David Wells, thank you a lot for this video... It happens this week-end, I have not emergency number at hand, anyway, my understanding of English spoken is not great, yet, and even for Scotland, right now, the weather currently is pretty cold, 12 degres Celsius, 53 Farenheit today so again, thank you from my cats and me...
You need underfloor heating to can reduce flow temperature . And you need decrease your heat load also . In other way you can’t reduce flow temperature , because will be cold in your house .
Not at all, most radiators are over sized in the UK, due to better insulation since the advent of heating in the 70s My home runs rads at a 40c flow temp and my wife like a steady 23c
@@davewellsheatingengineer But the Heat Load ( heat loss ) will setup the flow temperature . With oversized radiator you can reduce the flow temperature , of course , but in the end the heat loss it’s the most important factor .
@luk5827 running at a lower temperature keeps the boiler running in its most efficient mode (condensing) it also increases reliability, we see it on every service, expansion vessels don't loose pre charge, combustion chamber clean, AAvs not crusty or leaking.. I could go on. Running where possible (dependant on property heat loss and emmiter outputs permitting) is without question a far better way to use a heating system
@@davewellsheatingengineer I’m agree 100% with you ! The target it’s to run the boiler as lower flow temperature as possible . But this depends of house heat loss value , depends of heated surface of house , outside temperature , inside desired temperature , settings of gas boiler ( maximal power of gas boiler need to be limited from parameter settings ) , gas boiler modulation range and so on . With radiant heating ( underfloor heating ) and a Passive House you can have a really low flow temperature .
Hi I will see if I can upload tomorrow. Should point out that the air control is very very minimal, makes very little difference, unlike a standard pressure jet boiler
Hi, I have a valiant eco tech that keep coming up with water pressure fault. British Gas have been 3 times First time they replaced the inverter valve as it was leaking but this didn’t solve the problem, 3 weeks later I called them again and they replaced the pressure sensor and few weeks later had the same problem so I called them again, they came and changed the pressure settings so i don’t have the f75 fault but again few weeks later the issue reappeared. No visible water leaks around the house or any damp patches etc. What else could it be ? Appreciate your help 😃
Hi I assume your boiler is losing pressure (or at least the display is saying it is) Does your boiler have a pressure guage on the front? If it does does it read approximately the same? F75 pressure can not be adjusted, it is what it is.. The causes of F75 are leaking pipes, radiator valves and joints, it doesn't have to be much to reduce the pressure low enough for the boiler to go to fault to protect itself. Check all your radiator valves for any signs of leakage, this doesn't have to be wet but sometimes shows a crusting around the valve. It can also be a leaking Auto air vent in the boiler. It can also be a pump inside the boiler starting to fail. The boiler needs to see that it had enough pressure in it before it does anything, if not you will get f75. If it says there is enough pressure it will then operate the pump, the pump should generate an additional .3 of a bar pressure, if it doesn't it will fault to f75. Get a good vaillant specialist or call Vaillant (or me if I'm in your area lol) Best wishes
Thanks so much for sharing this. Super clear video. Woke up this morning with no hot water and no heating and feared the worst. Watched your video and all fixed! Awesome - thanks!!
Our boiler is a ecotec plus and it doesn't have those white valves underneath the boiler, instead what we have is a filling loop upstairs next to the immersion heater. An engineer installed it and taught me how to do it, I've done it many times before but this time it's not doing anything when I turn the screw on the filling loop metal pipe. Any ideas why it's not working this time?
my vaillant eco tech pro 236/5 from 1.3 bar cold rise to 2 bar when heating is on.Do i have to leak a radiator to reduce pressure or is it ok? The boiler heats 9 radiatos for about 110square house.
1.3 rising to 2bar isn't awful. I would leave it at that but get a heating engineer in when you can to check the expansion vessel pre charge and also if the system needs an additional expansion vessel (all depends on volume of the system but a good engineer will work this out )
Brilliant video, easy to understand and just the essentials. My neighbour had this emergency at 6am, she was freezing cold and needed to go to work, I was not familiar with her boiler but you helped me fix it in minutes ! And saved her calling out an engineer, additional days being cold and the cost. I've taught her what to do in future too ! Thanks so much !
sounds like someone has removed them, you can buy them, but for safety probably best to call a heating engineer to pop a couple on for you@@Marinda2610
Yes the sustain will have a separate filling loop, usually a braided flexible pipe near the boiler with valves either end. The principal is the same though
Had this issue and read the manual which made it seem very complicated! Your video really simplified this and helped sort the issue and get hot water back, thank you!
