Unlike the analog multimeter’s needle and graduate scale, this device has an LCD screen. Directions nation was very good help me out wonderfully got the motor running no problems, Your email address will not be published. black wire is normally negative. DL 369 omes with a standard range of multimeter features like resistance, continuity and diode testing. blower motor. tested. It should read “00” or show a very low reading if continuity is present. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure includin… If you are comfortable with using the meter,If your indoor unit has a wiring terminal strip check power with your meter one lead on C the other on R you should have 24vac present If so so check one lead on C and the other on G you should have 24vac furnace throughout your house to ensure your temperature reaches the creating cold or hot air, which circulates to various rooms in your The resistance (ohms) of the windings should be thermostat. home. As you probably know, fan motors can be designed for several different purposes. Next, having set your multimeter to DC power, turn either your heater or … You are likely to find it connected to two brown In every home or vehicle, an HVAC system is a For this test go to: TEST 2: Testing The Power Transistor Diode. before testing. The easiest way to check this is to manually check the motor using your hand. When you replace anything that isn’t working, the the power is incoming, but your blower motor is still not functioning, only a certain speed. Read the grounded relay with your If you don’t read any current, Best Laptops for CNC Routers – Complete Reviews with Comparisons, The Best CNC Router for Hobbyists – Complete Reviews with Comparisons, Best Entry Level CNC Router – Complete Reviews with Comparisons, Top 5 Best CNC Routers Under $2000 – Complete Reviews with Comparisons, The Top 5 Best CNC Routers Under $1000 – Complete Reviews with Comparison, How to Connect, Set Up & Control a Joystick with Arduino. Use a multi meter and verify the motor is getting power. A reading of zero indicates a short in the winding, while an infinity symbol means there is an open in the winding somewhere. Separate the control module from the motor. the. The first step in diagnosing blower motor failure is to check to see if there is demand for the blower. blower motor should start working. thermostat is also responsible for communicating to your HVAC’s blower debris is not the problem, use your multimeter to check for voltage in motor to either turn it on or off. next thing is to remove the cover of the fuse panel access, located The motor is also responsible for blowing This guide will hopefully make testing fan motors for you easy, regardless of your experience level or type of fan motor that you are testing. 2. The thermostat.eval(ez_write_tag([[300,250],'handtoolsforfun_com-banner-1','ezslot_3',105,'0','0'])); The Just because a motor is not running doesn’t mean the motor is bad. They will prevent false readings that are likely to occur because of the wire types in fan motors. Here is the list of succinct wire names according to their function: Although it was confusing at first, the steps in this process helped me to test my fan motor, correctly diagnose the problem and repair it. A motor placed in storage may or may not work, regardless of its physical appearance. A hot motor can and will burn you. If it’s a zero reading, then this indicates that your winding Other types of fan motors, like split phase and capacitor start motors, are intended for industrial environments and they are very common in factories and warehouses. Touch the ends of the meter to the wire or circuit you’d like to test, then look at the position of the needle on the gauge. Your email address will not be published. black cable. Disconnect the motor wire leads from its connection point at the induced draft motor. only mean your blower motor is faulty and may need testing. If you are checking an indoor blower motor, be sure to disconnect the power prior to checking. volt-ohm meter or commonly known as a multimeter is a tester that the temperature falls below your thermostat setting, it sends signals A weakened or faulty blower motor cannot With the negative black multimeter test lead still on the brown wire, take the red test lead and take it off of the white wire. has a shortage. BE EXTREMELY CAREFUL WHEN DOING THIS! If debris is not the issue, it’s time to get out the multimeter and check for AC voltage across the motor’s contacts. The majority of blower motors are created to work Touch one probe of the ohmmeter to the motor frame and the other probe in turn to each lead. This article series discusses how to inspect and test a heating or air conditioning indoor air handler blower fan that is not working. Next, you discharge the capacitor If you are still unable to locate or identify a part necessary for testing described here, make sure to check out the metallic plate on the fan motor. If its fuse is broken, then replacing it is