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How to test 3 wire flow sensors. Vaillant boiler no hot water. Combination Boiler. My first video.

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HeatingGeek

HeatingGeek

Күн бұрын

How to test 3 wire flow sensors on boilers etc
Shown on a Vaillant Turbomax Plus. No hot water, check out how to test this stuff.
To support this content and get access to the PDF files to go with this training click here: / heatinggeeks
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Пікірлер: 148
@tomstrutton4351
@tomstrutton4351 5 жыл бұрын
Really informative, I'm gas safe but lack intimate knowledge on boilers. Learning all the time
@HeatingGeek
@HeatingGeek 5 жыл бұрын
Thanks. :-)
@danieldm2549
@danieldm2549 3 жыл бұрын
@@HeatingGeek Great videos, I've become a fan particularly as I've got an issue with my Turbomax Plus 828/2E. With the flow sensor I see you can only appear to be able to buy the 'magnet' end' My other end (the pcb end) appears to be manky and I suspect the connection is causing my intermittent issue. Would I really need to replace the whole board for such a tiny part? It's the pcb side plastic bit that connects to the sensor side that looks corroded. Cheers
@ArksE8
@ArksE8 Жыл бұрын
I remember watching this video. I was hooked after that and told all my buddies about the channel
@HeatingGeek
@HeatingGeek 7 ай бұрын
Thanks :-)
@Stillbusy105
@Stillbusy105 3 ай бұрын
Great video, couldn’t find instructions in Vaillant installation manual so googled it & found to it video, knew it would be a good one as Iv seen your vids before! Top notch stuff’ I’m gonna try impeller kit first Thanks
@HeatingGeek
@HeatingGeek 3 ай бұрын
Glad it helped. Thanks for watching. :-)
@mohammednazar5255
@mohammednazar5255 6 ай бұрын
That was nice . I had same problem after 6 years of this video
@HeatingGeek
@HeatingGeek 6 ай бұрын
Great boilers :-)
@Ex3t3r
@Ex3t3r 5 жыл бұрын
Another fine tutorial. Thank you for taking the time and trouble as I am sure I speak for many others who follow these tutorials with great interest.
@HeatingGeek
@HeatingGeek 5 жыл бұрын
Thanks. Thats my very first video.
@garylawton7254
@garylawton7254 4 жыл бұрын
@@HeatingGeekI only need a multi meter for this very issue so will only use it once would you say the cheap £10 ones on ebay are useless and a waste of money or be OK for the odd repair or is it imperative to use one more expensive and better quality to be sure of the test on the ntcs? Thank you
@HeatingGeek
@HeatingGeek 4 жыл бұрын
@@garylawton7254 I have only ever used Fluke or Testo multimeters so I can't comment on the £10 on ebay.
@garylawton7254
@garylawton7254 4 жыл бұрын
@@HeatingGeek is it as easy as it looks to test the thermistors?
@woodbine66
@woodbine66 6 жыл бұрын
Ecellent - many thanks. More troubleshooting please - especially Vaillant Turbos!
@HeatingGeek
@HeatingGeek 6 жыл бұрын
They don't go wrong enough!!! Blocked plates, a tweek here and there great boilers.
@richierich.1982
@richierich.1982 10 ай бұрын
Great video thank you. The fact there was no signal To the PCB means its the flow sensor as 5V to ground was good. Egg on face check always good to prevent any doubt mind.
@mike004692
@mike004692 4 жыл бұрын
cool , got a Valliant thats droping out and cutting out , think its either the pump or flow sensor , will double check before putting the pump in . many thanks
@HeatingGeek
@HeatingGeek 4 жыл бұрын
You can use status codes to check that. Look it up. :-)
@johnalderweild6442
@johnalderweild6442 5 жыл бұрын
Excellent example in a live situation.
@HeatingGeek
@HeatingGeek 5 жыл бұрын
90% of my stuff is live.
@johnalderweild6442
@johnalderweild6442 5 жыл бұрын
@@HeatingGeek It's being well recieved don't know any other channels that show it live, normally in a training centre with no real life consequences. Top channel learning loads.
@HeatingGeek
@HeatingGeek 5 жыл бұрын
@@johnalderweild6442 Thanks. Its hard getting people to agree to let me film it.
