/ News & Press / Video / Combination boiler no hot water problem and fix _ How to clean a blocked plate heat exchanger
Combination boiler no hot water problem and fix _ How to clean a blocked plate heat exchanger
WEBVTT Kind: captions Language: en
00:00:00.380 [Music] 00:00:05.17000:00:05.180 hey what's going on guys it's go gasps 00:00:07.82000:00:07.830 here move another episode of playing 101 00:00:11.78000:00:11.790 in this episode we're gonna diagnose a 00:00:14.69000:00:14.700 hot water fault in this particular case 00:00:17.66000:00:17.670 in an alpha boiler and we're gonna clean 00:00:20.42000:00:20.430 out the plate heat exchanger as well if 00:00:23.54000:00:23.550 you enjoy please drop a like and if you 00:00:26.30000:00:26.310 want to see more service bits and 00:00:28.07000:00:28.080 gasworks be sure to subscribe and check 00:00:30.65000:00:30.660 out my channel 00:00:39.48000:00:39.490 you 00:00:45.54900:00:45.559 so I've been called to this alpha in 00:00:48.22900:00:48.239 tech 30 see the hot water is going hot 00:00:51.79900:00:51.809 cold hot cold if you look at the display 00:00:54.81900:00:54.829 with the hot tap on it's rising 00:00:57.31000:00:57.320 extremely quickly and goes to high 00:01:01.43000:01:01.440 levels 80s 90s so immediately I'm sure 00:01:08.24000:01:08.250 that the plate heat exchanger is blocked 00:01:10.07000:01:10.080 and that temperature is just rising too 00:01:12.64900:01:12.659 high 00:01:18.97000:01:18.980 be sure to have some spare washers these 00:01:23.06000:01:23.070 aren't the washers for this boiler but 00:01:24.71000:01:24.720 this is a good example of ones I've 00:01:26.48000:01:26.490 taken out where they're just completely 00:01:28.43000:01:28.440 perished and would leak if I put the old 00:01:31.07000:01:31.080 ones back in 00:01:33.23000:01:33.240 so firstly isolate the boiler flow and 00:01:36.38000:01:36.390 return because you only want to drain 00:01:38.42000:01:38.430 the boiler not the whole heating but if 00:01:42.35000:01:42.360 it's the highest point of the house you 00:01:44.89900:01:44.909 can leave the flow and return open and 00:01:47.89900:01:47.909 actually your drain a little bit more - 00:01:49.64000:01:49.650 it's easier 00:01:54.95000:01:54.960 isolate the cold water into the boiler 00:01:57.64900:01:57.659 open a hot tap make sure the water has 00:02:02.19000:02:02.200 stopped then you want to open the drain 00:02:05.73000:02:05.740 off into a bucket or got hosed and 00:02:08.76000:02:08.770 clicked onto that but I've got quite a 00:02:10.52900:02:10.539 lot of room here so I'll just put a 00:02:11.55000:02:11.560 bucket Andy and drain that boiler 00:02:22.19900:02:22.209 isolate the boiler electrically and then 00:02:25.63000:02:25.640 you could begin to take the case off and 00:02:28.57000:02:28.580 this one I'm taking the control pile 00:02:29.86000:02:29.870 down then there's four screws 00:02:31.98000:02:31.990 lift the front cover off at this point 00:02:35.83000:02:35.840 good chance to check the seals make sure 00:02:39.04000:02:39.050 everything's all right 00:02:44.08900:02:44.099 if you can move the electronic control 00:02:47.80900:02:47.819 board or the housing away so you don't 00:02:51.47000:02:51.480 spill any water on it on this boiler you 00:02:54.70900:02:54.719 can disconnect the earth tag and move 00:02:56.75000:02:56.760 the whole control unit but actually this 00:02:59.75000:02:59.760 one was seized on so I couldn't get it 00:03:01.49000:03:01.500 as far away as I wanted to 00:03:05.23000:03:05.240 then get away any obstacles take out the 00:03:08.42000:03:08.430 motor if you need I've taken off this 00:03:10.67000:03:10.680 side panel as well but easier access 00:03:13.58000:03:13.590 have your wet vacuum handy if you have 00:03:17.39000:03:17.400 one because you're gonna get a few drips 00:03:19.16000:03:19.170 and you don't want to get it in the 00:03:20.45000:03:20.460 electrics if you do get it in the 00:03:22.76000:03:22.770 electrics don't turn the power and 00:03:24.65000:03:24.660 obviously get a hair dryer and dry them 00:03:27.26000:03:27.270 out 00:03:35.12000:03:35.13000:03:44.84000:03:44.850 now I can start pulling out the plate 00:03:47.10000:03:47.110 heat exchanger if you can turn it so 00:03:50.07000:03:50.080 it's facing upwards and you're not gonna 00:03:52.05000:03:52.060 spill any more water put it somewhere 00:03:54.66000:03:54.670 safe try and get rid of some of that 00:03:57.24000:03:57.250 excess water so while you're cleaning it 00:03:59.85000:03:59.860 out you don't spill any on any electric 