempt to make the low voltage alarm quit beeping, but no luck there. I am assuming that the black wire is hot, and the white wire is common. “Measure the supply voltage to the blower as it’s running to be sure there is adequate power supplied. It is easy to wire a thermostat to your furnace blower with a few tools and a little time. My problem is the blower motor runs continuously. Check that the nozzle is a good fit. A hot blower motor, which indicates an overheating problem, will require replacement. If your furnace's motor runs but the blower doesn't move air, the belt that connects the two probably has broken. Schedule a routine maintenance furnace check once a year. Only 8 left in stock - order soon. If it’s gone bad and can’t hold a charge anymore (to help the normal jumpstart the your blower motor), then it needs to be replaced. First, be sure that the capacitor is discharged before using it for safety reasons. Free shipping and free returns on Prime eligible items. As a result, you will need to shut off the circuit breaker at the electrical panel that. An electric furnace is a device used for providing warmth to the entire building or a portion of it. This chirping grinding sound comes and goes on speed 1 and 2, with no strange sounds at all on speeds 3 and 4. I verified that power is coming to the outside Unit. A capacitor is a device that stores an electrical charge. Failed capacitor would be my guess if no blower. The furnace is now in standby mode waiting for another call for heat. First of all turn off the furnace. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. overheated blower motor the blower motor i talked about was diagnosed by me. Contains direct drive furnace blower motors manufactured by DiversiTech. If the furnace is receiving power, turn up the thermostat, and see whether the blower motor starts within the next few minutes. Heats your indoor environment, using natural gas, oil, propane or electric power. These motors install with all standard 48 frame mounting brackets, use 370V capacitors, are electrically reversible, and have a low power consumption. Heat and air conditioning can make the difference between a comfortable drive or a brutal one. If it is, turn up the thermostat and see if the blower motor starts within a few minutes. You can test your capacitor to see if it's holding charge or simply replace if you have an older furnace. Residential systems run off a single phase electrical system either with one (125V) or two legs (250V). If fuse blows again, check for loose circuits. It still kicked off after about 10 minutes. Make sure the power switch is in the “on” position. Draw beforehand which way the wiring harness was hooked up. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. The blower re-circulates air in your home. How often do I change my furnace filter? A dirty air filter can cause big problems on a furnace heating exchanger and furnace blower motor. Re-install the blower/motor assembly into the furnace. A $1 fiberglass filter will adequately protect the blower and blower motor. The outside Box is fine. A dirty blower motor compromises indoor air quality. Only 8 left in stock - order soon. Order Blower Motor Switch for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 12 thoughts on " ECM 2. In a previous article about gas furnace maintenance, we discussed the different furnace parts that need to be checked and maintained regularly. Add a motor to automatically spin it slowly for a few seconds whenever the blower is energized I would guess its dead/dying, and that you should either replace it or get a furnace tech to check it out (or wait till one posts here). My problem is the blower motor runs continuously. After you perform the thermostat checks and the fan still won’t run, next you will want to take a look at your heat pump/ furnace circuit breakers or fuses. Remove the blower and separate the motor. Hi all, I've got a gas fired, forced air furnace with a programable thermostat. Did your furnace fan stop blowing? If so, it's likely that you've set your set temperature too high, causing your furnace to heat continuously as it tries to reach that temperature. A dirty air filter clogs the air flow and it can overwork the equipment. If you hear that sound and it doesn’t stop, there’s an electrical difficulty. If the motor has been overloaded then you need to wait around thirty minutes to an hour and press the reset button. Can you replace a 4 speed furnace motor with a 3 speed? How to set goodman furnace blower speed? Test blower motor hvac. There are many types, sizes and brands available and it would be worthwhile to get some expert advice before you make your purchase. Connect the blower motor leads to the new furnace control board. ) If a blower motor breaks down, an HVAC professional can replace it for $400–$600, including parts and labor. Turn the furnace off, disconnect it from both the electricity and gas, wait for it to cool completely and then dismantle the blower assembly, and inspect it for problems. How to replace Intertherm M1 Combustion Blower Assembly on an