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indoor blower motor troubleshooting

indoor blower motor troubleshooting

On 2019-12-05 - by (mod) - check dip switches or jumpers on fan controller. DO NOT PULL ON THE WIRES. On the off chance that someone has inadvertently mis-connected or shorted fan control wires at the fan limit switch, also check. Other options New and used from $23.36. HVAC Blower Motor Assembly 700236 for Chevy … "brown, & Brown" with. Even a small blower motor can move a large volume of air. Knowing how to troubleshoot and diagnose problems … You can rule out the thermostat by disconnecting the thermostat wires entirely at the heater. The message will be displayed as shown in the figure below. When flame is no longer sensed, the power exhauster will run through post-purge and the blower motor will run through fan off delay time. If you have a variable speed lathe, then you should always try and keep the motor in good condition. This stops compressor and fan motors. Heat Pump Indoor Fan Runs Continuously. _____ _____ _____ 6 Figure One: Problem #2 . enough to let float switch drop, and enable the compressor to run.The compressor would run, cool the coils, and condensate would begin accumulating-- Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off. Cost to Replace Central or Forced Air Blower Motor. If the fan keeps running then it's not a thermostat setting. However it is recommended that the whole blower assembly, with the motor, be removed from the furnace/air handler. Design, CMS, Hosting & Web Development :: ePublishing. Next: If the blower just keeps running no matter what, there are two places to check switch settings before calling your heating or air conditioning service company in response to a furnace fan or air conditioning fan that just keeps running without stopping: 1. Apr 10, Constant Torque indoor blower motor model speed indoor blower motors, constant speed Wiring Diagrams,” found in these guides to. That's motors including the Variable Speed indoor blower motor models 2.0, 2 ... Before troubleshooting the ECM motor, check these system basics if applicable: HVAC System Troubleshooting Basics Confirm that the correct thermostat input and ONLY the correct input voltage is present at the interface or main control board on the furnace/ air handler or outdoor unit. Make sure all the access doors are securely fastened in place. A third possibility is that a motor mount broke, causing the entire motor and blower assembly to drop and the blower wheel is hitting the housing. I climbed back into the attic, removed the panel, and watched the motor start, spin for 5-10 seconds, and stop, repeatedly. indoor blower motor. “Install the motor according to the manufacturer’s instructions, always ensure you have the correct rotation on the blower wheel, and perform post testing to verify proper operation of the motor. “If it’s power-related, a meter reading, under load, will tell you what’s going on. The other place to look of course is at the thermostat. Most fans are energized by a fan relay. She has six years of writing and editing experience, holds a bachelor’s degree in journalism from Oakland University, and is currently working toward her MA in English at Wayne State University. Connect 24 volts from R to pin 12 and pin 15. The blower motor plays an extremely important role in forced-air systems. Technician B states that the meter read "OL" when placing it across the run capacitor. Well, it turned out to be something verrrrrrrrry simple, but somewhat elusive!I checked all wiring from tstat to airhandler, and from airhandler to compressor. and indoor blower motor. 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. in Brighton, Michigan. There are 5 main bad furnace blower motor symptoms to look for: Weak airflow coming from the vents. 1). But even a well-maintained motor might stop working, and then it's time to know how to check for an open or a short. Specialty Motors and Replacing the Blower Motor | Air Conditioning Blower Motor Repair. OEM Replacement HVAC Blower Motor. I am a new homeowner and I found the blower fan (Genteq Endura ECM FM19, 1/2 hp, 230VAC) installed has been running constantly. Tension the belt properly, if there is one.”. It usually means there is a problem related to the indoor unit blower motor. The white knob and white arrow in our photo point to this manual fan switch. A few probable causes include: broken belts or broken drive coupling, blower isn’t … She can be contacted at 248-244-6495 or jenanesi@achrnews.com. 2. There's no whir or hum of the fan motor, no gusts of cold air. intermittent results, I figured the compressor was shutting down for some type of overheat situation.The reality...was different....*facepalm*Contractor came out, gauged compressor and looked at boards on compressor. Perhaps your blower motor has burnt out and you need a new one. It does this by spinning a fan, which blows the air through the ventilation system of your home. My Honeywell digital thermostat is set on cooling currently and the fan is set on auto. Or see FURNACE FAN WONT STOP FAQs - questions & answers about why the furnace blower fan won't stop running. It’s the trigger that circulates conditioned air throughout the home. Click to Show or Hide Citations & References, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. Check the printing on the switch face to see if you should push the switch in or pull it out to leave the blower on "Auto". In the heating season, just set the thermostat(s) to the lowest setting and confirm that room temperature is above that point. Common Problems with Blower Motors Triple check there is the right matched set of pulleys and the proper belt size.”