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Demo model? How was it run? Is the injector/restrictor correct size(is it setup to work on LPG whereas you're using it on NG)

First port of call would be flow switch. Since the boiler doesn't seem to be recognising a demand for water If the boiler were firing then there could possibly be an issue with other components.

Re my earlier post. orange and white wires are found on the mid-pos valve mid position valve wiring. CH turned on White wire to earth/neutral (230v) indicates heating demand to valve Orange wire to earth/neutral (230v) indicates power to pump/boiler

Silicon is not a suitable material to hold a flue outlet together. nor is a flue terminal held together by concrete

230v across both what?? the stat or the on at the boiler?

Gas valve or electrodes GSR engineer

Reattached :? I'd say that needs looking at.

Valliant built there name and reputation on producing sub-standard boilers at a high price and ignoring customers :? I doubt this entirely. Maybe a bored sparky at work :lol:

Also when you test live-neutral you should also test live-earth and neutral-earth this will help eliminate problems with faulty neutrals

Test the boiler/pump live. If you have a mid position valve as you say this is the orange wire. Turn your heating on you should have 240v on the white wire to the valve and also 240v on the orange wire. If you are not getting 240v on orange suspect an issue with the midposition valve

What is the pressure at on the boiler? Cold it should be 1 - 1.5 bar when the system is hot is should be 2 bar or so. If the pressure is continually high i.e 3 bar when hot or cold then you have a passing issue either via the filling loop or another part where the water and heating pass...

Does the pump run?

1-1.5 bar when cold. You need to unscrew the front panel and fold it down. Then the pressure gauge will push in from the back. It's on 2 little clips

What boiler is it?? photo

Highflow 400 plate heat ex they were fun Most things Worcestor were not easy to change. I used to have fun swapping the big cast heatslave water tanks

No they are behind the pump and DHW heat ex and you have to strip a lot out to get to them.

Leaving the preheat function on uses more energy both gas and electric as the boiler fires in order to maintain it's heat. If you have short runs of pipe then it really isn't required however with long runs you may be drawing off more water in order to get the boiler up to temperature. If you...

Is the PRV dripping outside (boiler overflow) sounds like with that pressure increase when heating up there is an issue with the vessel

I presumed you said the knocking was coming from the boiler when you said top condensor tank area (on the m96 this is the recouperator) If it's coming from the pipework and radiators it's likely expansion on the pipework when the system first heats up where a pipe is fitted close to say a...

If the pump is running and the open vent is discharging into the F+E then as stated above the system is pumping over. This could possibly be a result of insufficient head on the pump/pump speed too high or restriction around the cold feed/open vent area or even down to how the system is...