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Furnace Blower Not Working - How to Check It

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Language: en

00:00:08.240
hey guys J here with word of advice TV
00:00:11.030 00:00:11.040 in my comment sections on a lot of my
00:00:13.009 00:00:13.019 a/c fixing videos people are asking me
00:00:15.470 00:00:15.480 how do I check if my blower motor in my
00:00:18.019 00:00:18.029 furnace is bad or not so for example the
00:00:20.179 00:00:20.189 unit outside will turn on the compressor
00:00:22.160 00:00:22.170 and a fan everything seems to be working
00:00:23.540 00:00:23.550 out there but you come downstairs and
00:00:25.880 00:00:25.890 the blower motor is not turning out so
00:00:28.040 00:00:28.050 is it simply not getting power or is the
00:00:29.990 00:00:30.000 blower motor just burnt out chances are
00:00:32.150 00:00:32.160 if you've been trying to run it for 5-10
00:00:34.160 00:00:34.170 minutes if you take your furnace doors
00:00:36.530 00:00:36.540 off and if you carefully reach in where
00:00:39.080 00:00:39.090 the blower motor is in fact you might
00:00:41.060 00:00:41.070 want to turn the power switch off and if
00:00:43.790 00:00:43.800 you have a voltage spend confirm to make
00:00:46.250 00:00:46.260 sure you don't have any power anywhere
00:00:47.779 00:00:47.789 so you don't accidentally get shocked as
00:00:51.020 00:00:51.030 you can see I have power here see that
00:00:52.790 00:00:52.800 with my voltage pen so you want to turn
00:00:55.459 00:00:55.469 that off and I can check again
00:00:58.369 00:00:58.379 I have no power anywhere now so now that
00:01:03.470 00:01:03.480 I've verified there's no power
00:01:04.850 00:01:04.860 just take your furnace doors off if you
00:01:06.649 00:01:06.659 reach in on the motor side which is
00:01:08.330 00:01:08.340 typically on the right side and just
00:01:11.469 00:01:11.479 grab the motor a lot of times if it's
00:01:15.200 00:01:15.210 been trying to start the motor will be
00:01:16.730 00:01:16.740 super hot also if you go on the left
00:01:20.630 00:01:20.640 side and feel the squirrel-cage a lot of
00:01:24.710 00:01:24.720 times it'll not spin very freely it'll
00:01:26.810 00:01:26.820 feel kind of sluggish and seized up just
00:01:29.660 00:01:29.670 trying to spin that by hand be careful
00:01:31.520 00:01:31.530 though because the fins can be sharp
00:01:33.429 00:01:33.439 those are pretty much obvious giveaways
00:01:36.620 00:01:36.630 that your motor is bad if that motor is
00:01:38.780 00:01:38.790 super hot
00:01:39.530 00:01:39.540 another possibility though is that your
00:01:41.690 00:01:41.700 capacitor is actually weak or completely
00:01:44.630 00:01:44.640 dead and your capacitor is typically
00:01:47.179 00:01:47.189 going to be on the motor housing
00:01:48.289 00:01:48.299 somewhere mine for example is right here
00:01:50.719 00:01:50.729 it's going to be that silver cylinder so
00:01:53.389 00:01:53.399 what you want to do is take off the
00:01:54.710 00:01:54.720 capacitor just got like the wires from
00:01:56.270 00:01:56.280 it and using your meter on the micro
00:01:58.819 00:01:58.829 farad selection right here
00:02:00.999 00:02:01.009 you want to check the capacitor and see
00:02:03.800 00:02:03.810 if the rating is matching up the label
00:02:06.319 00:02:06.329 on it now I won't go into how to check
00:02:08.419 00:02:08.429 the capacitor in this video but I do
00:02:10.339 00:02:10.349 have a whole nother video that talks all
00:02:12.140 00:02:12.150 about the capacitor
00:02:13.230 00:02:13.240 to check it and replace it in an AC
00:02:14.880 00:02:14.890 condenser unit but it would be the same
00:02:17.070 00:02:17.080 thing here too so I won't get into that
