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Diverter......needs changing

If it only happens on hot water i think it is a diverter issue not pump.....do the 2 pins one at back left and one at front both move and make contact before firing? If so i am sure its the DV

As i rub my crystal ball......... sorry, too few details to go on. It is possible it is just a pcb issue....and just as posible something else took the board out. You need a competant engineer to decide....otherwise it's just guess work

I am confused......no information....what boiler? And why is a pump problem a symptom of a bad boiler if it is seperate? Some boilers have integral pump overun some don't so a sweeping statement that the boiler is 'bad' without identifying if it is the boiler that is the problem doesn't help...

nope. Pressure is only generated from outlet of cws to top of hw cylinder......FLOW rates will be higher the lower the tap but not pressure.......check it if you like on your home taps.......

JPC.....nope. Head is the pressure generated by the distance between the cws and the top of the hws.....therefore pressure is only generated by the head.....not by the distance from cws to tap outlet.

Yes but remember that the closer the cws tank is to the hwc then the lower the 'head' and therefore the pressure......should not be a problem if you put it in the garage tho. Either way it is quite a big job

Try the gasafe website and punch in your postcode. Call a few and see

Odd one this. If a meter was fitted then it would have been left with a sealing disc in it and a warning notice attached.......because the fitter would not have known what appliances (i assume) would/may have been attached and a tightness test would need to be carried out. I suggest you...

Just replace it. If it has jamed it will do so again.......30 quid and an hours work....simples

Potterton fsb (floor standing boiler) fits into a 600mm under counter space Can't comment on kw's required too many unknowns. I suggest you use the sedbuk calculator

Yes, call out a gas safe engineer. To change the electrodes you have breached the combustion chamber.....not a good idea unless your competant.

I don't think that is 22mm plastic. I am pretty sure it's black alkethene and will almost certianly be imperial. You need to cut a small peice and take it to pipecenter. They have the universal fittings for it (philmac) but each pipe needs a different sized insert......usually 5/8ths for...

Yes i can diagnose but because of the nature of this boiler it is not diy work and these babies need to be carefully repaired/serviced. Any competant powermax repairer will know instantly what the problem is so get one in and describe what you have posted on here.

Did you say 80btu's??......thats about the heat output of a candle :lol: I assume you meant 80k of btu's or 24kw approx. The circ pipe size shouldn't be an issue at 22mm. Some very large output boilers (suprima 120L for instance) require 28mm or 35mm for the circs just to ensure the heat...

Hi Danny, I beg to differ on charges. You are paying for their knowledge. Thats why they charge as they do. You are lucky enough to have picked up the info on this site. As you yourself said......it's easy once you have done it (and know where/what to look for). I guess that applies to brain...

It is the promax heatstore and nickso it is the replacement for the powermax he.......and it isn't as bad as either the previous 2........ Can't say i am an admirer tho....

Potterton now make a replacement for the 155x.......it can use the same style flue terminals (but not the same flue).....It won't be cheap and you won't find too many admirers on here... And if your 155x tank is leaking then it's caput

Always prefer the largest pipe to rad connections you can get ie15mm. Unless it is particularly intrusive i think you have made the right decision

Not if it has been fitted to a dirty system......the amount of times i have seen 'flushed' systems that have been drained and refilled with fresh water a few times and called 'flushed'....... The pressure switches on these are sensitive but not s~~te, ie they will show E119 at anything below...