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Thanks to everyone that helped, managed to sort it at last. I have continually represerising the system while letting air out, replaced to the new pump and now touch wood everything seems fine :)

My Boiler is a Glow Worm 18hxi on the ground floor of the house and I have a Megaflow CL170HE Tank on the second floor. The amount of pipe work in the tank cupboard is pretty confusing to someone whos never worked on a sealed system and is trying to get his head round it for the first time...

Hi and thanks for bareing with me. I have bled the pump, Iv only touched the valves above and below the pump and iv checked these now by opening them with the pump not fitted to check for water. When the boiler fires it makes a clunking sound, the temperature sores and then it shuts off to...

I have worked out where the pressure issue is coming from after bleeding all the rads (very little air and just in the higher ones). The isolation valve above the pump was closed when it should have been open, Opps, should have really checked that first but I used incorrect logic and expected it...

The new pump is fitted the same way as the old pump the only different being the new pump is an EVO whatever that means?!?!. Im only running the system on hot water at the moment and have re pressurised the main tank, should the rest of the system i.e. bleeding the radiators make a difference...

I havnt had hot water for a couple of days and the circulation pump has been sounding a bit ropy and jamming for a few weeks so thinking its because it hasnt pumped enough heated water into the tank I ordered another one (DAB VA65/130) although the new one was an EVO model?!?! anyway fitted it...

Look thanks guys, im glad something positive has come out of this. I really didnt want to dig up the cable and lay another one damaging my newly laid lawn. So before I go ringing a different sparky (Definately not going back to the other one now iv seen your comments) to use the 4mm 3 core he...

tSpark I take it you think it wont be ok LOL. So next question, how can i do this with minimal expense, i really dont want to put another SWA in as it would mean digging up part of my garden

Im laying the cable but not terminating it. But the main reason im posting this is that im now worried about the fact iv burried the wrong cable for him to terminate i.e. a 4mm cable hence why I started the thread. I dont really want to be asking him about the job if he's already got me to spend...

Sorry guys to start another thread on electrics to garage but I have trawled through the existing threads and really just want to clarify a few things before going any further Basically I had a sparky over to quote me for installing electrics to the garage and this was on the pretence I ran...