@johnalderweild6442
@johnalderweild6442 5 жыл бұрын
@@HeatingGeek With your looks shouldn't be a problem asking mate 😂
@stewartharrod8562
@stewartharrod8562 4 жыл бұрын
Superb tutorial ' very interesting even if your not in the business Nicely done ' 👌
@HeatingGeek
@HeatingGeek 4 жыл бұрын
Thanks! 😃 What made you watch it? This was my very first upload:-)
@stewartharrod8562
@stewartharrod8562 4 жыл бұрын
@@HeatingGeek I'm a plumber and an electrician and going into do my gas hopefully your a hard worker and a fabulous teacher you deffo got a fan here
@chrisdavies1814
@chrisdavies1814 6 жыл бұрын
trying to diagnose a fault on one of these boilers.. hot water is only warm with full flow if I close tap down does get hotter.. But boiler will eventually start kettling and cut out. works ok in heating. great videos by the way. Thanks
@chrisdavies1814
@chrisdavies1814 6 жыл бұрын
checked dhw hex isn't blocked.. pumps ok. aqua sensor ok.. thermistor ok.
@HeatingGeek
@HeatingGeek 6 жыл бұрын
Burner Pressure is wrong? Or a crazy fault that I have only seen twice before that I cant really explain now. Does it modulate?
@chrisdavies1814
@chrisdavies1814 6 жыл бұрын
gonna go back to the job today after my Son goes home.. run out of time yesterday.. was looking in Mi at burner pressure 10.8mbar and 1.8mbar on min? other than that, all I can think of is primary heat exchanger partially bloked. thanks for reply.
@HeatingGeek
@HeatingGeek 6 жыл бұрын
Did it modulate?
@chrisdavies1814
@chrisdavies1814 6 жыл бұрын
I don't think so as water got hotter if I closed down the tap half way? . to be honest I didn't think to check, but will check later.. sorry I'm new to break downs. I'm guessing that's why it could be over heating as it's not modulating.
@Dimpyz
@Dimpyz 5 жыл бұрын
Thanks for this. Steering me to the impeller did the trick just when I was thinking motherboard.
@HeatingGeek
@HeatingGeek 5 жыл бұрын
Glad you got it sorted. :-)
@macpatel7810
@macpatel7810 6 жыл бұрын
Good troubleshooting tips and explanation..
@HeatingGeek
@HeatingGeek 6 жыл бұрын
Thanks
@BabyRevealParty
@BabyRevealParty 5 жыл бұрын
Another great video !! ...Is this on all Valliant boilers and also is it common on other boilers?
@HeatingGeek
@HeatingGeek 5 жыл бұрын
This is the same on nearly all 3 wire sensors. :-)
@k956upg
@k956upg 5 жыл бұрын
I have changed literally one of these vaillant tmax+ flow sensors in about 15 years & I see them 2-3 times a week... Thanks for the vid though.ill watch for the diverter vid as I can never remember which 24vdc is what wires.
@HeatingGeek
@HeatingGeek 5 жыл бұрын
I think you will start to replace these more often. The plastic impeller starts to fail now.
@HeatingGeek
@HeatingGeek 5 жыл бұрын
kzfaq.info/get/bejne/gZaogb2By9e1XYE.html Check out this video for the madest Turbomax Plus Fault.
@daddy2244
@daddy2244 Жыл бұрын
Thanks
@mimo1dz38
@mimo1dz38 5 жыл бұрын
Nice one as always. I dont f....g understand people dislike this infos some people it cost money.
@HeatingGeek
@HeatingGeek 5 жыл бұрын
Thanks. :-)
@mimo1dz38
@mimo1dz38 5 жыл бұрын
Sorry for my english mate was writing it on wolking
@HeatingGeek
@HeatingGeek 5 жыл бұрын
@@mimo1dz38 Don't worry about it! My english is very bad too.
@antonynr
@antonynr 3 жыл бұрын
Thanks! Mine was showing 4.6V regardless (After taking out impeller to check it was spinning freely) , so Hall Sensor is blown - just the sort of information that should be in the servicing manual - but missing!!
@HeatingGeek
@HeatingGeek 3 жыл бұрын
I hope you have it sorted by n ow. :-)
@MrMikehope
@MrMikehope 9 ай бұрын
Have have the same 4.8v, across black and red, and 4.8v accross black and green??? Whay does this mean??
@HeatingGeek
@HeatingGeek 9 ай бұрын
If your getting this with the tap running then the sensor is jammed and needs replacing.
@robhawkins2492
@robhawkins2492 6 жыл бұрын
Good Info Mate. I don't do many Vaillants. Good to know.
@HeatingGeek
@HeatingGeek 6 жыл бұрын
They are all the same really. Thanks for commenting.