Don’t know if you can help David,but twice now my boiler has failed to come on,but the strangest thing is that no water comes out of my hot tap (even cold water)not even a drip,have you come across this problem before?.Then all of a sudden i have water coming from the hot tap and the boiler works without doing anything to it after maybe one or two hours.We have very low water pressure in the the water main outside 1.6 bar to my water meter in my driveway.Could it be that if there’s a problem (like a water leak)and the mains pressure drops below the required pressure this would stop the boiler operating.It’s very strange especially the fact that no water either hot or cold comes out of the hot tap.Have you come across this problem before.
I assume this is just the hot taps, if so one of the valves I show in the video is on the on position, it will be the righthand valve make sure it is turned to the off position
@@davewellsheatingengineer It’s not the refill pipe that is the problem,the problem is that when the boiler doesn’t work,no water goes through it to the hot taps not even a drip all my hot taps in my house are completely dry.I think it might be because of the pressure in the water main as after a while 1 or 2 hours water appears at the taps and the boiler works.Maybe because the pressure has gone up in the water mains.I have spoken with the guy who services the boiler and he’s not sure.Would the water pressure to the boiler cause this?
@@stephenwright2056 the refill valve on the right is a diverter, it diverts water from the main supply that usually goes through your boiler to filling topping the pressure up, it is very likely this valve has either developed a fault or been left in the on position. Incoming water pressure would affect hot and cold.. yours is just hot
@@davewellsheatingengineer Them valves haven’t been touched they are in the off position.They are not the problem,the boiler simply doesn’t turn on and no water (and being the boiler isn’t on it would be cold )is in the hot taps no drips or any water at all.Then a bit later (this time 1 or 2 hours) the boiler starts up.I think it’s the water pressure from the cold water main that’s got reduced pressure and that pressure isn’t enough for the boiler.I have 1.6 bar at my water meter,i suspect that the water pressure is reduced possibly because of a leak or reduced pressure from down the pipeline.Because even if the boiler doesn’t work i should still get cold water through the hot taps.Thanks for your interest.Do you know if the water pressure isn’t enough would i still get cold water through the boiler to the hot taps.
@stephenwright2056 a boiler doesn't need to be on to have water flowing through it to the taps. Ask when did this start May I suggest you go to the boiler, turn the righthand fill valve on and off a few times whilst having a hot tap open
SORTED ... 🤔 So, I think I finally figured out that the CH Scheduling on the boiler takes a kind of "master control". When setting the schedule on the actual boiler, the black markers in the schedule allow the boiler to be on and listen for commands from the thermostats schedule! If there is no small black bar the boiler does not operate or listen to the smart thermostat. When there is a black bar the boiler is listening to the thermostat, so when the room temperature goes lower than the thermostats setting or the override feature is used, the boiler hears the command and fires up. The mobile App is also now connected, it's a little flakey but picks up the internet most of the time now. Even managed to get it to fire up the boiler with the boost function (once the black markers had been set properly on the boiler) 😃
Thanks for the video, CH override did not seem to work. Said it was in override but boiler didnt fire up. Also having issues with the Mobile App - wireless connects but does not connect to the internet, says that the connection is unstable yet the signal is full strength. Seems pretty poor to me. How have you found the smart plus control system?
Hi I have found Smart Plus pretty good apart from initial link up where you can get the unstable message, the truth is there are no hacks, just keep doing it and it will link, once linked we rarely have any issues (so long as the receiver is within range of your WiFi. Also, I find it so much easier linking with android rather than apple, once linked then any device will link on with user name and password.
Suddenly realised the water wasn't heating up, checked the boiler & the pressure was 0.4, didn't know what to do.... Watched your video, it was clear as crystal & just corrected the pressure.... Bobs not my uncle but the water is hot again. Thanks for your wonderful video.
Hello David, Thanks for your video... My LCB 700 rs36, just installed, after setup doesn't stop at the highest fixed temperature, 75°, it stops on 85/87.Moreover, it goes down the minimum, which is 50° of about 10°, starting again at 42°. Any hint? Thanks in advance. Antonio