. at FAN WONT STOP - THERMOSTAT SWITCH Other snafus such as a shorted thermostat wire can also cause the A/C or warm air furnace fan to run continuously. SpiroLet's start with the Diagnostics above on this page as that will be a more complete procedure than if I try to make it up again typing in an off-the-cuff reply here. “Most frequently, we install them when we have customers with airflow issues and correcting the ductwork isn’t an option,” Boylan said. Tab Your heating service tech may find a bad switch or control or even a thermostat set wrong or shorted thermostat wires. The capacitors on most of residential blower motors are very small, so technicians tend to overlook them. The blower motor stops working and overheats. The most obvious problem that you can have with your air conditioner blower is when you flip the switch to the air conditioner unit and nothing happens. “A lot of those motors are programmed at the factory for that particular furnace — you just can’t pull one off the truck, stick it in, and say, ‘Here you go.’ It won’t work. 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. Furnace Blower Not Running: he blower motor blows air through the return vent, past the heat exchanger, and into the home’s venting. My furnace fan in my house won't turn off when my unit is off. thank you, I shall ohm out the control wires from thermostate mount plate, and check for shorts. On most equipment there's actually a user operable switch that will turn the fan to run continuously. The other possibility is wiring--if there's some random short or open, responding to equipment vibration or...?How to check the control wiring? These same diagnostics also aid in air conditioning blower assembly diagnosis when an A/C blower continues running. At the room thermostat: the FAN-AUTO-OFF or FAN ON/OFF switch on the room thermostat should be checked. An indoor blower motor will run, but it cycles on an internal overload protector. He mentioned a 5K.I just installed a 100K across G and C. Should only load 24VAC transformer with an additional 24mA.A cooling cycle just completed--system cooled to setpoint, thermostat clicked, and about a minute later, airhandler stopped blowing---good! Service Clinic: Why and How to Test HVAC Blower Motors. A less common cause is insufficient voltage to the blower.”. The blower motor relay is a small but vital component in all HVAC systems. I have a 15 sheer unit that blows strong and then weak, but continues to go up and down when activated at Temp setting. That includes the secondary heat exchanger, the evaporator coil, etc.,” he said. It’s the trigger that circulates conditioned air throughout the home. These same diagnostics also aid in air conditioning blower assembly diagnosis when an A/C blower continues running. Indoor Blower motor defective or cycling on Overload. Whenever possible, motors should be replaced with the same make and model, Kittle said. You can try turning the switch to OFF too.Details of checking the thermostat's FAN-AUTO-OFF or FAN-ON switch position when the furnace (or air conditioning) fan won't stop running are. Indoor blower not working - Answered by a verified HVAC Technician. My blower is staying on all the time. Read the article and discover 5 advancements in Fan Array technologies in 2020. If this situation has occurred to your AC system, try some of the below troubleshooting tips to find out if the problem is related to the air conditioner blower motor or some other part of the system and whether you can correct or repair the problem yourself. Goodman and a tech suggested the thermostat might be defective. “That usually means going back the next day.”, Bay Area Services’ technicians also carry a limited amount of universal-fit motors in their service vans to use as temporary replacements when the need for heat is critical, Beaulieu added. I assume that you are referring to the indoor blower motor that will not come on all the time. These diagnostic steps are for an air handler, blower, or furnace fan that just won't quit running. BillYour service tech might check for a bad control board or ice blocking on the cooling coil. This piece of equipment makes it possible for structures of all sizes to maintain a comfortable indoor climate. Take a look at the fan limit control switch. If the blower previously would run in high speed then I suspect a failed relay or control board. Yellow Flame LED continuous, with no shorts to any other lines.The compressor continued to run intermittently, with no icing seen on coils. Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution. For the SE model I could only find a Blower Motor Resistor, which Motor still does not work. Whats happening can someone tell me what can I do ? When troubleshooting efforts point towards a compromised relay, a simple replacement job quickly brings your systems back online. Apologies for the delay. This article series answers most questions about central heating system troubleshooting, inspection, diagnosis, and repairs. Let me know what you find. “If that is good, then we check the microfarads on the capacitor to see if there’s a short or open on the capacitor. Remove the door on the front of the furnace cabinet to give you access to the blower (it might be on a slide-out drawer.) If a motor doesn’t have the torque to turn the blower wheel or the fan belt, it won’t start. “If it’s less than 5 years old and under a parts warranty, we’ll get an OEM replacement,” he said. Circuit R−G energizes indoor unit blower relay starting indoor blower motor. Therefore, if you have the thermostat set for 70° F and the temperature falls to 68° F then the auxiliary heating kicks in to assist the condenser or refrigeration part of the heat pump system. When a blower motor does fail, Beaulieu said it is often a good time to tell the homeowner to “consider upgrading the equipment.” Sometimes, that means a new system, but it can also mean upgrading to a more efficient, reliable blower motor. That means the bearings are worn and causing excessive drag.”. 3. If the blower motor is not working properly, try troubleshooting the equipment to check for common problems. You mean you think it's the ECM problem (bad or set that way) as well? ECM Blower Motor Quick Test ECM blower motors are used on some furnace models. “The most common cause is dirt accumulation due to lack of maintenance,” said Tom Beaulieu, president of Bay Area Services Inc. in Green Bay, Wisconsin. Problem: What could be causing my indoor coil to freeze up?. See DIAGNOSE & FIX HEATING PROBLEMS-FURNACE - home, A complete list of oil and gas fired furnace controls is, Hello! Turning off the power, I was able to spin the motor with no issues. As your next step you replace the service panels and restore the power supply. ". fan motor and compressor. If you find that your blower motor has become noisy or restricted in the amount of air it is passing through the unit, or no air at all is passing through, then it is time to replace the HVAC blower motor. Please look through those steps and let me know what you find. DIRT AND DEBRIS: Dirt is one of many possible causes of blower motor failure in a residential forced-air system. The Flame LED shall flash rapidly when lockout is due to undesired flame. We describe how to inspect, troubleshoot and repair heating and air conditioning systems to inform home owners, buyers, and home inspectors of common heating system defects. Jump to Latest Follow 1 - 17 of 17 Posts. I mean it blows loud then soft then loud but maintains temp. You plug it into the motor and hit a button, and it tells you if the motor is good or bad.”. InspectAPedia tolerates no conflicts of interest. I'm now getting a 292 error, indicating "Indoor blower motor unable to start (seized bearing, stuck wheel, etc.) what's shutting down the compressor." The blower motor is tucked away indoors, and is employed by both the central air conditioner and the furnace. I've already disconnected the thermostat, and replaced it with a brand new one...along with replacing the blower time delay relay board. HVAC Blower Motor Resistor AC Blower Control Module - Compatible with 2010-2017 Ford Expedition 2010-2014 Ford F-150 2011-2017 Lincoln Navigator Auto Temp Control - Replace # BL3Z-19E624-A YH-1829. A defective indoor blower motor or cycling on its internal overloads will produce inadequate airflow across the evaporator coil. Turning off the power, I was able to spin the motor … 1 D341313P52 3/4 HP 200/300V 6. On 2020-05-23 by Anonymous. Why won't the blower turn on high on my Goodman heat pump and Goodman furnace while in the cooling mode. The blower is typically wired to the thermostat to activate when the fire reaches a certain temperature. By visiting this website, certain cookies have already been set, which you may delete and block. today! It will work for half the day and then the other half of the day it will not shut off.If I flip the breaker off and right back on the fans stays off until the next cycle. My fan keeps running with no heat on furnace. Program # 604253-05. By closing this message or continuing to use our site, you agree to the use of cookies. POSSIBLE CAUSE: Sometimes excessive dust can build up and cause the motor to burn out. This is much easier and less expensive to repair than a motor going bad. 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. First, make sure that power is getting to the motor. Certain system problems will result in the message “CRITICAL MALFUNCTION CALL TECHNICIAN”. This website requires certain cookies to work and uses other cookies to help you have the best experience. It is responsible for controlling the blower motor’s fan speed. The motors operate on 115 volts if installed on furnaces and 230 volts if installed on air handlers. Indoor Blower Motor Stops, Compressor Keeps Running. Blower Won't Work on Central Air. 5. Then, after an appropriate delay, the ignition system functions, and the burners ignite. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. Is "C"/blue the common ground? Unplug the two cable connectors to the motor. 