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My understanding of the regs are if it is removed it should be replaced with a condenser unless you have enough points to exempt it.And this applies to relocating boiler in same room you will also need gwn or building ispector approval.

I fitted one to a 18 year old vaillant the other month so they are probably telling porkies.Try vaillant direct or do a search on the net.Normally they say you need a new boiler and try to flog you one with a service ageement.

If you have already changed the gas valve it is unlikely to be faulty as well though not impossible. I had a similar problem and like you changed the gas valve no change, so opted for the pcb which cured the fault as the land/lord has a few compacts i kept the valve for spare I think from...

Apologies getting boilers mixed i am wondering if the c/h thermister is faulty it will affect the b/p by modulating the gas valve down .Try checking that otherwise it has to be a pcb fault a faulty c/h thermister could affect the dhw as it regulates the heat in the primary h/exch

I think if you disconnect the modu reg two wires at the front of the gas valve it should fire at full rate if not it is the pcb as was the case on a 100e i worked on what is the flow rate when you reduce it to get 60degs you will only get a 35deg rise at 8/9litres it will drop as flow is...

Would lean towards the p.c.b ,if you change it adjust the ign. rate,also when you reduce the flow trough the taps what is the flow s/be about 8/9litres.If the plate is blocked the gas will modulate down.On c/h can you adjust b/p to 14mb if you can and plates not blocked prob. pcb

Yes and it was the p.c.b in my case.Other possibilities are d.h.w thermistor faulty,gas working pressure low,maybe a blocked d.h.w h/exch.

Spot on oilski the system is bottom not top and i will wager f14 comes up as i said before that is a code for blocked h/exch.Sorry for misleading when i said the sytem was top side.What area are you in because the glow=worm engineer sounds like a complete waste of space, ask for a second opinion...

I cant see how its the pump if the c/h is okay, it will do the same on both circuits unless the dhw h/exch is blocked system side. if the syst pressure is not rising that rules out a perforated h/exch. The water comes in through a flow sensor then into the h/exch and out to a tap if you have...

the h/exch will only go in one way as the fixing points are off-set the top always has the writing on it, as agile said what colour is the debris another thought are any taps/shower heads being blocked as they will be mains fed on the cold side

just remembered the dhw inlet should have a flow restrictor/filter fitted at the isolation valve. Thus eliminating any debris coming into the boiler via the mains. Surely as it is in warranty glow-worm checked this and or took a sample for analysis. p.s if the boiler when fired at full rate is...

you have been mis-informed the debris will be in the system side of the dhw exch. Which i think from memory is the top, possibly the l/h side will be more blocked as this is the outlet side.The bottom holes will be clear as this is mains water. It cannot have been flushed correctly to have...

building regs require a room stat fitted unless enough points acrued a condenser must be fitted he sounds like a cowboy tell him to do one and get , ooops just read your in sweaty land dont think the regs apply to you yet hope you support england in the world cup if not you can do one to.

As a guess i would say diaphram on divertor valve. Can be checked if pin on divertor valve is making micro switch, only a guess with info provided

The boiler is Italian made by Herrmann bought by glow-worm . And is really a cheap boiler for the rental market it could be the cvi unit as mentioned ,or the the flame sensing lead not rectifying properly. I have had several of these in the past a continuity test would not show a fault [the...

very basic boiler cheap version of xi range ali heat exchanger no off/on switch but does have rear flue option only been out since april so had no feed back about problems yet

it could be the burner they are water cooled and do leak causing noises

Sounds like it is blocked it will probably have to be replaced as it is a safety device.Had one the other month which was stuck in the on position the system had a leak when the boiler fired it burnt out as it had dry fired.It should be checked during the service it is a common fault normally...

As i mentioned previousley it is the same flue adaptor as the glow-worm XI range. They have now changed the seal and adaptor depending on age you may get it replaced on warranty as it is a known boiler fault.Also they usually fit a low water pressure switch at the same time.

The digital timer does not hold if the power goes off contrary to the manual glow-woprm know this problem but have done nothing to rectify it fitting a new one will not cure the problem get a refund and fit an external programmer