@annielewisme
@annielewisme Жыл бұрын
I think the flow turbine pulse speee depend on the speed of the water flow through the impeller. which will be 5 volts. Your meter is averaging the 0v and 5 volts and shows about 2.5v
@HeatingGeek
@HeatingGeek Жыл бұрын
You are absolutely correct :-)
@ljames85jr
@ljames85jr Жыл бұрын
So I'm getting heating fine but hot water is cycling on off every 1-2 seconds. I get 12v red and black and with no demand get 5v black and signal wire. With demand exactly the same readings. Different boiler to you and we have just come back from 2 weeks away so it's a strange one.
@Carl-re6zb
@Carl-re6zb 6 жыл бұрын
Nice vid mate.. Another way I guess, would be to check the continuity of each cable in the harness after detecting the lack of power back to the board Which if ok should definitely point to a faulty flow restrictor..
@HeatingGeek
@HeatingGeek 6 жыл бұрын
That would work on some boilers. The Baxi duoTec (for instance) has no power during a demand but constant power at rest. See the other video I done. I was surprised myself.
@mohammednazar5255
@mohammednazar5255 6 ай бұрын
Hi I did change the both impeller and sensor. Had same voltage on both sides. No hot water. Any tips. Please
@HeatingGeek
@HeatingGeek 6 ай бұрын
Is it a turbomax plus?
@dzmalekvali1110
@dzmalekvali1110 3 жыл бұрын
THANKS boss
@sunray6648
@sunray6648 6 жыл бұрын
Thank u
@HeatingGeek
@HeatingGeek 6 жыл бұрын
thank you for watching it.
@joeblogs2102
@joeblogs2102 4 жыл бұрын
THANK YOU !
@HeatingGeek
@HeatingGeek 4 жыл бұрын
It's all easy once you know. :-)
@igipop9131
@igipop9131 5 жыл бұрын
Thank you very much
@HeatingGeek
@HeatingGeek 5 жыл бұрын
No problem.
@leaturk11
@leaturk11 5 жыл бұрын
nice job
@HeatingGeek
@HeatingGeek 5 жыл бұрын
Thanks :-)
@leeedwards3783
@leeedwards3783 5 жыл бұрын
Hi. Thanks for the video. I went to a Worcester green star junior where the boiler fires up for hot water but doesn't get hot and so the boiler over heats. Thinking the diverter valve as the sensor is calling the boiler to fire. To be honest, I rarely do maintenance on boilers. Cheers
@HeatingGeek
@HeatingGeek 5 жыл бұрын
The diverter just comes out with 2 screws so very easy to check. I have never replaced one tbh. if it overheats it probably blocked up. Thanks for watch\ing. :-)
@juangalofre4735
@juangalofre4735 6 жыл бұрын
It is more probable that when the test fails it is because the turbine-magnet inside the inlet tube is broken, and the magnet inside does not rotate with the water flow. To test the sensor connect it to a 5v power supply and move a magnet close to the sensor changing alternatively N-S. If the signal cable changes slternatively from 0 to 5v then the densor is ok and the turbine inside has detached from the magnet disk
@HeatingGeek
@HeatingGeek 6 жыл бұрын
The usual failure mode is the plastic turbine cracks and fouls on the brass housing. Therefore not turning. I test these by substitution of the sensor. Takes less than 30seconds to test. The video is more about the working principles of the unit and can be used on multiple boilers with similar sensors.
@goforit367
@goforit367 5 жыл бұрын
@@HeatingGeek top man!!!!! big fun Soti
@HeatingGeek
@HeatingGeek 5 жыл бұрын
@@goforit367 Thanks. :-) This is my first ever video. :-)
@mimo1dz38
@mimo1dz38 5 жыл бұрын
HeatingGeek mate. would be the same way to tes ideal indepandent c30 switch. HW ok but no CH. I am not sure i think the swich comes with two wires only.
@HeatingGeek
@HeatingGeek 5 жыл бұрын
If its 2 wire its a switch. If its 3 wire its a sensor. The independent is a sensor (3 wire) I think. Unless its like a Isar which uses an NTC to tell if the hot water is running.
@mimo1dz38
@mimo1dz38 5 жыл бұрын
Many thanks mate
@Flashbang_Photo
@Flashbang_Photo 6 жыл бұрын
I have a Saunier Duval which flow sensor is a frequency generator, and seems that my (always low) water pressure gets even lower on summer, and the sanitary water now doesn't run at all. It gets around 10 and 15Hz, an i didn't got it running with the oscilloscope attached to it. How can i do at least a bypass on this? I'm afraid about buying a new flow sensor ($60) and being at the same point
@oliviergilcreest8088
@oliviergilcreest8088 6 жыл бұрын
They all produce a frequency (hz) but they have to produce a high enough one for your multimeter/Boiler to pick it up. 10-15hz isn’t going to be enough. What Saunier Duval do you have?