5. fan relay is quite hard to reach, but when I call fan-on, the relay clicks and the fan blows a little bit stronger. If you offer options every time, you’re guaranteed to sell more. Please click here to continue without javascript.. Top 5 Fan Array Technology Advancements in 2020. 3. “Just be sure to teach your service techs about the technology, and give them some collateral to educate homeowners. Dec 06, 2013. I think my air off and the fan off but my furnace keeps lighting up. Fingers crossed that this solved it! Without adequate room temperature air crossing the evaporator coil the refrigerant will get colder and colder till frost starts to form. JamiePerhaps there is a defective fan limit control or fan relay control switch. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. Condenser Fan Motor. industry news and information? If the blower motor is burned out, replace it. “Take the time to clean the furnace thoroughly. You have told the thermostat to turn off the HVAC equipment. VZREP - ECM Motor Repair Kit Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name What wires should be 'shorted' to each other, or to ground, during different operating states? The furnace filter is clogged and raises the temperature within the plenum prematurely, tripping the sensor. Regardless of the manufacturer of the appliance, this guide will help troubleshoot the Genteq ECM motor driving it. - The Flame LED shall flash rapidly when lockout is due to undesired flame . Replacing an aging or malfunctioning blower motor can significantly improve the performance of your HVAC system, reduce your energy costs, and enhance your indoor air quality. It is usually not necessary to remove the motor from the blower assembly. “In very old residential systems — or, more commonly, in commercial systems — there could be a belt-drive blower. These actions have led to significant reductions in emissions from building electricity consumption. Sponsored Content is a special paid section where industry companies provide high quality, objective, non-commercial content around topics of interest to the ACHR News audience. Bad airflow indicates a serious problem. I would think that this is an air handler control board problem, but it could be a thermostat problem. To do this, you must first disconnect the fan motor from the indoor control board but keep everything else connect (especially the display receiver for the remote control signal). Indoor Blower motor defective or cycling on Overload. ("Man" or "Manual" would be forcing the fan to run.). How to know if a furnace blower motor is bad? The contacts inside the relay go bad. Right.The simplest and most straightforward test is to disconnect a thermostat wires at both ends and then working from each end test for any continuity between any pair of them. When the blower fan won't start the problem could be something as simple as a blower compartment door that is not fully closed, or a clogged condensate drain. I suspect the ECM module is programed to run the motor non-stop, by the builder or previous owner? Visit our updated, Samsung HVAC Goes ‘All In’ at Sales Meeting, Tool, Vehicle Tracking Options Protect Company Assets, Thermostat Manufacturers Work to Keep User Data Safe, The NEWS’ Panel Members Pick their Favorite Thermostats, Controls, Best Instructor and Best Trainer contests, Diagnosing and Solving Ventilation Issues, Tips for Testing and Diagnosing Faulty Compressor Motors, Troubleshooting, Preventing Motor Failure, New Motor Products Propel the Market Forward, Motors, Variable Speed Drives and Energy Efficiency. I put in a new control board,that didn't work.put in a new contactor switch.that worked for 8 day's then stopped working.put in another contactor switch .the same. There are two potential parts that may be faulty: the indoor control board and the fan motor. Why won't the blower turn on high on my Goodman heat pump and Goodman furnace while in the cooling mode. The fan control should be set to AUTO. They will adjust their RPM in an attempt to deliver the CFM that is programmed by the installing technician. fan motor still runs constantly. I assume that you are referring to the indoor blower motor that will not come on all the time. A hot blower motor, which indicates an overheating problem, will require replacement. It’s an easy way to raise average invoices and customer satisfaction.”. Contact your local rep. Watch out: In any event if you have the slightest worry that the heater is unsafe then. Get it as soon as Thu, Dec 3. “OEM direct replacements are stocked on our trucks,” he said. We explain what switches or controls may be set improperly or what else, such as a shorted wire, can cause continuous HVAC fan operation. These double shafted motors are rare in residential units, but they do exist. Jen Anesi is Legislation Editor. Hi Jason! If there is a leak and you are unable to defrost the coil, contact your local Trane Comfort Specialist™. Finding the location of the fan assembly is a good place to start diagnosis. We discuss this switch right here. Thank you for getting back to me. Don’t guess the blower size, and be sure to verify performance after installation.”, Beaulieu said he’ll replace the motor with an OEM motor depending on the age of the furnace. In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing. All lines were Sometimes my blower fan won’t shut off for a while. I agree with you that typically there's either a switch set somewhere or a shorted wire or bad control. Keeping motors clean is an important step. “We also offer them when we perform energy audits and the equipment is less than 10 years old with a PSC fan.”