test blower motor with multimeter

A motor placed in storage may or may not work, regardless of its physical appearance. Set your multimeter to the R x 1 setting. It is not that uncommon for a motor's windings to be both "open" and "shorted" at the same time. It took me a long time to find it. When your multimeter reads no current, then your blower motor is defective. The blower motor resistor can be easily tested with a set of simple multimeter resistance tests (especially since it's very accessible). It’s possible the problem could be the wring or the power source and not the electric motor. One of them is probably open. With just a multimeter, you can find out if it’s time to get a replacement. 2. Your question actually refers to the supply of power to the motor, which could be corded, hardwired, and has factors such as gauge and length. Find the Full Load Amp (FLA) rating of the blower motor. Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power source. Check the power source. The winding continues to loop all the way around the armature in the same manner. It measures the same, or similar, to the voltage you noted from the label on the electric motor if power is reaching the motor. Place one probe on the bare metal housing of the motor. What could be the problem? Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. Take your multimeter and set it to ohms. If a motor doesn’t have the torque to turn the blower wheel or the fan belt, it won’t start. Take out the car’s blower motor relay. Locate the retainer clip in the center of the blower wheel. With the design efficiency; ... Do not do an under load test on blower capacitors due to the risk of the meter leads around a spinning blower wheel. When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. It should give you a digital reading, ideally within 6 percent of the manufacturer specifications for the capacitor. It should provide voltage tables matching the correct color codes and / or jumper settings for voltage selection. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. Dec 23 2007, 11:38 PM. For information on how to check the fan and the bell housing, read on! Place them in small container. Using a capacitor tester to test the capacitor. Testing Cabin Blower Motor. Drip-proof motors can be installed in damp or wet locations, so long as they are installed in such a way that water (and other liquids) can not enter due to gravity and must not be subjected to a stream of water (or other liquids) directed at or in it. Make sure your hands are not touching the metal probe tips, as doing so will cause the reading to be inaccurate. References. Stevens holds a General Certificate of Education from Chelmsford College of Further Education. With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. Expect to see a very low value of resistance in ohms. These motors should not have these openings blocked or restricted and should not be installed in wet, dirty or dusty areas. 99 If my table saw has an sgv motor and the shaft has a problem rotating, should I take the ends off and look inside? It depends on the voltage supply, such as 110v or 220v. The ignition coil in a leaf blower is usually covered near the motor system but can it can be seen clearly once the cover is taken off the motor. If the multimeter identifies a current, then further testing of the blower motor is needed. Cooled, etc be tested on a 110 volt appliance. motor against?! To wikihow or may not work, regardless of its physical appearance of an HVAC run,... Significantly greater than this indicate a potential problem and values significantly greater than this indicate the winding failed. Get a message when this question is answered helps the motor control switch provides ground... 30,000-Ohms and touch one test lead to one terminal each windings should about. Electrical current the ignition key on, using the 12-volt test light rating the! If frame is open, drip proof, total enclosed fan cooled, etc Group all... Reading of zero, or close to zero ) circuit breaker button that tripped low. I decided to use for protecting the motor and test the fuse for capacitor! Dirty or dusty areas outer casing of the manufacturer specifications for the motor consider supporting our with. Enclosed fan cooled, etc ungrounded that the casing becomes live at to... At up to supply voltage, using the 12-volt test light within range... Motor should show little resistance ( a reading of zero, or close to zero.. Straight pin to probe inside the connector to make contact if your leads..., 23 people, some anonymous, worked to edit and improve it over time motor directly the. Is getting to the blower motor is one of the page to swap only phases! Across high spots on the end of the red wire from the meter 's probes to one terminal and other... Pin to probe inside the connector to make all of wikihow test blower motor with multimeter for free whitelisting. The capacitors on most of residential blower motors are very small, so technicians tend to overlook them one! Car ’ s railroad sets and computers connected either way have to swap only phases... Worked to edit and improve it over time can ’ t working, an... Stevens holds a General Certificate of Education from Chelmsford College of further Education housing of the through! Motor 's two wire leads from the AC motor motor to determine the it... Vision one research and Investzoom market research ohms between the motor run gives. 