@Flashbang_Photo
@Flashbang_Photo 6 жыл бұрын
Thanks for replying! It's a Saunier Duval Thematek S F 24 E, which has got a LOT of problems with the house heating system, and seems than it could be the water of the city (the say our water is a boiler killer) because now the flow sensor goes slow. I know here we have a very low pressure and flow, but i guess that the minimum 1L/minute is reached by far.
@HeatingGeek
@HeatingGeek 6 жыл бұрын
Measure the voltage. It should be just like this vaillant one. I think the flow sensor in that boiler is the same as the glowworm flexicom and vaillant ecotec. Therefore it is tested the same as this one in the video.
@Flashbang_Photo
@Flashbang_Photo 6 жыл бұрын
As i seen, the boiler itself converts the logic voltage to 17-18 volts, and even the gas system works at 24 volts. I looked the voltage at the out and with a tester hovers around 7-8 volts, so i assume is a hall sensor like ones found in some cars for its digital speedometer. Looking with an oscilloscope at the signal pin, it gets the full voltage and the 0v, with a regular patern that suggests me the coil and magnet is in good shape, and the freq is between 9hz and like 15-18hz. If i just let the pressure accumulate with closed taps, the peak flow spins the sensor to 30hz just for half a second when i open one of them, but again, i know the flow is weak here, but it should get the liter per minute (i'm likely going to test with a bottle)
@Flashbang_Photo
@Flashbang_Photo 6 жыл бұрын
Okay, i just got a 2 liter bottle filled with around 1.8L-1.9L of "hot" water in 29 seconds.
@thattrader6486
@thattrader6486 Жыл бұрын
What if I’m getting 4V live and also 4V signal? Not registering demand for HW
@HeatingGeek
@HeatingGeek Жыл бұрын
Then it has no signal.
@thattrader6486
@thattrader6486 Жыл бұрын
Bloody sparky put 230 to 24 contact 🔥
@MrMikehope
@MrMikehope 9 ай бұрын
​@HeatingGeek what should he do?
@guyp3599
@guyp3599 3 жыл бұрын
Hi HeatingGeek, hope you can help. I've got a Vaillant Ecotech Plus 624 and even though we have hot water, there's no hot water icon on the display and thus, we can't change the temperature. Vaillant themselves said this is because of a communication issue between the tank and the boiler (or a PCB fault) Any ideas how to rectify this please? Thanks in advance.
@HeatingGeek
@HeatingGeek 3 жыл бұрын
Unless you have a Vaillant Hot water cylinder and an Ebus control system the hot water knob doesn't do anything on your boiler.
@guyp3599
@guyp3599 3 жыл бұрын
@@HeatingGeek Thanks so much mate. Someone else told me that too, so I've just upped the temp of the whole system, which should hopefully make the hot water a bit hotter. 68 degrees ok?
@HeatingGeek
@HeatingGeek 3 жыл бұрын
@@guyp3599 Should be ok. You will also have a cylinder stat on the HW Cylinder. That controls the hw temperature.
@Mad4plumbing-ltd
@Mad4plumbing-ltd 3 жыл бұрын
👍
@cfgman9176
@cfgman9176 6 жыл бұрын
Good explanation m8
@HeatingGeek
@HeatingGeek 6 жыл бұрын
Glad it helps.
@izzzzzz6
@izzzzzz6 Жыл бұрын
Quality
@HeatingGeek
@HeatingGeek Жыл бұрын
Glad these videos still help people
@izzzzzz6
@izzzzzz6 Жыл бұрын
@@HeatingGeek I thought my flow sensor was shot but it was fine. I hooked it up to my power supply and to my sink. then by using the multi-meter on diode mode i could hear the sensor working as it triggered the beep accelerating as i increased the flow. I was going to buy a new one with the stainless spring clips (for an old bosch) as one clip was broken. You can only buy the clips with the sensor (around £80). I fixed the clip by wrapping copper wire around it then soldering the wire to make it ridged. Works a treat. Now i just need to go track down the guy that ripped me off.
@SUPERSPARKYSEARS
@SUPERSPARKYSEARS 4 жыл бұрын
Thanks, really great video. I have an issue with my valliant boiler Turbomax. Hot water is intermittent. The sensor has 4.6 vdc red to black all the time and also has that black to green as well. I took the impelar out which looked slightly warn. Any thoughts ? Thanks again.
