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Troubleshooting if a Thermostat is BAD - Explained!

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Kind: captions
Language: en

00:00:08.810
all right this video is about how to
00:00:11.630 00:00:11.640 tell if your thermostat is bad first
00:00:14.270 00:00:14.280 thing you're going to want to do is
00:00:15.350 00:00:15.360 you're going to want to pull apart right
00:00:17.210 00:00:17.220 here on your thermostat open up the face
00:00:20.179 00:00:20.189 all right so I'm assuming that this LCD
00:00:25.100 00:00:25.110 display will be lit up but we're not
00:00:27.350 00:00:27.360 able to turn the fan on able to turn the
00:00:29.749 00:00:29.759 heat on I'm able to turn the cooling off
00:00:31.909 00:00:31.919 so you have red as your 24 to 28 volt
00:00:36.530 00:00:36.540 power wire coming in and then it goes
00:00:39.200 00:00:39.210 back out either the white yellow or a
00:00:42.619 00:00:42.629 green wire depending on what your
00:00:44.270 00:00:44.280 telling you to do the thermostat when
00:00:46.459 00:00:46.469 telling me fan to turn on the 24 volts
00:00:49.040 00:00:49.050 will be coming in the red and and coming
00:00:51.770 00:00:51.780 back out the G if it was coming in as
00:00:55.549 00:00:55.559 red and going back out as the Y that
00:00:57.709 00:00:57.719 will be for a cooling 24 volts coming in
00:01:00.290 00:01:00.300 for red and if we turn the heat on it
00:01:02.540 00:01:02.550 will come back out the white wire and go
00:01:04.520 00:01:04.530 to the furnace control board in order to
00:01:07.130 00:01:07.140 tell it what the disk
00:01:08.149 00:01:08.159 okay so these are your signal wires so
00:01:10.520 00:01:10.530 what we really need to do here is to
00:01:12.620 00:01:12.630 determine if if the fan is going to turn
00:01:14.720 00:01:14.730 on we could take the display and the
00:01:18.380 00:01:18.390 control board out of play a couple of
00:01:20.990 00:01:21.000 different ways you could take a
00:01:22.280 00:01:22.290 thermostat wire like the strip both ends
00:01:24.860 00:01:24.870 and you could use as a jumper all right
00:01:27.140 00:01:27.150 so you can pull this faceplate off this
00:01:30.890 00:01:30.900 24 volt faceplate while the furnace is
00:01:33.680 00:01:33.690 on or the air handler is on all right
00:01:35.780 00:01:35.790 it's 24 volts and all Assizes signal
00:01:38.180 00:01:38.190 wires the only way that you could short
00:01:39.980 00:01:39.990 out the thermostat wires will be by
00:01:42.070 00:01:42.080 connecting the red and the blue wire
00:01:45.110 00:01:45.120 together that would short out the
00:01:46.850 00:01:46.860 transformer and the furnace Warsh or
00:01:48.740 00:01:48.750 short out the fuse protecting the
00:01:50.510 00:01:50.520 transformer in the furnace all right so
00:01:52.130 00:01:52.140 you leave them alone and if you don't
00:01:54.740 00:01:54.750 even have a common because you have
00:01:58.220 00:01:58.230 batteries in your thermostat you know
00:02:00.470 00:02:00.480 then then there's nothing to short it
00:02:01.970 00:02:01.980 out against right there unless you hit a
00:02:03.650 00:02:03.660 common somewheres else
00:02:05.440 00:02:05.450 all right we're ground so you have 24
00:02:10.100 00:02:10.110 volts in the arm okay you're going to
00:02:11.780 00:02:11.790 connect that over to the G if when you
00:02:15.350 00:02:15.360 do this and you put you know pressure on
00:02:17.930 00:02:17.940 it you want to keep make sure your
00:02:20.030 00:02:20.040 fingers are safe and not touching
00:02:21.559 00:02:21.569 the electrode there but if that turns
00:02:25.819 00:02:25.829 the fan on then you know that the this
00:02:30.649 00:02:30.659 faceplate is bad okay and that the
00:02:32.959 00:02:32.969 terminal terminal board back here is
00:02:35.300 00:02:35.310 still good all right but if you want to
00:02:38.209 00:02:38.219 take this out of play we could we go
00:02:40.940 00:02:40.950 about that as well if you didn't have a
00:02:43.220 00:02:43.230 jumper like this you could even take
00:02:45.979 00:02:45.989 some pair of needlenose okay you could
00:02:47.899 00:02:47.909 go from here to here all right and jump
00:02:52.940 00:02:52.950 it out that one you could jump it out
00:02:55.369 00:02:55.379 with set of jumper wires you know you
00:02:59.270 00:02:59.280 could you could push this in here and