. I had a new-in-box thermostat on hand, and wired it in. Replacing it is an easy fix. Brown wires. 2. J ... EDIT - I have the manual for this heat pump and I'm running through the troubleshooting section for "blower motor doesn't run". We have no relationship with advertisers, products, or services discussed at this website. “Then, you plug it back in. The inducer blower assembly consists of a small motor powered by electricity, a fan, an electrical box to allow connections, and a … You will see a motor sitting on top or next to a larger blower wheel connected by a fan belt. The blower motor resistor assembly is a common malfunction on them. FREE Shipping by Amazon. Belt Drive Blower Motor Fan Problems. He then “We check for mechanical failure by testing if the bearings are good and if the wheel spins freely; then, we check for electrical failure by first verifying that the circuit board is applying the correct voltage to the blower,” he said. Hi Jason! at THERMOSTAT WON'T TURN OFF. If the blower previously would run in high speed then I suspect a failed relay or control board. However, they were commonly called “variable-speed” motors and may have been listed in various literature as EFMs (electronic frequency modules) or simply dc motors. Troubleshooting these is much more complex, but on pages 10.11, and 12 of this manual it walk you through some things to check. Make sure the belt is not damaged and check its alignment. First let's identify the exact brand and model of heater and then look at the manual to see what settings are available. Assumption: the W, Y and G should have no continuity If the equipment was running give it three to four minutes to shut down. On the chance that there is a shorted thermostat wire, a problem that can also cause the A/C or warm air furnace fan to run continuously, Details about the manual FAN ON or FAN AUTO ON switch right at the furnace or air handler at the manual. at BLOWER FAN CONTINUOUS OPERATION) to leave the blower fan on continuously for long periods, such as to use an air filtering system to improve indoor air quality. Weak airflow can be an indicator of other problems too such as used up air filters but problems with the motor are a likely cause too. Step for in heat pump troubleshooting is to check the airflow. anything. This does not seem to happen at other times of day. The inside temp is already at set point and drops to a couple degrees below the set point within a few minutes of the fan coming on and stays there the whole time the fan is running. I checked voltage on the 4-pin power supply to the ECM, they are all correct (C-0V, L-115V, G-0V, N-115V). First, turn off all power to the unit and turn off the gas at the gas valve that serves the furnace. I hope you simply shut down the system then called for repair; It's using the indoor furnace fan to blow cool air through the same duct system used for warm air heating. 65-second efficiency delay).Figured it was the blower delay relay board; replaced it and all seemed ok for a few days. “Measure the supply voltage to the blower as it’s running to be sure there is adequate power supplied. The first step in diagnosing blower motor failure is to check to see if there is demand for the blower. If it is too hot to touch, then the blower motor is overheating and it is time to replace it. Forced air heating or cooling air handler troubleshooting: blower fan won't shut off: This article describes what to check if the furnace or forced air blower fan does not stop when you expect it to do so. Blowers in older furnaces generally employ single-speed permanent split capacitor (PSC) motors while many newer furnaces use variable-speed electronically commutated motors (ECMs). What do I need to do, if I don't want the fan constant blowing? I have a Payne all in 1 blower condenser unit. Replacing A HVAC Blower Motor. 24-volts is not present at the IFR coil. Restricted air flow can also cause an air conditioner or heat pump coil to freeze. This is what I have gathered so far: 1. if I disconnect 5-pin low voltage signaling on the ECM, the fan still runs. Reducing HVAC GHG Emissions: Electrification & Decarbonization. see FAN LIMIT SWITCH. Air Conditioner Blower Motor Won’t Turn On . If you want to troubleshoot yourself, I recommend going through these checks. Blower motors are a common component in a home, commercial, and automotive HVAC systems. Continue reading at FAN WONT STOP - THERMOSTAT SWITCH, or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. Visit our updated, This website requires certain cookies to work and uses other cookies to help you have the best experience. If you don't know where to find the limit control switch on your furnace or air handler. He conjectured about putting a pull-down resistor across G and C, to bleed