Intertherm M1MB 070A BW Gas Furnace Series #m1D020401209? I think this is the problem. Next, go to your furnace and check on the furnace itself and surrounding walls for another on/off switch or circuit breaker and ensure that it is on as. Central Time!!! Please note the following !!! Weekdays are business days -Monday thru Friday Does not include Saturday, Sunday or holidays. The AO Smith 1/3 HP Blower Motor replaces many furnace and fan coil motors. Re: 2019 Cyclone 4005 Furnace blower question We have a 2018 Road Warrior, sister unit to the Cyclone, heat in the garage area nope. 6 out of 5 stars 10. Your furnace's primary limit circuit is open, probably from loose wiring. I checked to make sure there was 24volts at the other end of the Y wire at the furnace control board while the fan was off and there was. Note: On older vehicles, the blower motor may be located in the engine compartment on the passenger side firewall. If your furnace is making a loud buzzing noise, it may be the result of an off-kilter blower. Symptoms of a Bad or Failing Blower Motor Relay. Blower motor not working is an issue that can be fixed easily with the above tutorial. Another common issue is when the blower begins to blow, but the furnace still isn't igniting. 6 amps at rated speed and horsepower 370 VAC - 5 to 20 μF 30 inches long #18 AWG 60° C / 140° F Equipped with an automatic thermal overload B 1075 rpm (wiring for three speed). Let's take a closer look at some of the specific problems you may be having and what you can do to fix it. 1/5hp 1-speed blower motor. An Inducer motor is a small single phase motor located inside the gas furnace of your heating system. Preparing your furnace for winter is key if you want it to serve you effectively during the cold months. This happens often in many cars. The blower then moves the warmed air into and through the ductwork in your house. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. • Circulator blower runs continuously. Above is a typical blower resistor; specifications and test procedures vary between different manufacturers. First, be sure that the capacitor is discharged before using it for safety reasons. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Look for red flags, such as rust or standing water. Other common repairs include ignitors and flame sensors, which fall within this range. You do ought to observe directions and have a great deal of patience while. Troubleshooting the RV Furnace. The blower motor has begun to intermittently make squealing noises and I suspect the motor bearings are about to fail. If you'd like to save a few bucks on the blower control module, check out the section: Where To Buy The Blower Control Module And Save. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. If you want to buy GE - Genteq Evergreen 1/2 HP 230 Volt Replacement X-13 Furnace Blower Motor Ok you want deals and save. So, if you’ve been told that your blower motor is bad and needs to be replaced, this is technically an AC. If there is, and the blower is not operating, then it's likely either a mechanical failure or an electrical failure, said John Boylan, general manager of Lakeside Service Co. Inducer – Inducer fan – Draft fan – These terms are used interchangeably for the motor and fan that move combustion products through a higher efficiency fur-nace and out a vent or chimney. Connect the blower motor high-heat tap to the blower relay connection marked HI HEAT. RV Furnace Fan Runs But No Heat. If the electrical connection to the motor isnt a simple plug-in, mark down the colors of the wires before removing the old fan motor. combined shipping on multiple purchases. There is a switch on the front of the thermostat to change from auto or manual. The blower then moves the warmed air into and through the ductwork in your house. How do I check the furnace blower motor? To check a furnace blower motor, use a capacitor tester. The blower motor relay is the electrical switch that is used to supply the power for the vehicle's blower motor. If the furnace is completely silent, make sure the furnace has power. The strain causes the motor to draw too much power, causing the short. 4 Steps To Troubleshoot Furnace Blower Motor Fan And Repair Replacement Guide 1. Watching a single phase motor starting you can see that this all happens very quickly. In step 552, the diagnostic test waits for 1 more second, t=96, before taking a reading of the blower motor speed, BLOWER RPM PULSE 461, at step 554. Also check to see if the blower motor is frayed or cracked. The blower resistor is connected in series with the blower fan. On average, a Carrier blower motor replacement costs $150-$500. It is easy to wire a thermostat to your furnace blower with a few tools and a little time. The motor has a shaft running through the center of it with the shaft on the left side driving the main furnace blower and the shaft on the right side driving the combustion blower. Remove any screws directly holding the fan Continue Reading about Cleaning the Blower Assembly of a Furnace. Look at the wiring digram on the back of the furnace.