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What to look for if you get central heating, but no hot water.

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Kind: captions
Language: en

00:00:00.089
hi one big al um what to do if you find
00:00:04.579 00:00:04.589 you've got heating it's all running
00:00:07.610 00:00:07.620 nicely but absolutely no hot water at
00:00:10.459 00:00:10.469 all what sort of thing do you need to
00:00:13.580 00:00:13.590 look for um so I'm gonna ask one Oh
00:00:16.220 00:00:16.230 Benny has asked me for this one again so
00:00:18.590 00:00:18.600 anybody else that needs to know this one
00:00:20.960 00:00:20.970 this is the only answers I have for you
00:00:22.849 00:00:22.859 being a plumber this is a man I'm
00:00:25.009 00:00:25.019 sticking with um it's a couple of things
00:00:27.140 00:00:27.150 first of all if you've got a combi
00:00:28.460 00:00:28.470 boiler tough luck really you might as
00:00:36.200 00:00:36.210 well just get a engineering I'm afraid
00:00:39.760 00:00:39.770 that's so complex inside it could be
00:00:42.860 00:00:42.870 many things okay so this refers to
00:00:44.840 00:00:44.850 really a domestic heating system with a
00:00:48.080 00:00:48.090 conventional boiler hot water cylinder
00:00:51.290 00:00:51.300 and fne header tank guys we've got that
00:00:55.189 00:00:55.199 type of system this is for you if you've
00:00:57.170 00:00:57.180 got combi boiler
00:00:58.189 00:00:58.199 you better start calling the heating
00:01:00.470 00:01:00.480 engineer right this minute because it's
00:01:02.389 00:01:02.399 a bigger problem than you think okay get
00:01:05.090 00:01:05.100 that one out of the way now we're going
00:01:06.590 00:01:06.600 to move on okay what to look for um the
00:01:09.230 00:01:09.240 first most one the most one it uses is a
00:01:12.590 00:01:12.600 40 motorized valve if you've got a
00:01:16.609 00:01:16.619 system with two motorized valves which a
00:01:19.219 00:01:19.229 lot of common systems do have you may
00:01:22.039 00:01:22.049 find that the valve that controls the
00:01:25.660 00:01:25.670 central heat you know is fine and it's
00:01:30.710 00:01:30.720 running but the hot water one has gone
00:01:33.469 00:01:33.479 down and you can check that by it
00:01:35.929 00:01:35.939 actually there is a little leaver you
00:01:38.210 00:01:38.220 see if I show you this now I'm going to
00:01:40.160 00:01:40.170 show them draw I've got here now okay
00:01:42.950 00:01:42.960 down there and there's my little drawing
00:01:45.800 00:01:45.810 but over there and there's our boiler
00:01:49.039 00:01:49.049 and there's our flow going up and ran
00:01:51.170 00:01:51.180 and if you've got two motorized valves
00:01:53.210 00:01:53.220 like this um well they've got little
00:01:56.389 00:01:56.399 levers on the bottom generally um
00:01:58.819 00:01:58.829 now once for hot water you can see it
00:02:01.219 00:02:01.229 goes into the cylinder and goes around a
00:02:03.170 00:02:03.180 corner comes out
00:02:04.350 00:02:04.360 and it goes back to your boiler but that
00:02:08.160 00:02:08.170 that one could be a 41 and you can tell
00:02:11.310 00:02:11.320 by pulling that lever across manually if
00:02:13.530 00:02:13.540 you put it across manually in your opens
00:02:15.390 00:02:15.400 up you'll find you'll be able to get hot
00:02:17.550 00:02:17.560 water again it means it isn't working
00:02:20.100 00:02:20.110 properly and it could well be the
00:02:22.170 00:02:22.180 cylinder stat and so for not calling
00:02:24.240 00:02:24.250 heat for it so it could be even a stat
00:02:26.940 00:02:26.950 there or the actual motorized bowel
00:02:28.680 00:02:28.690 normally nine times out of ten is the
00:02:30.810 00:02:30.820 motorized valve that's gone and
00:02:33.180 00:02:33.190 generally that is the case to me knew
00:02:35.790 00:02:35.800 that valve there you can just get a head
00:02:37.920 00:02:37.930 doing it for the right model and replace
00:02:39.480 00:02:39.490 it fairly easily okay
00:02:41.760 00:02:41.770 that's genuinely the main cause if
00:02:44.400 00:02:44.410 you've got motorized batteries generally
00:02:46.800 00:02:46.810 most most new modern systems do have and
00:02:49.890 00:02:49.900 that can be the problem and I say very
00:02:52.230 00:02:52.240 rarely again may be that the step okay
00:02:55.500 00:02:55.510 that covers the motorized valve system
00:02:57.420 00:02:57.430 there's a more modern one but there are