any stray/leftover voltage at setpoint shutdown. As explained in the HVAC Blower Motor Guide, an air conditioner blower motor and assembly is basically the fan inside the air conditioning system that forces the cooled air, via the AC cooling coil, through the vents and into the room space that is being conditioned.This makes the air conditioner blower motor assembly one of the most important parts of your air conditioning system. trouble started, and wonder if the transformer might have been zapped, and isn't putting out 24 VDC. Carrier HD42AE232 Air Conditioner Blower Motor Replacement. So the capacitor plays a big role. Before we focus on the motor and controls of the air handler blower fan (used in both air conditioning and heating systems) let's ask if the trouble is not specifically the blower fan but more basically: the air conditioner or heater itself just won't start in response to a call for cooling or heating. High−speed lead is black, low−speed lead is red, and common lead is yellow. Have you tried disconnecting the thermostat right at the air handler? There are a couple of tools out there [for testing motors], like the TECMate [from Genteq]. until it began to back up in the slow drain, and lift the float switch--and shut down the I climbed back into the attic, removed the panel, and watched the motor start, spin for 5-10 seconds, and stop, repeatedly. Knowing how to troubleshoot and diagnose problems with these motors is an essential skill an HVAC technician must possess. Fan Array is an air handling unit composed of multiple small, lightweight, affordable, and extremely energy-efficient fans. How to Replace a Blower Motor Relay. Also, check for signs of water leakage below the indoor unit. A critical malfunction is a system problem that will result in no system operation, and must be addressed immediately. Is your furnace blower motor not working and there is no air coming out of your vents? Over the past decade, buildings have become more energy-efficient, heat pump performance has improved and the electric grid has become greener. A blower motor takes the heated or cooled air created within the furnace and circulates it throughout the home in order to ensure the temperature reaches what’s called for on the thermostat. 4. heat sequencer checked (I have a heat pump and electric heat). In any of these cases, it is time to call an HVAC repair service. The PHX3 unit is a fully self--contained, electric heat pump unit designed for .. What can I do? A defective indoor blower motor or cycling on its internal overloads will produce inadequate airflow across the evaporator coil. AHU blower fan troubleshooting diagnosis & repair: This article series describes in detail the testing and diagnosis of problems with air conditioning fans and with forced warm air heating blower fans found in the air handler or AHU. When the motor is working well, you should simply be able to turn it on, and it will power up straight away. Interested in participating in our Sponsored Content section? Fan motors are the unsung “heart” of HVAC equipment. Photo courtesy of Thornton & Grooms. On 2020-07-15 by Steve (in GA) GE - ECM Motor Technology and Troubleshooting The ECM Service Guide provided by Genteq is a troubleshooting tool like no other. 4.4 out of 5 stars 283. If your blower motor is showing any of the aforementioned signs, consider contacting The Cooling Company to arrange an inspection or replacement. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Anything from no air circulation to annoying or noisy operation. (Follow the manufacturer’s procedures). Don’t just replace [the motor] and run — check things over thoroughly. It's doing same thing--seemingly random failure of airhandler to shut down, after reaching set-point temp.I'm wondering about either the control wiring, or the 24 volt transformer. Phil Rizzo. The vent temps were These double shafted motors are rare in residential units, but they do exist. The motor has two plugs (fig. In any case, the system should be shut off as soon as possible when this sound is heard or the repair bill could significantly increase. If your unit is equipped with a double shafted motor expect to pay up to $300.00 or more for a new motor. I can't tell what's happening with your furnace from your brief text: is the thermostat calling for heat? to C (ground), or to each other--correct?I found a discussion in another forum with same symptoms (intermittent failure of airhandler to stop blowing after reaching setpoint temp), where poster found the G line was left 'floating' (as opposed to being grounded) at setpoint shutdown. I did actually peek in the float switch cup several times, and never saw Carrier 99MR1527BA363203 Motor,Blower (50 Hp Odp High E: View Carrier Part # 99MR1527BA363203: B01891-01: Carrier B01891-01 Blower Motor Assembly 3/4 Dd: View Carrier Part # B01891-01: B01891-04 : Carrier B01891-04 Blower Motor Assembly 3/4 Dd: View Carrier Part # B01891-04: B03321-01: Carrier B03321-01 Blower Assy. She might check the diagnostics above on this page first. A.O. When the home’s thermostat detects that the living space is warmer than its programmed temperature level, a cooling cycle begins.

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