00:02:19.050 00:02:19.060 now but if you want just check out the
00:02:20.700 00:02:20.710 other video to know more about the
00:02:22.020 00:02:22.030 capacitor part so if your capacitor is
00:02:24.390 00:02:24.400 good and your motor is hot then almost
00:02:27.720 00:02:27.730 guaranteed that you need a new motor but
00:02:29.970 00:02:29.980 we don't want to guess so to know for
00:02:32.070 00:02:32.080 sure what you want to do is turn that
00:02:34.620 00:02:34.630 power back on we're gonna do this test
00:02:36.270 00:02:36.280 with the power on turn the power back on
00:02:39.570 00:02:39.580 take out your furnace doors make sure
00:02:41.640 00:02:41.650 your door switch is taped otherwise you
00:02:44.070 00:02:44.080 won't have power anywhere when you're
00:02:45.870 00:02:45.880 taping it or putting a screw in it or
00:02:48.000 00:02:48.010 jamming it or whatever make sure you
00:02:50.070 00:02:50.080 don't touch any connectors in the back
00:02:51.450 00:02:51.460 because it is 120 volts and you will get
00:02:54.000 00:02:54.010 it shocked and possibly something worse
00:02:56.100 00:02:56.110 and then you want to locate your fan
00:02:58.110 00:02:58.120 wires the wires coming from your fan
00:03:00.630 00:03:00.640 motor in my case it's the blue black red
00:03:03.600 00:03:03.610 and white and see where they go into on
00:03:05.880 00:03:05.890 the control board in my case black goes
00:03:08.790 00:03:08.800 to cooling right there I have nothing on
00:03:11.430 00:03:11.440 Park
00:03:12.060 00:03:12.070 no spare wires or no spare fan speeds
00:03:14.670 00:03:14.680 red is heat low stage and blue is heat
00:03:18.420 00:03:18.430 high stage so depending on if you're in
00:03:21.660 00:03:21.670 the furnace season or AC season right
00:03:24.570 00:03:24.580 now we're in an AC season you will pull
00:03:26.280 00:03:26.290 that wire off so in my case it'll be the
00:03:28.980 00:03:28.990 black wire I'll pull that wire off like
00:03:33.150 00:03:33.160 that and also I will find where my
00:03:36.420 00:03:36.430 common is coming from the motor and
00:03:39.330 00:03:39.340 usually it'll say search or circulator
00:03:41.730 00:03:41.740 and I will pull that off as well
00:03:45.920 00:03:45.930 after you have those two wires pulled
00:03:48.540 00:03:48.550 off with your thermostat calling for
00:03:52.020 00:03:52.030 cooling your outside unit running the
00:03:54.690 00:03:54.700 fan should be turning on so what you
00:03:56.580 00:03:56.590 want to do is just verify that it's
00:03:58.170 00:03:58.180 getting power so you'll put one lead on
00:04:00.420 00:04:00.430 the cool Spade where he pulled the
00:04:02.490 00:04:02.500 cooling speed wire off of one of your
00:04:05.640 00:04:05.650 leads will go on that and the other one
00:04:07.410 00:04:07.420 will go on the common or the circulator
00:04:09.210 00:04:09.220 common the other wire that you pulled
00:04:10.890 00:04:10.900 off you want to have that set to voltage
00:04:13.500 00:04:13.510 and when you check that if your motor is
00:04:18.000 00:04:18.010 getting power it'll have a hundred
00:04:19.800 00:04:19.810 twenty volts if you're not getting
00:04:21.930 00:04:21.940 voltage that means actually your control
00:04:24.900 00:04:24.910 board is simply not sending power
00:04:26.530 00:04:26.540 to the blower motor and it's probably
00:04:28.540 00:04:28.550 the board that's bad and not the motor
00:04:30.730 00:04:30.740 itself but if the board is sending a
00:04:33.700 00:04:33.710 hundred twenty volts to the blower motor
00:04:36.220 00:04:36.230 that means the blower motor is bad if
00:04:39.130 00:04:39.140 it's not turning on and then don't
00:04:40.990 00:04:41.000 forget to plug the wires back in now if
00:04:43.540 00:04:43.550 you don't have a meter and you can't