00:03:00.920 00:03:00.930 this in here just make sure that they're
00:03:02.149 00:03:02.159 smaller than the opening okay and that
00:03:04.490 00:03:04.500 would jump it out as well
00:03:05.539 00:03:05.549 all right in this case since we're going
00:03:07.970 00:03:07.980 to pull the wires out we're going to
00:03:09.709 00:03:09.719 actually take this out of flight I would
00:03:11.149 00:03:11.159 suggest that go ahead and turn your
00:03:12.459 00:03:12.469 furnace or air handling off right before
00:03:15.289 00:03:15.299 you go touching any of these wires and
00:03:17.300 00:03:17.310 pulling them out turn the furnace off
00:03:19.610 00:03:19.620 confirm that it's off then you're going
00:03:22.099 00:03:22.109 to go ahead and turn your screw
00:03:26.300 00:03:26.310 counterclockwise and pull your red wire
00:03:28.159 00:03:28.169 out I always like to start with the
00:03:31.369 00:03:31.379 green wire you know because it just
00:03:32.689 00:03:32.699 turns the fan on if you were to try to
00:03:36.860 00:03:36.870 jump the Y and the red out then there
00:03:40.909 00:03:40.919 would be no 5 minute on delay to keep
00:03:44.270 00:03:44.280 the compressor safe so if you were to
00:03:45.679 00:03:45.689 turn these on and the compressor turned
00:03:47.899 00:03:47.909 on and then you turn the compressor off
00:03:51.050 00:03:51.060 and then immediately turn it back on
00:03:52.249 00:03:52.259 again that will do damage to the
00:03:53.449 00:03:53.459 compressor and you don't want to do that
00:03:55.159 00:03:55.169 all right so in in the thermostat here
00:03:57.589 00:03:57.599 there's a 5 minute on delay between when
00:04:01.909 00:04:01.919 you've turn the compressor off when you
00:04:04.249 00:04:04.259 turn it back on again
00:04:05.179 00:04:05.189 just just to keep the compressor safe
00:04:07.249 00:04:07.259 all right but anyway so if you just
00:04:09.259 00:04:09.269 connect the red and the G wires together
00:04:11.929 00:04:11.939 we can connect them with alligator clips
00:04:18.129 00:04:18.139 or if you don't have that just a simple
00:04:21.379 00:04:21.389 wire nut will do you can connect it like
00:04:24.830 00:04:24.840 this or you could wire knock them
00:04:28.010 00:04:28.020 together like this
00:04:33.550 00:04:33.560 all right now you go ahead and turn your
00:04:36.460 00:04:36.470 furnace back on you see that turn your
00:04:42.560 00:04:42.570 furnace back on and see if the fan turns
00:04:47.780 00:04:47.790 on all right if it does not turn on then
00:04:50.630 00:04:50.640 your problems back at your furnace all
00:04:52.580 00:04:52.590 right so that's how you would do all
00:04:57.050 00:04:57.060 right if you wanted to turn the power
00:04:59.120 00:04:59.130 back off to your furnace and why are not
00:05:01.130 00:05:01.140 the or and the white wire together to
00:05:03.410 00:05:03.420 see if you your heat will turn on the
00:05:05.060 00:05:05.070 sequence of operation of your heat will
00:05:06.440 00:05:06.450 turn on then you can do that too I would
00:05:08.630 00:05:08.640 just be careful with make sure your
00:05:10.970 00:05:10.980 furnace is off first of all I will be
00:05:12.800 00:05:12.810 careful with maybe touching this to the
00:05:15.590 00:05:15.600 yellow wire because you don't want to do
00:05:17.210 00:05:17.220 damage to that compressor because it's
00:05:19.880 00:05:19.890 going to have low pressure refrigerant
00:05:21.710 00:05:21.720 on one side high pressure refrigerant on
00:05:23.450 00:05:23.460 the other side and it's going to have a
00:05:24.770 00:05:24.780 heck of a time trying to turn back on if
00:05:27.110 00:05:27.120 it hasn't been given a chance to
00:05:29.120 00:05:29.130 equalize those refrigerants so the
00:05:30.680 00:05:30.690 simplest thing is to just connect the
00:05:32.870 00:05:32.880 red and the gene together all right so
00:05:35.180 00:05:35.190 that's it that's how you tell if your
00:05:37.220 00:05:37.230 thermostat is bad if that fan does
00:05:39.200 00:05:39.210 tunnel come on then you just need to
00:05:41.180 00:05:41.190 replace this thermostat right right as
00:05:43.580 00:05:43.590 I've said before just make sure your
00:05:46.460 00:05:46.470 powers off while you're doing it all
00:05:48.830 00:05:48.840 right okay out a good time and see you
00:05:51.620 00:05:51.630 next time at AC service calm

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