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You will need to relight the pilot first.... Instructions -> http://www.gasaid.co.uk/file_fixes/hdgf8634r2g8e623qxdg7826w7tgd972df7ttf9eqwdfq2dubxtydfg7q2dtf.pdf

They ensure the appliance's products of combustion stay in the appliance and equally ensure a balance of air and pressure can be obtained for accurate combustion. That all depends on the fault developing; every gas burning appliance should be serviced at least every 12 months; and if you get...

Don't do plumbing really; but has the washer been overtightened causing it to distort and thus leak?

Electrodes Has it ever been serviced?

I have no idea what a combination cylinder is... So please enlighten me and I might be able to help. :?

It's only the domestic hot water heat exchanger, not the main heat exchanger ;) When you go down the plumbing merchants; buy yourself a pressure relief valve as well and change that; save you having to drain the appliance again if some crud has got on the seating (Which stops it from closing...

Or; as wilhelm said; faulty wiring in the first place :D

Most "knocking" noises are due to heat expansion in the pipes; sometimes attributed to poor installation; especially if pipes have been wrapped in certain materials that break down over time; they will then rub on the joists as they expand causing an intermittent tapping or knocking sound...

My suggestion would also be a blocked plate heat exchanger... Might be worth you stripping it out and giving it a flush through if you are on a budget at the moment. Otherwise, for the £10 or whatever he was gonna charge you for the thermistors; it's worthwhile. I always carry one of these...

If it is a gravity type system you'll probably find it's a stuck pump; I believe someone mentioned that there is an FAQ on how to spin a pump to get it going; but have not checked myself... So it may be worth you doing that.

Sounds like it could be the motor on the diverter valve not driving the valve to the right position; especially if you say that you can see the flow switch engage... What Vaillant is this on exactly? As diagnosing an unknown model is very difficult especially where I'm sitting :P

Has the pump been installed the right way round? Do you bleed with the pump on or off (You should only bleed with the pump off)...? What setting is the pump's speed currently on and what happens when you reduce the speed; putting a pump that has a 1-3 speed option on 3 will not necessarily...

I would suggest your system needs balancing although it's not an easy task with TRVs, so get someone competent to do it... Either that or the installer has put in a boiler that is too small for the property - But balancing should sort it out in anycase.

A pump running 24/7 will not do any significant damage - But will wear the pump out quicker (Obviously)... What boiler have you got; you'll probably find the fault is associated with an over-run thermostat or timer that will need to be replaced.

The unit is based on a thermal store; but has a boiler inside it; never worked on one personally; but we have a couple on our area that I'm aware of... As Mr Smyth stated; it is simply keeping it's hot water store up to temperature; make sure the leccy backup system is turned off... If your...

Are you sure no other wires have been disconnected, played with or altered? Was this fault present before you changed the hi/lo stats?

You probably have poorly configured pipework which is starting to block - As such; your system is "pumping-over", try turning your pump speed down as a temporary repair; then get your system powerflushed and reconfigured in the airing cupboard by someone that knows what they are looking for.

The valve rests in the hot water position; as such you will have a fault with your clock/cyl stat on first guess.

It depends if you have a 16/22 Mk1 or not... The Mk1 has a mercury vapour phial which when heated expands and allows full gas to the burner. The later models use rectification; ensure the spark electrode is sitting in the flame and that it's surface is clean of corrosion along with the...

Yes there is... Direct from the operation chart: Even with the smallest amount of flow; the appliance "could" still fire for a short period. Like I said - It was a long-shot; but it's worth it if the heateam guy had neglected it. My thinking is along the lines that maybe there is enough...