00:04:45.070 00:04:45.080 check if your blower motor is getting
00:04:46.720 00:04:46.730 voltage or not one way you could try
00:04:48.700 00:04:48.710 testing it is to hotwire it directly so
00:04:52.300 00:04:52.310 for example you turn your power switch
00:04:54.850 00:04:54.860 off you don't want to have any power
00:04:57.240 00:04:57.250 confirm with the voltage pen or a meter
00:04:59.470 00:04:59.480 that you don't have any voltage anywhere
00:05:01.330 00:05:01.340 and I don't and then what you want to do
00:05:05.260 00:05:05.270 is find your line terminal where the
00:05:08.350 00:05:08.360 power comes into the control board
00:05:10.060 00:05:10.070 you want to pull that wire off so in my
00:05:14.170 00:05:14.180 case it'll be this one right here it'll
00:05:18.250 00:05:18.260 usually be coming from the door switch
00:05:20.790 00:05:20.800 pull that wire off and then if you're
00:05:24.310 00:05:24.320 the furnace season you want to pull off
00:05:26.080 00:05:26.090 your heat wire if you're into AC season
00:05:28.150 00:05:28.160 which we are right now you wanna pull
00:05:29.920 00:05:29.930 off your cooling wire which is this one
00:05:31.660 00:05:31.670 basically all you're going to do is
00:05:33.310 00:05:33.320 bypass the control board and send power
00:05:35.770 00:05:35.780 to the blower motor directly so this is
00:05:39.130 00:05:39.140 line voltage coming in from the junction
00:05:41.140 00:05:41.150 box or the power switch all you got to
00:05:43.720 00:05:43.730 do is wire nut if you want you can snip
00:05:46.990 00:05:47.000 these two wires off and then why you're
00:05:50.620 00:05:50.630 not them together
00:05:51.690 00:05:51.700 that'll be sending power directly to the
00:05:55.210 00:05:55.220 blower motor so you would snip them both
00:05:57.940 00:05:57.950 put the wire nut on will strip them and
00:06:00.700 00:06:00.710 then put the way that on to tie it
00:06:02.920 00:06:02.930 straight into power if your blower motor
00:06:05.410 00:06:05.420 comes on that means you know your
00:06:07.900 00:06:07.910 control board is bad it's just not
00:06:09.490 00:06:09.500 sending power to the motor if the blower
00:06:12.850 00:06:12.860 motor does not come on while it's
00:06:15.100 00:06:15.110 bypassed like that that means your
00:06:16.960 00:06:16.970 blower motor is bad and it needs to be
00:06:18.730 00:06:18.740 replaced and the way I usually do it in
00:06:21.040 00:06:21.050 the field when I do this test or
00:06:24.130 00:06:24.140 sometimes if I need to order a customer
00:06:25.960 00:06:25.970 a control board and just to get them by
00:06:28.260 00:06:28.270 until I can get the new board in I
00:06:31.260 00:06:31.270 usually use a spade like that a splitter
00:06:34.170 00:06:34.180 so I'll put the door switch on one end
00:06:37.440 00:06:37.450 I'll put the cooling speed from the fan
00:06:40.600 00:06:40.610 on the other end like that and then I
00:06:44.560 00:06:44.570 would just plug this right back in to
00:06:47.260 00:06:47.270 the line voltage terminal right here and
00:06:51.270 00:06:51.280 that will be sending power to my motor
00:06:53.830 00:06:53.840 directly from the power switch instead
00:06:56.290 00:06:56.300 of through the control board
00:06:57.490 00:06:57.500 well guys and that is how you check if
00:06:59.200 00:06:59.210 your blower motor is bad or if it's just
00:07:01.300 00:07:01.310 the control board not sending power to
00:07:02.950 00:07:02.960 it hopefully you found this video useful
00:07:04.360 00:07:04.370 thank you so much for watching don't
00:07:06.310 00:07:06.320 forget to mash that like button on the
00:07:07.600 00:07:07.610 way out and I'll see you next time
00:07:24.450 00:07:24.460 you

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