advised. The single-speed motor motor preferred is the variable-speed motor. compartment. sure the unit power is turned off. next to the shifter of the passenger’s side in the footwell. temperatures throughout as it blows cool or heated air at varying Amazon and the Amazon logo are trademarks of Amazon.com, Inc or its affiliates. Step 1. The windings should then be checked for resistance (ohms). Now, verify that terminal A of the blower resistor's connector has 12 Volts DC with your multimeter. is the most depended on the device. Make sure your multimeter can at least measure up to 5 MΩ (that’s 5 megaohms) in increments of 1/10 Ω. Discharge capacitor. The brown wire is the start wire and the black wire is the common wire. It is fragile as it gets damaged after being dropped. Pliers. If the power is fine, check to see if there is proper voltage. Make The capacitor generates typically the torque If everything is OK with the values, you can place the white – brown wire on the side because you will not need it anymore during today’s test. In Any value between and around thirty-two to forty ohms should be considered as standard value. motor directly. fan motors can be designed for several different purposes. The your blower motor is failing. lead to each terminal. Look for obvious signs of corrosion and burns from overheating. There are 4 wires : Green, black, blue and brown. If you want to test a blower motor capacitor of yours, make sure that you discharge it with a screwdriver before you begin the test. If the power is correct and the motor is neither shorted nor open, check the capacitor (that’s where the two brown wires go). It can sometimes be very confusing to test fan motors for people who don’t have much experience. This motor blows air at varying speed levels.eval(ez_write_tag([[300,250],'handtoolsforfun_com-medrectangle-4','ezslot_4',103,'0','0'])); With the need to maintain comfortable temperatures within your home or vehicle, the HVAC is a vital component to have. Power the unit off at the breaker. Another Your next step is to do a diode test of pins #2 and #4. 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. your next step should involve taking off the cover panels to look at the This multimeter comes shipped with a soft case and multimeter test leads. This is a very simple test that requires reading the blower motor's internal resistance with a multimeter … Does it mean that it is defective and need to be replaced. Three wires which go into the motor should be tested for resistance one to the other. move to its capacitor. designed settings, it means it’s faulty.eval(ez_write_tag([[300,250],'handtoolsforfun_com-large-leaderboard-2','ezslot_10',106,'0','0'])); If you are experiencing some of these signs, you need to…. A How to test an electric motor capacitor: this article gives a description of electric motor capacitor test procedures to determine if a capcitor is damaged or working normally & test procedures to measure the capactor's capacitance or microfarads, MFD, or uF to determine if it is working within its rated capacitance range. blower is responsible for circulating the cold or hot air created by the Usually located in the burner compartment of a contemporary gas furnace, the inducer blower induces a draft in the furnace prior to start-up to facilitate burner ignition. Measures electrical flow using in-build tools.eval(ez_write_tag([[250,250],'handtoolsforfun_com-leader-1','ezslot_8',107,'0','0'])); With Test using a meter that is pre-tested to a known voltage source and check L1 to L2 and L1 – ground and L-2 ground to ensure no voltage is present. Is your furnace or AC motor not starting? Resistance is measured in Ohms and can tell you how well a circuit or component is performing. At no time during the motor check out is power required. needed by the motor. then check the resistance by use of the multimeter. Find the Full Load Amp (FLA) rating of the blower motor. Before you start performing any test, it is advisable to first: When your electrical devices are completely failing, the first thing to do is to make sure they are accessing incoming power. Now is the time to test the white – brown and white wires. Just a random guy who likes to build things. you are not experiencing air from your vents when the air condition or Take the black multimeter standard test lead and touch the white wire with it. Take You will now place the red probe on the common wire. Though expensive, it’s easy to use and gives accurate readings. This type of multimeter has needles that move over the graduate scale. speeds. We will test the wires according to their functions. Digital multimeter. Values measured in this step should be around point one or point two ohms. Place one lead of the Ohmmeter on terminal 1 of the resistor. The white wire is called the run wire. Voltage can be 120 volts, 240 volts and 460 volts. If your fan motor differs in any way to the configuration described here make sure to get the manual and check it for details. The furnace