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could be a flow problem. boiler manual available?

did you test with just HW on ?? power to the orange wire terminal??

The small plastic red/blue circle may be able to be removed, and there may a screw underneath this that can be removed and the tap head lifted off.....?

does water run from the top tap after 3 inches or so, or does it stop flowing?

what am I suggesting??!!

yes they should ideally, and in 22mm pipe. and then the pump shortly after the cold feed connection.

LS to sat (Live/common terminal) terminal and switched live (call) temrinal from stat to boiler's LR terminal. As mrgas said, if a neutral is needed from the stat. then use the NS terminal. The combi gives the prog ropom stat it's permanent live (from the LS terminal to the stats...

the installer did not specify this though and without seeing it is not too clear :(

this is absolute nonsense - basically the short peiece of pipe between your vent pipe and cold feed should be 150mm in length MIN. and then after your cold feed the pump should come nearby (so the system is under mostly positive pressure). the vent tee should be before the cold feed tee also...

Graham, it is an easy task for a competent person to check the correct operation of a cylinder thermostat / motorised valve but it is ILLEGAL to work on unvented if you are not trained/qualified to do so! You can replace it if you wish but it is ultimately down to you. Yes the Unvented...

an Unvented cylinder thermostat cannot be picked off a shelf in b & q orordered from Screwfix! They need to be exact replacements, a) ordered from the MFR ideally and B) Installed by a competent unvented installer. It is a real safety issue here.

Corrosion inhibitor only protects against electrolytic corrosion though doesn't it, as you said metals rusting metals, ie steel being rusted. - not against affects of air being drawn down the vent (air getting in) or fresh water constantly getting in (pumping over)???

John - I have drawn water from the drain cock and put in a marmalade jar (cleaned out first though of course)! and put a steel screw in. (longish). is this ok ? do you mean if air gets in, this too will corrode the nail/screw, so you need to make sure the jar is airtight? thanks for your...

thanks for the advice, i will do the test tnight and see (how long should it take the nail to rust or start to rust roughly)?? also, do you mean the mud that has settled at the bottom of the tank (do not allow that to be washed down into the system)?? or the mud that i have disturbed?

good point, i may have done. will this settle down?? or should i still bale out and reresh ? thanks for helping everyone.

John - to be honest, the water was clearer yesterday - i could see the outlet at the bottom, today it seems muddier... maybe when i put my hand in to try and stop the float valve dripping, whilst i was looking i put some dirt from me into the tank!!! :( is this a big problem? the system...

i was only turning off the water to change a ballvalve!! will they charge me, or is it their property? - is it ok for now to just bail the water (to normal level) every day or so to stop the overflow? will this do any harm? one other point: is it normal for the f & e tank water to be...

I believe the newer meter type outside keys are white plastic and 1/4 turn - the key i tried outside my house is a crutch head type, and i turned it (after basiling out a load of clay/mud ... what a joke that was!!! but it kept turning (not really very stiff or anything though) but no joy!!

Have just tried to turn stopcock off in street as indoors was seized up, removed all the mud/clay from the hole, and got key on crutch head, turned many many times but water still not turning off at mains!! does this mean the stopcock head is not engaging and i need to call the water board out...

Battery powered prog room stats require no perm live (just the switched live from the boiler) but non battery powered ones need a neutral (to complete the circuit). the boiler itself will have a perm live (ie as it is a combi it requires this to heat the hot water on demand) and therefore gives...