@HeatingGeek
@HeatingGeek 4 жыл бұрын
Usually, the impeller veins start to come apart and catch in the housing. If that's not the issue then the sensor must be faulty. You cant buy it separately as far as I know. If you can send me the link. :-)
@SUPERSPARKYSEARS
@SUPERSPARKYSEARS 4 жыл бұрын
@@HeatingGeek thanks for a quick reply! I'm an electrician and haven't got a clue with boilers. I've managed to find a impeller on eBay for £7.99 and a sensor on Amazon which are coming next week so fingers crossed! Thanks again, Paul
@HeatingGeek
@HeatingGeek 4 жыл бұрын
@@SUPERSPARKYSEARS Cool. Good luck and let me know how you get on. :-)
@SUPERSPARKYSEARS
@SUPERSPARKYSEARS 4 жыл бұрын
@@HeatingGeek just thought I'd let you know your advice worked. The impeller came , I fitted it and now don't have any boiler problems. Thanks
@HeatingGeek
@HeatingGeek 4 жыл бұрын
@@SUPERSPARKYSEARS Nice one. Was the old one catching on the housing?
@seychelles44
@seychelles44 5 жыл бұрын
could you not check the resistance of the sensor before changing it?
@HeatingGeek
@HeatingGeek 5 жыл бұрын
Its usually the mechanical part. Resistance docent tell you very much on these. Once you change the brass bit you can keep the sensor and quickly check in future.
@mathewfury448
@mathewfury448 6 жыл бұрын
Hey man. Did you change the body or the plastic turbine?
@HeatingGeek
@HeatingGeek 6 жыл бұрын
I changed the whole thing. However if you can get the turbine do that. Its much cheaper and takes 2 min instead of 30. Put the part number up its you can :-)
@johnburns4017
@johnburns4017 4 жыл бұрын
What electronic part did you change?
@HeatingGeek
@HeatingGeek 4 жыл бұрын
The clip-in hall sensor. You cant buy it separately but it takes seconds to do.
@georgesanders4017
@georgesanders4017 5 жыл бұрын
Hi mate. Had this very same problem today. Could you tell me the names of the parts that you changed please ? Many Thanks!
@HeatingGeek
@HeatingGeek 5 жыл бұрын
Aqua sensor. Thanks for watching :-)
@georgesanders4017
@georgesanders4017 5 жыл бұрын
@@HeatingGeek Thank you very much. Excellent video as always! Great use to a still relatively new engineer : ) Very thorough ans well explained.
@HeatingGeek
@HeatingGeek 5 жыл бұрын
@@georgesanders4017 Glad it helps. It was my very first video. ;-)
@amxltd8718
@amxltd8718 4 жыл бұрын
👍👍👍
@HeatingGeek
@HeatingGeek 4 жыл бұрын
Thanks ;-) This was my first ever upload. :-)
@miffa123
@miffa123 4 жыл бұрын
Ive read the impellor gets clogged in these, I think this is my problem at the moment as it's intermittent and as soon as I unclip the flow sensor wire from the brass aqua sensor and plug it back in it works.... I can't seem to get the impellor out though so ive ordered a new aqua sensor to be on the safe side.. any ideas on how to get the impellor out?or is that even my problem given that it's working when the wire is taken out and put back in?
@HeatingGeek
@HeatingGeek 4 жыл бұрын
To get the impeller out you have to take out the circlip. Usually, a vein has come out and is stoping the impeller turning. This won't be fixed by unplugging the hall sensor though. Bit of a weird one.
@miffa123
@miffa123 4 жыл бұрын
I'll make sure to update once I've found the solution to this in case anyone stumbles upon this post with a similar issue in the future
@miffa123
@miffa123 4 жыл бұрын
My suspicion is the wire/sensor itself is the issue so will replace the wire first to see if that sorts it
@HeatingGeek
@HeatingGeek 4 жыл бұрын
@@miffa123 Easy to replace:-)
@HeatingGeek
@HeatingGeek 4 жыл бұрын
@@miffa123 Nice one. Thanks :-)
@drewgriffiths3748
@drewgriffiths3748 5 жыл бұрын
Mine has 4.6v on the green all the time - why is that? When isolated then goes to zero.
@HeatingGeek
@HeatingGeek 5 жыл бұрын
Its not working??
@gjmheating8857
@gjmheating8857 3 жыл бұрын
Can you just change impeller
@HeatingGeek
@HeatingGeek 3 жыл бұрын
Yes.
@manjsingh6500
@manjsingh6500 3 жыл бұрын
😊👍👍
@nikikonomi4472
@nikikonomi4472 3 жыл бұрын
👍👍👍👍👍👍👍👍👍👍👍👍
@dzmalekvali1110
@dzmalekvali1110 5 жыл бұрын
Thanks
@HeatingGeek
@HeatingGeek 5 жыл бұрын
No problem. Hope it helps. :-)
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