00:04:02.19000:04:02.200 so make sure that's fully drained 00:04:06.15000:04:06.160 here's the play here you change L for 00:04:08.44000:04:08.450 the shards so that definitely needs to 00:04:10.30000:04:10.310 go clean you can tell that is completely 00:04:12.46000:04:12.470 blocked up and causing the problem 00:04:16.02000:04:16.030 descaler I'm using today is max tramp 00:04:18.97000:04:18.980 spirits of salt 00:04:23.76000:04:23.770 take the plate heat exchanger outside so 00:04:27.70000:04:27.710 you got a drain nearby and pour it in 00:04:30.94000:04:30.950 the central heat inside nice and 00:04:33.10000:04:33.110 carefully wet sand gloves keep a bit of 00:04:35.11000:04:35.120 distance you want to get it in there 00:04:37.84000:04:37.850 fill it up so it comes out the other end 00:04:39.82000:04:39.830 and then let it work its magic 00:04:49.55900:04:49.569 leave it in there for a few mins give it 00:04:52.96000:04:52.970 a little knock around use something like 00:04:55.36000:04:55.370 a screwdriver or something that you're 00:04:59.29000:04:59.300 not going to use your hands with you 00:05:00.61000:05:00.620 don't want to get me on your hands and 00:05:02.71000:05:02.720 burn them it is quite strong this stuff 00:05:09.95900:05:09.969 when you're done tip it upside down get 00:05:13.02900:05:13.039 rid of all those chemicals and then get 00:05:14.98000:05:14.990 some fresh water at the ready and pour 00:05:17.43900:05:17.449 it in port and both in this case you've 00:05:19.27000:05:19.280 got Eva on the hot water side we're 00:05:21.36900:05:21.379 gonna flush it out in the sink anyway 00:05:23.02000:05:23.030 but we want to get rid of any that's in 00:05:25.24000:05:25.250 the actual plate 00:05:31.70000:05:31.71000:05:34.60000:05:34.610 next pour it out in the sink blast some 00:05:37.68900:05:37.699 water in those ends get all that excess 00:05:41.83000:05:41.840 out give it a really good shake get any 00:05:44.80000:05:44.810 of those shards out you want to clear it 00:05:46.57000:05:46.580 as much as you can before you put it 00:05:48.39900:05:48.409 back in 00:05:56.18000:05:56.19000:06:07.37000:06:07.380 I'll put your new washes in at this 00:06:09.38000:06:09.390 point fish out the old ones make sure 00:06:11.66000:06:11.670 they were counted for you don't want to 00:06:13.91000:06:13.920 have any missing when you fill up and 00:06:16.01000:06:16.020 get any nasty sprays out yeah begin to 00:06:20.48000:06:20.490 get it into position screw it up 00:06:23.51000:06:23.520 nice and evenly like a tire so you don't 00:06:26.90000:06:26.910 squash near the o-rings in an odd way 00:06:30.25000:06:30.260 once it's in place turn the flow and 00:06:34.04000:06:34.050 return isolate is on and check for leaks 00:06:36.92000:06:36.930 at this point then you want to open the 00:06:42.04000:06:42.050 cold water inlet hi Slater with your hot 00:06:45.62000:06:45.630 tap open just so that relieves the 00:06:48.02000:06:48.030 pressure at this point check for leaks 00:06:50.80000:06:50.810 because it'll be relieved from the 00:06:52.94000:06:52.950 pressure on the tap and then begin to 00:06:54.95000:06:54.960 close the tap down and I'll be at full 00:06:57.65000:06:57.660 pressure check again for leaks if 00:07:00.38000:07:00.390 there's no drips happy days I'll 00:07:02.93000:07:02.940 continue to check for a few minutes just 00:07:05.36000:07:05.370 to make sure you haven't got any weeping 00:07:07.52000:07:07.530 out a bit open a hot tap get rid of any 00:07:12.08000:07:12.090 air in there and also just flush it out 00:07:15.17000:07:15.180 a little bit further begin to fill the 00:07:18.05000:07:18.060 boiler up we pressurize it without the 00:07:21.98000:07:21.990 boiler on make sure the air vent works 00:07:24.53000:07:24.540 if you can't hear that hissing you want 00:07:26.45000:07:26.460 to open that pump nut and believe the 00:07:28.88000:07:28.890 pump so that doesn't burn out and then 00:07:32.30000:07:32.310 we could test what we've done let's turn 00:07:34.25000:07:34.260 the boiler on open the hot tap and in 00:07:37.79000:07:37.800 this case you can see the temperature is 00:07:40.49000:07:40.500 rising much much slower and it now 00:07:43.73000:07:43.740 modulates so success we've cracked this 00:07:48.53000:07:48.540 hot water problem on this particular 00:07:50.06000:07:50.070 boiler again as always any questions 00:07:54.22000:07:54.230 just drop them in the comments below and 00:07:56.63000:07:56.640 I'll be happy to answer them 00:07:58.70000:07:58.710 just folks
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