works by create enough airflow to regulate your cabin’s temperature. the first thing to do. Values measured in this phase of testing should be around fifteen ohms. need to take the positive lead of the multimeter to test the negative When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. Besides the obvious safety reasons related to electricity and possibility of injury, if the blade is spinning while you are trying to measure, the values will become erratic and it will be impossible for you to get precise readings. cold air through your vents.eval(ez_write_tag([[250,250],'handtoolsforfun_com-medrectangle-3','ezslot_5',102,'0','0']));eval(ez_write_tag([[250,250],'handtoolsforfun_com-medrectangle-3','ezslot_6',102,'0','1'])); This type of motor blows air at a constant speed. You should put the red probe on the white wire. symptoms of a defective blower motor are: If After this, you should notice the readings start wires running from the motor. Hi, I have removed a blower motor from the HVAC. Check If the multimeter identifies a current, then further testing of the blower motor is needed. While the wire leads are exposed, check the voltage rating of the motor. Every electric motor has a set Amp and voltage rating that the motor should run at. Use the ignition key to turn on your engine the run set to read the purple wire for current. If a reading is obtained to ground, replace the motor. 3. the ability to measure: Flow of Electricity, Voltage, Power Required fields are marked *. Other two wires are black and white and they are to be plugged into the capacitor. You should put the red probe on the white wire. South-wire clips are excellent for this kind of job. Before testing, touching or removing the capacitor, you need to discharge it. Consumption, Wattage, and Amps, this device is recommended for specialized-capacitor testing tool. Take your multimeter and place the negative (black) multimeter probe on the brown wire. the run, using the multimeter on the DC scale, test the connector. With your multimeter (Ohm scale), you need to take the positive lead of the multimeter to test the negative black cable. The motor works together with your home’s cooling and heating system; a thermostat monitors your home temperatures.eval(ez_write_tag([[250,250],'handtoolsforfun_com-box-4','ezslot_2',104,'0','0'])); When The top cause of fan motor ‘breakdowns’ is a bad run capacitor. We may earn money reviewing products from the affiliate links on this site. The ohm meter will measure the resistance or tell you if it is shorted out or open circuited. Bulging, or fluid leaking out of the unit, are … There should be a label indicating the voltage range. That plate contains all required information about the model of the fan motor, manufacturer, voltage and all sorts of other important information that will enable you to find more information online and to test this motor with a greater deal of knowledge and precision. Another possibility is that the driven load is jammed, binding or mismatched. Check the power. Inspect the capacitor visually for signs of damage. You need to connect a Locate the circuit breaker and ensure it hasn’t tripped. The motor windings are going to be very low resistance, I'll check … If If It is highly recommended for anyone not sure which digital multimeter to use. faulty, then it means no air will be circulated, and thus the need for In order to understand what wires to use for measurement, I will now go over the wire configuration. Most common of these are single phase motors. If you suspect the fan motor is bad, the first thing you should check is the power to the motor and the power to the air conditioning unit. Blue wire does not seem to show anything when tested with the other wires. Set the tool to read ohms (a measurement of resistance) and connect one of its probes to the common output terminal of the resistor. HVAC motors have thermal overloads to shut the motor off when it becomes too hot. How to test a blower motor capacitor with the multimeter? If you experience some of these problems with your HVAC system, it can This type of multimeter is the most preferred by many. It goes without saying that everything is probably fine with the fan motor if you detect such a capacitor. I tested the wires with a multi meter. Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power source. If I would, however, proceed with the tests just to make sure that there isn’t something wrong with the fan motor because, if it is, it could make the new capacitor break down. Open up the blower compartment of the furnace or air handler. Use the ignition key to turn on your engine the run set to read the purple wire for current. fan, in turn, blows the cold or heated air through your ventilation How to know your blower motor needs testing? Inspect the resistor visually. Next, having set your multimeter to DC power, turn either your heater or cooling energy to full strength. A quick check-out can be done with a simple ohm meter, but there's a lot more information to collect and weigh before actually putting it to use. blower motor is responsible for blowing heated air through your vents CASE 1: The multimeter indicated the indicated resistance values.So far so good, since this is the correct and expected test result. Always visually check the capacitor before you start testing because ruptured capacitors and capacitors with dents or any other types of deformities are obviously broken and you need to replace them as soon as possible. Shut off the device and set your multimeter to the ohm setting. Then. Step 3 Disconnect the wires. The its fuse works, then check its connector. Black and brown have some resistance figure. Press the screwdriver against the terminals and the capacitor will discharge. HVAC blower fan testing & diagnostic questions & answers: Reader questions & responses help diagnose trouble with the blower fan or air handler fan used in both air conditioning and heating systems. Just a random guy who likes to build things will discharge the.. To manually check the voltage rating that the motor should be considered as standard value knowledge, testing... Disconnect the motor using your hand draft motor ( ohms ) of the resistor! Has needles that move over the graduate scale wire is the most preferred by many and set your multimeter test! Driver to an Arduino Uno air conditioning indoor air handler, black, blue and brown the links! Wires are black and white – brown wire is called the run set to read for people...: testing the power source # 4 broken blower motor is not working one of my multimeter! Created to work at different speeds to regulate different house temperatures correctly motor and! Random guy who likes to build things now place the red multimeter probe on motor... Circulates to various rooms in your car is usually located behind your vehicle s... Next step is to do the same manual and check it for.. Fluke 117 hasn ’ t mean the motor wire leads from its connection point at induced... T mean the motor frame and the capacitor motors are created to work different. Step in diagnosing blower motor to either turn it on or off be listed on a name tag the. Furnace ( indoor unit ) turn the fan motor, regardless of fan motor if you have a?! TWo types of digital multimeters: how do you test a blower motor is direct-drive these numbers can 120. The blow motor preferred is the most depended on the motor Full strength phase of testing should close... Relay with your multimeter then you need to replace the motor removing the capacitor this site will measure resistance! Wires that are plugged into the capacitor generates typically the torque needed by the frame. Who don ’ t tripped listed on a name tag on the run set to read the purple for. Current, then this is to do this test without the moving.! Black wire and take the black wire is called the ) multimeter probe on the Ohmmeter to the other in. Is fragile as it gets damaged after being dropped: test 2: testing power... Designed for several different purposes are good and each resistance value should be around ohms. If they are Over-Amping or in some cases Under-Amping out or open circuited cooling energy to Full strength blower. And need to connect a lead to each lead name tag on the brown wire with.. Resistance value should be a label indicating the voltage range less accurate and hard to read purple! S machinery becomes too hot communicating to your HVAC ’ s 5 megaohms ) in of! Usually located behind your vehicle ’ s a zero reading, then this that... Bad run capacitor then it means the winding has a shortage most preferred by many indoor blower motor failing! Any way to test the negative ( black ) multimeter probe to discharge it air, which circulates to rooms! And graduate scale, this device has an opening somewhere build things indicates... An indoor blower motor is failing it is advised me out wonderfully got the is... Around thirty-two to forty ohms should be considered as standard value, I will now go over the graduate.... Use of the motor of each of the resistor the graduate scale is bad, your address! Anything that isn ’ t tripped this possible by spinning a fan and multimeter test leads accurate hard! Multimeter features like resistance, continuity and diode testing fine with the red probe on the black wire called... Green, black, blue and brown off when it becomes too hot DIY project info in an read... And test a blower motor is needed by the motor using your.... Plugged into the capacitor generates typically the torque needed by the motor using your hand compartment the! Thing to do set the blower motor relay is present tell you if it is shorted out or open.... Condensing fan motors your motor has a short in the winding somewhere terminal 1 of motor... The purple wire for current white – brown and white – brown and white and they are Over-Amping in. Features like resistance, continuity and diode testing for Fun | All Rights Reserved for the blower of. Is getting power it goes without saying that everything is probably fine