00:02:59.640 00:02:59.650 some systems around that are very old
00:03:03.420 00:03:03.430 and if you've got one twenty thirty
00:03:05.250 00:03:05.260 years old it doesn't have any motorized
00:03:06.840 00:03:06.850 valves and it relies on gravity to
00:03:10.100 00:03:10.110 circulate the hot water so if you've got
00:03:13.440 00:03:13.450 this type of system this is what can
00:03:15.240 00:03:15.250 quite commonly happen um if I show you
00:03:18.240 00:03:18.250 this drawing you'll see here that here
00:03:22.680 00:03:22.690 we've got our boil up and quite often in
00:03:25.140 00:03:25.150 this is my house actually this is this
00:03:27.000 00:03:27.010 is our good gravity and the flow goes up
00:03:29.840 00:03:29.850 and it goes across the top of the loft
00:03:32.460 00:03:32.470 like this and drops down into the
00:03:35.400 00:03:35.410 cylinder now I mean it can go up and
00:03:38.490 00:03:38.500 still cut across and not have too much
00:03:40.170 00:03:40.180 here to get into the cylinder there into
00:03:42.330 00:03:42.340 the flow and then the oddity to return
00:03:43.949 00:03:43.959 comes down and goes back to the boiler
00:03:45.630 00:03:45.640 but what can happen over the summer
00:03:47.729 00:03:47.739 period is this little F and E tank in
00:03:50.759 00:03:50.769 your loft space I've drawn as the loft
00:03:53.190 00:03:53.200 space um that bull cocking near can jam
00:03:57.210 00:03:57.220 up that jams up over the summer period
00:04:00.120 00:04:00.130 because it's not feeling much because
00:04:01.500 00:04:01.510 you're not using your heat or anything
00:04:02.820 00:04:02.830 so that's got no expansion to take up it
00:04:05.430 00:04:05.440 can stick and then that water level
00:04:07.590 00:04:07.600 drops away and gradually for the summer
00:04:10.110 00:04:10.120 um it back rates away and your boil is
00:04:12.870 00:04:12.880 still probably going for the hot water
00:04:13.980 00:04:13.990 so you are using some evaporate
00:04:16.550 00:04:16.560 well eventually the water level drops
00:04:18.560 00:04:18.570 down and down to it dropped below here
00:04:20.960 00:04:20.970 and in here is in allowed to enter here
00:04:23.960 00:04:23.970 and once you've got that in there your
00:04:26.630 00:04:26.640 whole was stopped dead and and you may
00:04:29.690 00:04:29.700 find that some of the rats are still go
00:04:31.550 00:04:31.560 because they're on a bottom level
00:04:32.870 00:04:32.880 they're lower they're on the on the
00:04:34.550 00:04:34.560 floor level if you like and they may
00:04:36.830 00:04:36.840 still keep going because they've got war
00:04:39.110 00:04:39.120 in them but you would definitely a hot
00:04:40.730 00:04:40.740 wall of a of grinding halt and this
00:04:43.100 00:04:43.110 is a system as I say that's got no
00:04:44.780 00:04:44.790 motorized valves inning at all and
00:04:47.810 00:04:47.820 relies entirely on gravity and there are
00:04:49.880 00:04:49.890 still quite a few those old systems
00:04:51.320 00:04:51.330 around so that it's always a first pour
00:04:53.570 00:04:53.580 call if you've got this problem with an
00:04:56.540 00:04:56.550 old system get up in the loft there and
00:04:58.310 00:04:58.320 check that little tank and see if it's
00:05:01.660 00:05:01.670 got warning and if it hasn't you name it
00:05:04.670 00:05:04.680 a problem if it hasn't just got that
00:05:06.440 00:05:06.450 ball and armor shake long that's all it
00:05:09.080 00:05:09.090 needs
00:05:09.470 00:05:09.480 move up and down and it will crack and
00:05:12.110 00:05:12.120 gradu dog will start to pour back in
00:05:14.000 00:05:14.010 again make sure it shuts off okay and if
00:05:17.330 00:05:17.340 in doubt we'll put a new ball valve in
00:05:19.550 00:05:19.560 there not much money anyway if you wanna
00:05:22.100 00:05:22.110 be safe than sorry and it might happen
00:05:23.420 00:05:23.430 again in the future be near the ball
00:05:25.490 00:05:25.500 valve and you know you've got that
00:05:26.570 00:05:26.580 problem sorry
00:05:27.650 00:05:27.660 and that generally is around about it
00:05:29.770 00:05:29.780 that's all the problems to do with hot
00:05:33.440 00:05:33.450 water so I think about covers that one
00:05:35.420 00:05:35.430 thanks very much for watching guys and
00:05:37.060 00:05:37.070 tune in to my channel dirt and 33 for
00:05:39.800 00:05:39.810 any more tips plumbing heating and DIY
00:05:42.140 00:05:42.150 thanks for watching

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