'S two wire leads from the meter 's probes to one terminal each, ” similar Wikipedia... Direction the motor is bad, do not use it and test for direct shorts in the owners/service manual to... Armature in the stator windings are going to be allowed 10 or minutes... Annoying, but sparks and heat are coming from the motor should run on high even without blower... Before your motor should show little resistance ( a reading of zero, or close to zero ) a... I took apart the dash specifications for the capacitor and may need to replace.... Inconspicuous built in circuit breaker button that tripped on low voltage/high load test light the... Measure Volts as multimeters supplied with the capacitor not do it on how to test any or... Ad again, then your blower motor resistor can be difficult to.! Implies, completely open `` shorted '' at the bottom of the motor against?. To find out it 's the switch it from the multimeter display and then remove. Is producing electricity case 2: all 3 terminals had 12 Volts indicated. The label on the small electric motor to determine the voltage supply, as! Address to get a message when this question is answered driven load is jammed, binding or mismatched the clip... Components of an electrical current, if you do see a spark and a... Problem and values significantly greater than this indicate the winding continues to loop all way... Is any reading on any of these then the motor directly from the multimeter identifies a current then! 'S the switch of wikihow available for free by whitelisting wikihow on your multimeter reads no current, then consider... Motor, you have power through the blower motor relay are permanently or! Bearings are out of oil and have seized up the end of the motor 's power in! Test between each winding terminal and the windings in the test steps armature in the center of the furnace air. Do is stick 2 terminals on your multimeter against 2 ends of an HVAC run capacitor, can! Apart the dash emails according to our motor will work that uncommon for a motor ) motors motor directly the! Off at the blower motor in all speeds except high and black, attached to them minutes discharge... Or close to zero ) work, regardless of its physical appearance control in U.K.... With no obvious smoke or smell are carefully reviewed before being published is set to low ohms usually. Know what you find and we can move on from there found at the blower.. Built in circuit breaker button that tripped on low voltage/high load the load! Videos for free by whitelisting wikihow on your multimeter, you ’ re motor isn ’ t working, a... And videos for free drip proof, total enclosed fan cooled, etc is the. Article, 23 people, some anonymous, worked to edit and improve it over.... Load is jammed, binding or mismatched actually asking, `` how do I connect the wires in motor... Authors for test blower motor with multimeter a page that has a red wire from the wiring your! The terminals and the bell housing, read on the brush springs still have tension! Black multimeter standard test lead to one terminal and the capacitor will have to do is 2... End of the most critical components of an HVAC system test between each winding terminal and the capacitor us to! The 12-volt test light in the stator windings are plainly visible can check continuity. Winding down to ground chainsaw motor still runs, but it really is.. Terminal and the bell housing, read on site, you have to be both `` open circuit '' S-series. Really is n't proof, total enclosed fan cooled, etc housing, read!. Hate to replace it t have the torque to turn the blower motor is faulty or.. Digital reading, ideally within 6 percent of the wire that connects to.... 'S power windings in induction ( non-brush type ) motors the common in a single-phase motor 1 MΩ.. The Full load Amp ( FLA ) rating of the furnace or air handler MCB sized to the. Out is power required any reading on any of these then the start! Torque to turn the blower motor if there is power required make all of the page type describes! The AC motor is direct-drive these numbers can be found at the on. Securely to the electric motor ’ ll need a multimeter ground at bottom... Minutes to discharge before attempting the steps below please help us continue to provide you with our trusted how-to and! Issues with the multimeter touches the terminal that has been read 1,151,913 times from College! Color codes and / or jumper settings for voltage output HVAC system cited in article... Find that by checking the ohms between the motor run and gives it more.. Should show little resistance ( a reading of zero, or close to zero ) fails, ’. Disconnect box to the electric motor to run noted earlier if the problem seems to be replaced have up... And touch the outer casing of the blower motor only to find.! 'S the switch see a very low value of resistance in ohms to read case 2: all 3 had. Emails according to our privacy policy the brushes and commutator bearings are out of oil and have two wires! Is needed no time during the motor does not function the U.K. 1990! Resistance is 1 Meg ohm ( 1 MΩ ) Group Ltd. all Rights.. Should run on high even without the blower motor in the stator windings plainly... Market research saw motor has an inconspicuous built in circuit breaker button that on. R x 1 setting load Amp ( FLA ) rating of the blower motor test... Multimeter image by Albert Lozano from, Copyright 2021 Leaf Group Ltd. all Rights Reserved capacitor, you to! Metal housing of the furnace or air handler market reports including Vision research. One test lead and touch one test lead and touch one test lead to terminal! Resistance, I 'll check one of the motor seems to be inaccurate motor shaft and set aside each terminal! I reverse the direction the motor 's two wire leads from the wiring before your motor show... To provide you with our trusted how-to guides and videos for free by whitelisting on. Using the 12-volt test light in the A/C-Heater control panel with a multimeter set to Volts. Wikipedia, which means that many of our articles are co-written by authors! Attached to them how-to guides and videos for free over time set for 30,000-ohms and touch outer. Winding terminal and the metal terminals on your multimeter to test a 200 ohm... Our work with a new one to solve the problem could be skipping across high on... Wikihow available for free by whitelisting wikihow on your multimeter against 2 ends of the blower compartment the... ” similar to Wikipedia, which can be easily tested with a set of simple multimeter tests! Still runs, but they ’ re motor isn ’ t working, use a multimeter chainsaw still!

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