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Fair enough I will do that, should I go for an exactly equivalent replacement? Also if that doesn't help whats the next thing to look at?

Actually I should mention when I set it to the 2nd or 1st speed settings the motor sometimes makes a buzzing sound as if it is trying to start up but can't, this only happens if it has stopped completely before trying to start, and I will get going eventually. Fastest speed setting does not do...

There was nothing large at least, just little black bits as would probably be expected. Nothing large came out of the ports. Base was clear although a little rusty. It was able to spin fairly freely, and no obvious damage to any parts, but as has been said who knows if it is actually working at...

Just another though, could the pump be undersized? It's a grundfos UPS 15-60 130. Bearing in mind there are 13 rads and a megaflo do you think it's probably correctly sized?

Sorry I forgot to post about that, it didn't look too badly gunged up inside and I tried to give it a clean, hasn't seemed to have any effect though. I should have taken some photos, sorry I didn't think to at the time. I have also now orientated it horizontally, which also has not changed...

Yes it was a new build, they seem reasonably sized based on the room size and insulation and amount of windows, but would only be effective if they actually got up to temp. The kitchen one for instance is a double panel 600x1400mm as the room (approx 5x5m) has a number of floor to ceiling...

Yes the silver screw cap on the pump is pointing upwards, I'll turn it horizontal but it's been this way for 12 years probably. Is there any way to test whether it is working correctly as a new one is rather expensive and I'd rather not go replacing random parts if it's unnecessary? With regards...

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.

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...

That's thanks to my house being a new build:rolleyes:. 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.

I have opened the upstairs trvs up to about one full turn and kept the temp set at 70, this makes no difference and the boiler still only runs for a minute or so. With the lockshields open about 2 turns, it's still no better. With the trvs all open as well it works much better, will run for 5+...

So I've had a play around this morning. With all trvs and lockshields fully open it seems to run for longer,but still quite a big difference between flow and return temps when the boiler cuts out. I turned the temp down to 70⁰c, and balanced the system by opening all the upstairs lockshields by...

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.

It's set to maximum speed (3rd speed setting) and always has been as far as I'm aware. Just out of interest I tried turning it down the the second setting and it just goes off completely, not sure if that should be happening.

I could probably approximate most radiators to be an average of 600x600mm single panel with two much larger double panel radiators in the kitchen and living room. The pump always seems to be running when the boiler fires up so in theory the heated water should be drawn away - whether or not this...

Would you expect the return temp to be similar to the flow temp at the point the boiler turns off?

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. Fair point about the thermostat, I will set it to the temperature I want, to be honest now I think about it there's no point at all turning it to 30 as it's just a standard non...

Sometimes forcing the hot water to come on (by turning its thermostat to max temporarily) can actually sometimes make the boiler run for a bit longer but generally has little effect, so could easily be coincidence to be honest. It's pretty random and there's 3 main cycle patterns I've noticed...

The water comes out clear when I bleed the radiators and the system was apparently powerflushed when the boiler was installed a couple of years back. It is a 22mm pipe up to the header tank, and it does have water in it. Upstairs radiators all get hot (other than the ones with their TRVs turned...

Just to try to explain whats in the pic, the two pipes on the right going upwards with the valve are to flow and return for the megaflo. The boiler flow comes from the left insulated pipe into the pump and goes out to the right. The magnetic filter is installed on the megaflo return. You can...