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A non return valve fitted to the heating return (before the tee into the common return) may help your situation. Usually the DHW primary return is the last connection into the common return before the boiler, to reduce the possibility of heat gravitating into the radiators. James.

Get the installer back to put it right. If they will not rectify, I would advise contacting the Gas Safe Register for an inspection. James.

Could be pump, PCB, or fan failure blowing an internal fuse. James.

It would be easier to sketch a rough plan with details and measurements: External wall type, dimensions, insulated? and to what spec. Internal wall type, dimensions, insulation as above. Window dimensions. Floor, you've given some details. etc. etc. James.

Full pedestal & silicone, job done. Next. James.

If it's not enough, slam a myson slimline heater in to make up the shortfall. James.

We know, but it's not just a case of throwing a pump onto the system. If you've got your heart set on using pumps instead of zone valves, you would probably need to install an open bypass for the boiler with the granny site fed by 1 pump and the existing system controlled by another pump. So...

I don't have permission to view the album. James.

There could be a partial blockage. This usually occurs around the air separator. Can sometimes be diagnosed by running a magnet around the pipework and air separator. If it sticks, there is a presence of magnetite. If it doesn't stick, could still be some blockage. Personally I don't bother...

Is that the only price that you've been given? James.

As jeff said, usually the module fails shortly after the guarantee. James.

Professionally I wouldn't use a bib tap with a check valve: a) they should only be used to replace an existing bib tap with check valve (I.e. Should not be used on a new installation). b) you'll have a double check valve fitted upstream of the bib tap anyway. c) I've seen many bib taps with...

That'll please a chap on here that goes by the user name of steelmasons. :D James.

What speed is the pump set at? James.

I've fitted boilers (and expansion vessels) in the past where the vessel has been flat and required charging during installation. James.

Agreed, apologies as it's so easily to get drawn in. James.

Well that's it then, in your opinion, the OP doesn't know what the guy did, so in your way of thinking this thread is pointless. I must have missed where you were explaining the reasoning for calling me a young pup? I've heard of Jim, Jimmy, Jimbo, Jimbob but never Jaz, even amongst my...

How complicated do you want to make it? Change a pump valve to 22mm, hoping that you don't disturb the seal on the other side of the pump and use a 22mm x 28mm reducer below the filter to try and save a few quid? If I was doing what you suggest for a customer, your option would be more...

C'mon Richturd, can you keep up please and answer a couple of straightforward questions? James.

What does that mean Richardthe3rd? Please show me some respect that I deserve by at least spelling my name correctly. I may forget to stop my computer from auto-correcting your name to what Steelmasons and many others on here aptly name you. :wink: What do you mean by young pup? A...