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10 aav's is alot sounds like a air pocket so some would help, has the installer shut the hot rads down to force the air out of the returns for the cooler rads?? Also sound like it needs to be balanced and set up a little better, I would prefer to use Manuel airvents in a roof as once the air is...

For starters what is the problem??? For the need for the aav's in the first place is the boiler locking up or can you hear it all rattling about, cold rads?? Was it powerflushed? 837 in a small bungalow? Sounds oversized! Vails don't like not being able to dump excess heat, has it been range...

Just common practice I use as if it has a new main and the flow rate is at 20ltrs a min at 1.5bar then the water board fix a faulty line and the flow rate and pressure pick up you can get caught out also helps to get equal pressures.

Doubt it's a pcb get a rgi that can fault find correctly, nobody here will answer your question as it's gassafe related and if you have changed part in the chamber you will be willing to have a go at anything! Have you even had somebody out to look at it? Or are you going around the house trying...

22 as far as you can then a pressure reducing valve to control the pressure in to the boiler

Gas fault either needs setting up with fga, gas valves bust, under gassed or spark is goosed get a good rgi to look at it? How old is it? Has it been serviced?

If you can get to it now take it out and fit a endfeed joint and solder it?

It's water hammer, caused by the washer in the valve replace the diaphram washer and it will stop humming

Picasso i was reassuring the op as he has said he dosent know who to believe out of the worcester, bg engineer. Then there all different answers above.

To be fair we are not there so can't jump at the undersized pipe band wagon, fact it's ncs end of glowworm are a prim example will work perfectly at 14mb as some rural areas can only just get this, if it was at risk the worcs engineer should have shut it down, he didn't because he could get sued...

Not a diyers job get a gassafe engineer in to test it before you kill yourself. Leaving combustion case off some people really are stupid!

Problem with halstead I'm sorry to say is it's a boiler that can have various intermitant faults and engineers dont like them for the parts are dear and if you get it wrong cost abit that's why you need a good engineer that can fault find, intermitant faults are are worst enemy IMO as a client...

Sounds more like the ntcs or diverter prob, as said get a second opinion! Halstead are bags though so if you repair it save to get a new unit as main parts on these will chew your wallet quick.

More than likely the timer is faulty, if the boiler fires when you turn it on off by the override, you can take the timer off to do a link test but think you might struggle with how to do it safely. Ask your bro if he has a guy he uses for these probs! May only be a case of fitting a new clock.

Millyput is best to sort it

Ok you have a combi so you are not able to put a pump it as you aren't allowed to pump the mains it's illegal. So either a thrmo shower or a high kw shower with the correct amp fuse, failing that look at the aqualisa digital stuff for mains fed systems. Or to get the best fit a accumulater to...

Mira elite St is a tank fed pumped electric shower, azora is just mains but you should legally have 1 bar min pressure

You may be able to do it if you have a five way click box. Yes the silver box, is it honeywell stamped on it or tower? When you remove the cover there is a screw top and bottom comer to remove the whole head, cut the black cable use the click box to pair the wires back up.

Well to sort this you need to do a long course become qualified and then do a wras approved ticket. Good luck

Change the whole head sounds as if you have a dead board in the head.