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Motor or Compressor Won’t Run Capacitor Test, Troubleshooting

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Language: en

00:00:00.360
a capacitor is a component that stores
00:00:10.070 00:00:10.080 an electrical charge and then releases
00:00:12.530 00:00:12.540 it capacitors are most often used to
00:00:15.650 00:00:15.660 help start and run motors and
00:00:17.150 00:00:17.160 compressors and can be found in central
00:00:19.670 00:00:19.680 air conditioners furnaces and other
00:00:22.160 00:00:22.170 heating and cooling applications as well
00:00:24.800 00:00:24.810 as in appliances such as refrigerators
00:00:26.870 00:00:26.880 and washing machines if the motor or
00:00:30.919 00:00:30.929 compressor does not start or start
00:00:33.200 00:00:33.210 slowly the capacitor may be defective
00:00:36.160 00:00:36.170 when a capacitor fails it will often
00:00:39.050 00:00:39.060 bulge or a leak if you observe any
00:00:41.990 00:00:42.000 bulging or leaking the capacitor must be
00:00:44.420 00:00:44.430 replaced if there are no visible signs
00:00:47.690 00:00:47.700 of damage the capacitor can be tested to
00:00:50.270 00:00:50.280 determine if it's working properly in
00:00:52.330 00:00:52.340 this video we will show two testing
00:00:55.340 00:00:55.350 methods the first test will help
00:00:57.710 00:00:57.720 determine if the capacitor is capable of
00:00:59.900 00:00:59.910 storing and then releasing its
00:01:01.520 00:01:01.530 electrical charge and can be performed
00:01:03.710 00:01:03.720 using an analogue style ohmmeter before
00:01:08.510 00:01:08.520 handling the capacitor you should
00:01:10.370 00:01:10.380 release the potentially stored
00:01:11.750 00:01:11.760 electrical charge to avoid injury you
00:01:14.840 00:01:14.850 can do this by placing a screwdriver
00:01:16.520 00:01:16.530 with an insulated handle across each set
00:01:19.100 00:01:19.110 of terminals be very careful not to
00:01:21.500 00:01:21.510 touch the screwdriver blade now rotate
00:01:25.850 00:01:25.860 the range selection dial on the meter to
00:01:28.040 00:01:28.050 a setting of 1000 ohms or higher if
00:01:31.570 00:01:31.580 necessary calibrate the meter by
00:01:34.100 00:01:34.110 pinching the probes together while
00:01:36.050 00:01:36.060 adjusting the needle to read zero
00:01:39.490 00:01:39.500 to test a single capacitor use a probe
00:01:42.820 00:01:42.830 to touch one of the terminals and the
00:01:44.410 00:01:44.420 second probe to touch the other terminal
00:01:46.500 00:01:46.510 the meter needle should deflect toward
00:01:49.030 00:01:49.040 zero ohms and return toward infinite
00:01:51.610 00:01:51.620 resistance reverse the probes and you
00:01:55.630 00:01:55.640 should observe the same result if the
00:02:02.710 00:02:02.720 needle does not move or stays near zero
00:02:04.930 00:02:04.940 ohms the capacitor has failed to check a
00:02:09.190 00:02:09.200 dual capacitor you will test between the
00:02:11.380 00:02:11.390 common terminal and each of the other
00:02:13.270 00:02:13.280 terminals the common terminal is often
00:02:16.930 00:02:16.940 identified with the letter C with the
00:02:19.420 00:02:19.430 other terminals labeled fan and herm or
00:02:22.150 00:02:22.160 Kampf
00:02:24.790 00:02:24.800 to test the fan circuit touch one probe
00:02:27.910 00:02:27.920 to the common terminal and the second
00:02:29.980 00:02:29.990 probe to the fan terminal as before the
00:02:33.010 00:02:33.020 needle should deflect toward zero ohms
00:02:34.660 00:02:34.670 and return to infinite resistance
00:02:37.950 00:02:37.960 repeat for the herm or comp circuit a
00:02:42.480 00:02:42.490 standard ohm meter can also help
00:02:44.740 00:02:44.750 determine if the capacitor has shorted
00:02:46.690 00:02:46.700 to ground place one probe on each of the
00:02:50.290 00:02:50.300 terminals while touching the second
00:02:52.000 00:02:52.010 probe to the side of the casing no
00:02:54.820 00:02:54.830 terminal should display continuity if
00:02:57.090 00:02:57.100 the meter does show continuity then the
00:03:00.100 00:03:00.110 capacitor has shorted and will need to
00:03:02.200 00:03:02.210 be replaced a second test will allow you
00:03:06.010 00:03:06.020 to determine if the component is
00:03:07.690 00:03:07.700 operating with a proper capacitance
00:03:09.580 00:03:09.590 rating by measuring the micro farad's
00:03:12.510 00:03:12.520 for this test you will need a capacitor
00:03:15.280 00:03:15.290 tester or a multimeter with a capacitor
00:03:17.980 00:03:17.990 testing function before you begin
00:03:20.890 00:03:20.900 confirm that the charge in the capacitor
00:03:22.480 00:03:22.490 has been released when testing a single
00:03:26.680 00:03:26.690 capacitor note the micro farad rating on
00:03:29.080 00:03:29.090 the component and choose the comparable
00:03:31.300 00:03:31.310 setting on the tester or ammeter now
00:03:35.020 00:03:35.030 connect the probes to the terminals and
00:03:37.080 00:03:37.090 press the button to display the micro
00:03:39.730 00:03:39.740 farad reading the reading should be
00:03:42.790 00:03:42.800 close to the rating on the component
00:03:47.400 00:03:47.410 dual capacitors have 2 micro farad
00:03:50.199 00:03:50.209 ratings a higher rating is typical for
00:03:53.110 00:03:53.120 the herm or comm circuit and a lower
00:03:55.510 00:03:55.520 rating is typical for the fans circuit
00:03:57.640 00:03:57.650 as before you should test each circuit
00:04:01.000 00:04:01.010 separately to determine if the reading
00:04:02.949 00:04:02.959 closely matches the rating on the
00:04:04.510 00:04:04.520 component
00:04:13.180 00:04:13.190 if the reading indicates a low level of
00:04:16.009 00:04:16.019 microfarads the capacitor will need to
00:04:18.590 00:04:18.600 be replaced

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