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We have just replaced the pump with a new one and the problem still remains which shows that the pump is not the problem. It also appears that it is more likely to be a blockage in the return part of the system. How can this be corrected please?

..As far as I can see, there is not a bypass. Tasks done so far:- • Flushed out radiators. • Flushed out system at least 3 times. • Checked the TVR's. • Done the LS process. • Added another drain off cock and flushed system. • Removed pump, cleaned and re-installed. And still the...

Sorry, but I forgot to ask on how to find out if the pump is fully working please? And is there two pumps, one for the water feed and one for the CH or is it only one to do both?

I have now drained and installed a drain off cock under the downstairs double rad. I then flushed through the system, re-pressurised and then turned it on. And still the downstairs rads struggle to get heat through them! :evil: Today, I turned off all the upstairs rads and turned on...

...which is what I partly diagnosed from the beginning. I haven't ignored yours or anyone's else valued opinion...just questioned them so I can learn from all the knowledge coming my way. I simply was asking why adjust the LS, valves etc when they weren't touched since the install, which...

...and that means what exactly? :?:

This is what I have been querying all along. Nobody has been in to adjust anything..... ...the only person to adjust anything since the installation is me and that is the annual bleed of the radiators and nothing else. No adjustment to the TVRs or LS's....until now of course.

When you say follow, do you mean turn on the heating so the pipes are warm and feel from the boiler to where they are both hot? I will have a look tomorrow. Again, a similar question to one I have already asked....why should I be adjusting a valve, when it hasn't been adjusted ever before...

Sorry......I don't know what a bypass is?

I did the LS process you asked about some weeks ago (see previous replies) and now the whole system takes ages to warm. Which is why the pump has been looked at and now the air lock is the next possibility.

....the story continues......... I have just emptied the boiler and removed the pump for inspection and a clean. All appears to be fully working okay!..... ..and still the system is not working properly. The double rad still takes ages to warm, which perhaps suggests that an air lock is...

Can the pump be disconnected and inspected by me or does it need a Corgi registered engineer to do this as it means that the covers to the boilers need removing please? Also does the electric feed to the boiler need to be switched off please? Does the boiler need draining as well please?

Thank you Barny! Your answer is what I have been asking for sometime now and nobody (until now) has suggested this. I have always thought it may be the pump which is why I was asking why do the LS process, as I thought this would not alter the pumps own output. Surely you only alter the...

I have some cleaner fluid but yet to put it in, just in case I needed to flush the system again. When the system is running properly, I will add it. My next job is to check the pump as this is what I have always felt was the problem, right from the beginning. I will return on inspection...

As good as but some takes ages to get to temp. The whole system takes a long time to get to temp. It wasn't like this before the initial problem of the downstairs rad staying cold, the rads got to temp at the same time and quickly without having the LS set at what they are now.

I have flushed the system right through and flushed each rad individually. I have done the LS process and the rads do get warm but takes ages to do so.

JohnD, i really do appreciate your help :D but can I ask again what are the reasons for doing the LS process please?...that's all I ask....what will it determine please? :wink:

The 3 upstairs rads are off and cold. The double rad (original problem rad) gets hot but not as hot as the rad that doesn't have a TRV. These two downstairs rads are last in the flow. What I am querying what nobody seems to be able to answer is that 'you' are asking me to turn the LS now...