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All new boilers fitted now have to be condensing and the hot water system has to be pumped and properly controlled with a cylinder stat and programmer. (Gravity systems are no longer acceptable) Regards chrisey

You can fit any exposed type suitable for a combi (Mira, Bristan,Deva,etc ) Run the pipes to the chrome inlets in chrome covered copper or stainless, it looks neater, you will need compression couplingsat the top joints. Regards chrisey

You obviously dont know what your talking about. Stick to your carpentry.!!! You cannot repair that joint properly because the housing of the joint is to near to the joist if you look at the picture CLOSELY. The joist as i said needs trimming to give you available room to work to repair the...

It can be slightly diagonal but always best to keep as vertical as possible so the system can vent properly. Air does not rise properly in the horizontal. Regards chrisey

Whats all the stuff on top and around the boiler? It should be REMOVED to allow air flow :roll: Chrisey

Go back to the larger pipework to make your connections, unless you have a manifold. Regards chrisey

Is this a twin or single pipe system, and was the system working ok before the new rad was installed. Have you connected the pump the correct way, and are you sure the pump is working, does the pump get hot and the pipes each side. There could be an air lock. Just some suggestions regards chrisey 8)

Cut the joist slightly wider and deeper to take any pressure off the joint, and wrap it with DENSO TAPE. it will never leak again. youll need some white spirit or meths to clean the joint and to wash your hands in afterwards :lol: :lol: regards chrisey

A few times Dan, when the pipes been hit and broken with the hover. :lol:

Core cutter around pipe in the floor to a couple of inches and chipout loose concrete. clean pipe . use a screw type plastic connector with rubber seals and as an extra precaution some silicone. should be know problem to connect your chrome pipework to. :roll: : chrisey

Have you checked the 3 2 1 rule. Regards chrisey

Could be a faulty filling loop, :o Disconnect, close valve off and check for leakage. also check the boiler vent , maybe a blockage which would also cause pressure increase.regards chrisey.

Hi Tony, It is quite tricky to balance the system and get the correct differential across the rads especially using 15mm throughout the system accept for the index circuit, because you seem to need smaller pipes to give more resistance at certain points in the system, With the old convensional...

jif or diamond paste. chrisey

Hi guys, it always seems to be a bit of a pig trying to get this 20deg temp differential with condensing boilers. On a new install old house how many of you guys are still using the old 15mm copper or are you religously working out your pipework resistance to obtain the correct differential. Or...

Tile first to within 1 tile from the bath rim, fit bath, seal bath to wall with mildew resistant silicone, then cut tiles to bath rim and reseal. PROPER JOB. chrisey :lol:

Thanks guys, for the replys, so used to working on condensing with electronic ignition, that i overlooked the obvious. cheers chrisey.

I suspect the pcb, :( but would be interested to hear any other advise/suggestions as to why the fan keeps running on this combi. cheers chrisey

sorry wrong section