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How to tell if an Inducer Motor is BAD - Explained Step by Step
WEBVTT Kind: captions Language: en
00:00:00.469 all right today what we're going to be 00:00:02.48000:00:02.490 going over is how to check an inducer 00:00:04.76000:00:04.770 motor so when you call for heat at the 00:00:07.61000:00:07.620 thermostat you turn your button to heat 00:00:09.37900:00:09.389 you turn the temperature up if at the 00:00:12.44000:00:12.450 control board you have 24 volts off from 00:00:15.74000:00:15.750 the W to the c-terminal this is the next 00:00:19.16000:00:19.170 thing that gets called alright so what 00:00:22.37000:00:22.380 we would need to do is we would need to 00:00:25.13000:00:25.140 go ahead and disconnect this alright we 00:00:27.71000:00:27.720 can see if a hundred twenty volts is 00:00:30.05000:00:30.060 coming through these wires right here so 00:00:39.19000:00:39.200 we can come right in the back okay so we 00:00:42.08000:00:42.090 don't have to have our hands near it and 00:00:44.11900:00:44.129 then we can go ahead and call for for 00:00:47.27000:00:47.280 Heat 00:00:47.60000:00:47.610 all right I'm going to turn our 00:00:54.77000:00:54.780 multimeter on and see if we get our 00:01:02.45000:01:02.460 voltage all right so we're calling for 00:01:08.27000:01:08.280 heat right here these wires right here 00:01:10.73000:01:10.740 the hot and common wire 122 volts going 00:01:14.06000:01:14.070 to the inducer motor the problem is the 00:01:17.09000:01:17.100 inducer motor is not turning off nice 00:01:19.28000:01:19.290 and then we go to the next step 00:01:20.84000:01:20.850 alright which we're going to turn the 00:01:22.85000:01:22.860 furnace off at this point turn it off 00:01:24.80000:01:24.810 all right we get no voltage there 00:01:27.73000:01:27.740 everything's off all right now we're 00:01:30.44000:01:30.450 going to do is we're going to disconnect 00:01:32.30000:01:32.310 our capacitor and we're going to check 00:01:35.63000:01:35.640 our capacitor we're just going to go 00:01:37.91000:01:37.920 ahead and short this out right here is 00:01:41.53900:01:41.549 any remaining voltage normally what 00:01:43.52000:01:43.530 happens is when a motor runs it'll 00:01:45.44000:01:45.450 dissipate the the capacitor out of that 00:01:48.41000:01:48.420 unless it's a start like a start 00:01:50.12000:01:50.130 capacitor with a relay that up kicks it 00:01:52.01000:01:52.020 out so we're going to switch our 00:01:55.67000:01:55.680 multimeter over to MFD 00:01:57.70900:01:57.719 and we're going to check our capacitor 00:02:02.03000:02:02.040 here alright this is a five MFD or 5uf 00:02:05.56900:02:05.579 capacitor and we're reading for point 00:02:07.16000:02:07.170 nine three so the capacitor is good it's 00:02:09.35000:02:09.360 within five percent all right the next 00:02:11.66000:02:11.670 step we're going to do we're going to 00:02:12.65000:02:12.660 leave that disconnected 00:02:13.88000:02:13.890 now we're going to take the wires going 00:02:16.04000:02:16.050 to the inducer motor alright and we're 00:02:19.43000:02:19.440 going to go in the back and we're going 00:02:20.57000:02:20.580 to check resistance from white to black 00:02:26.20000:02:26.210 alright when we check that we're going 00:02:29.60000:02:29.610 to turn that multimeter over to the 00:02:31.19000:02:31.200 upside-down horseshoe and we read 80 to 00:02:39.92000:02:39.930 85 ohms of resistance okay so the coil 00:02:44.93000:02:44.940 inside the motor is good right we're 00:02:48.47000:02:48.480 going to check from hot to ground now 00:02:52.44900:02:52.459 all right we should not have any any 00:02:54.80000:02:54.810 reading on that if we had a dead short 00:02:56.93000:02:56.940 on that that would mean it would be zero 00:02:59.57000:02:59.580 point zero ohms of resistance to 00:03:01.31000:03:01.320 electrical flow that would be a dead 00:03:03.02000:03:03.030 short like the windings inside the motor 00:03:04.82000:03:04.830 have burnout and are touching the frame 00:03:07.85000:03:07.860 of the motor so that would not be good 00:03:09.29000:03:09.300 okay it would also not be good if the 00:03:11.69000:03:11.700 black and white wires had zero point 00:03:13.40000:03:13.410 zero ohms of resistance because that 00:03:15.35000:03:15.360 would be the same thing it would 00:03:16.55000:03:16.560 actually be shorted onto the common wire 00:03:18.71000:03:18.720 inside the motor all right so it's good 00:03:21.38000:03:21.390 that we have resistance value that mean 00:03:23.44900:03:23.459 that that means that work is going to 00:03:25.03900:03:25.049 happen so then you want to go ahead and 00:03:26.60000:03:26.610 check and maybe there's a bearing that's 00:03:29.00000:03:29.010 stuck on the inducer motor obviously 00:03:31.72900:03:31.739 that might be one of the very first 00:03:32.84000:03:32.850 things that you check on this but I'm 00:03:34.91000:03:34.920 just kind of rolling through everything 00:03:36.71000:03:36.720 on here you want to check that make sure 00:03:39.97900:03:39.989 feel the motor or see if it's really hot 00:03:42.19000:03:42.200 all of those types of things all right 00:03:44.44900:03:44.459 but you want to spin it freewheel and 00:03:46.40000:03:46.410 make sure that the inside is not bound 00:03:49.00900:03:49.019 up as well not only the bearings in the 00:03:50.63000:03:50.640 inducer motor but inside the inducer 00:03:52.28000:03:52.290 motor housing okay so that's basically 00:03:54.11000:03:54.120 it for the inducer motor alright check 00:03:56.84000:03:56.850 the inducer motor I hope you enjoyed 00:03:58.22000:03:58.230 yourself see you next time at AC service 00:03:59.78000:03:59.790 step
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