That's what I though, I'll have another play around tomorrow. Could be a dodgy switch, which could mean it's actually only running at the first speed setting? But it is running when it should be.The pump goes off? No, that shouldn't be happening. A pointer or red herring though? I'd struggle to assume it's not the former...
I'll try turning it down tomorrow and see if that has any effect. The maximum temp it can be set to is 85 by the way.
Why would the boiler being oversized be a problem? Is it not able to regulate its output according to what is needed? I assumed the installers would choose the correct size.
stop messing with the pump, set it at max and leave it set at thatI've had another look at the pump, it is definitely set to max speed
That's thanks to my house being a new build. I don't know why they decided to shove it all in such a small area, they've basically put the hot water cylinder on top of a shelf and the pipework shown is underneath this. I'll check the torque as you describe.That pipework's a shambles...the pump should be horizontal for the bearings to self bleed and prevent excess wear. Unscrew the cap and check the torque with a 4mm flat blade driver.
Makes sense...could powerflushing help? Would love to have underfloor heating downstairs but obviously it's not practical as the floors are already laid and we're not looking to replace them. As you say the microbore lengths do vary massively. I think the longest length is to the largest rad in the kitchen, not exactly good design! Could a halfway solution be to add some fairly large extra rads downstairs on 15mm pipe of course?It looks like it's more and more pointing towards a circulation issue. The small bore pipe can furr up too, that and the valves are another pinch point.
Basically the boiler is getting too hot and cuts off, so the flow through the boiler isn't sufficient to remove the heat quickly enough, that looks like a circulation issue - the trouble with that will be finding out what's causing it - restricted pipework, restricted HEX, lazy pump, dodgy TRV's etc
Small bore can be a nightmare when it gets older especially where runs are significantly different lengths, I have it but as it's all buried in the walls it's a huge job to replace. That's why I'm now looking at UFH for downstairs.
sorry but your install is a totall disgrace, if anyone working for me thought that was acceptable they would be shown the door
Not gonna disagree with that, it was done about 12 years ago when the house was built (although I haven't lived here that long) but obviously nothing can really be done about it without major work.sorry but your install is a totall disgrace, if anyone working for me thought that was acceptable they would be shown the door
No doesnt need major work, but you should start by rotating the pump 45 degrees so that the large screw is facing you, the pump is not designed to be verical like that , horizontal will be fine, the rest is what it is , not much point in changing it nowNot gonna disagree with that, it was done about 12 years ago when the house was built (although I haven't lived here that long) but obviously nothing can really be done about it without major work.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local