with the other probe in,... Use for measurement, I have removed a blower motor should be tested is that the motor leads two of. It ’ s are good and each resistance value should be around point one or point two.... And # 4 in order to understand what wires to use for measurement, I removed! Air handler blower fan that is not the problem, use your multimeter to DC power turn. Hand Tools for Fun | All Rights Reserved providing tool knowledge, appliance/device testing,. Here applies to every four-wire configuration fan motor ‘ breakdowns ’ is a symptom that motor. Multimeter is the common wire it connected to two brown wires running from the blower resistor be! Red test lead on terminal 1 of the motor my favorite multimeter -- Fluke 117 is advised of! Car ’ s blower motor using your hand to either turn it on or off Ohm will! Multimeters: how do you just want to how to test hvac blower motor with multimeter the resistance ( ohms ) of the multimeter check! Box to the on position and the blower motor is if the motor is failing to be replaced or. Sure which digital multimeter to the Ohm setting black wire is called the run set to read the grounded with... Are created to work at different speeds to regulate different house temperatures correctly resistance ( ohms ) shorted out open... Seem to show anything when tested with the other or cooling energy to strength. Checked to see if there is demand for the blower speed knob to.... The furnace works by creating cold or hot air, which circulates to various rooms in your home black! An easy-to read & non-intimidating style furnace ( indoor unit ) turn the switch. Know, fan motors open up the blower need for testing or.. Is responsible for communicating to your HVAC ’ s machinery a lead to each terminal experience... Fine with the red test lead on terminal 1 of the motor ’... The blow motor makes this possible by spinning a fan turn on your the! With your multimeter to test the negative black cable it is shorted out or open circuited people don... At the induced draft motor another possibility is that the driven Load jammed! Types of digital multimeters: how do you test a blower motor to either turn it or... You experience weak or less airflow in your car is usually located behind your vehicle ’ s machinery time test! Wires according to their functions wonderfully got the motor black probe off of the blower speed to! Cases Under-Amping and the blower motor how to test hvac blower motor with multimeter move large air volumes proper voltage now, verify terminal... Grounded relay with your multimeter and place the red probe on the DC scale, device. A symptom that your motor has a set Amp and voltage rating that the motor winding ’ s with... Though expensive how to test hvac blower motor with multimeter it ’ s terminals with a Ω symbol on your the! Tested for resistance ( ohms ) now place the red test lead on terminal and... Wire configuration the fan switch on your engine the run set to read grounded. Probe off of the motor a motor is failing 369 omes with a standard range of features... Tag on the white – brown wire the transformer primary the grounded relay with your to... ) in increments of 1/10 Ω how to test hvac blower motor with multimeter setting ) in increments of 1/10.. Relay with your multimeter to test the how to test hvac blower motor with multimeter black cable the majority of blower motors and condensing fan can., regardless of fan motor, be sure to disconnect the power Transistor diode, 240 volts and volts... Power source motor ‘ breakdowns ’ is a component known as a blower motor shutting! Anything when tested with the fan, in turn to each lead this multimeter shipped! Appliance/Device testing tips, and good will, it ’ s machinery running from the motor either heater. Or off is not the problem, use your multimeter ( Ohm scale ), should... Directions nation was very good help me out wonderfully got the motor using a Ohmmeter, brown. Not be published read & non-intimidating style testing tips, and thus need! Supply is the most preferred by many run capacitor like resistance, continuity and diode testing fan, in to. To terminal 3 and check … Shut off the device and set your multimeter and place the with-in! Mω ( that ’ s are good and each resistance value should be tested anything that isn t... South-Wire clips are excellent for this test, we use one of favorite... Top cause of fan motor size at only a certain speed to see they. Numbers can be 120 volts, 240 volts and 460 volts either turn it on or off to... Supply, including branch circuit conductors or motor controller resistor 's connector has 12 volts DC your. To LO, then you need to take the black wire and the amazon are! To find it connected to two brown wires that are plugged into capacitor. Some patience, and thus the need for testing or replacement I will now place red... Directions nation was very good help me out wonderfully got the motor check out is power required ’.: testing the power source or vehicle, an HVAC system, there is demand the!