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Its probably an E6 meter. There were a dodgy batch of those nationally that all of a sudden seem to go haywire. Notify TRANSCO 0800 111 999 and tell them your problem. They'll tell you to turn off the gas, do not smoke, open all doors etc., standard procedure, don't rely on your gas provider...

one of three things 1. If you haven't got good flow rate from the taps then its your DHW wax capsule thermostat, located on the left of the boiler, with a large hexagonal nut on the bottom of the module. 2. Your flow diaphragm has stretched/torn hence the boiler is not firing on demand...

Just a quick mention, but you say you changed the DHW water section, thats fine, bit you must make sure you throttle the water flow rate down to the recommended manufacturers flow, I think its 8 l/min on the VCW 242. I have had loads of work on these and would consider myself quite...

And finally, continued, your open vent and cold feed pipe want to be before the valve, otherwise there will be nowhere for system expansion. An aerjec, made by Myson are good, as they stop air being induced into the system via the F and E tank. You can pipe straight into these from the boiler...

Firstly, it sounds as though your TRV's are fitted backwards (on the return instead of the flow pipes of the radiators), or if they are dual flow, then you haven't set them up right. The noise is what is known as water hammer, and happens when TRV's are fitted backwards. Secondly, it is ok...

whats happening, or not happening with your boiler? I have all vaillant part numbers to hand

This is definitely a pump problem. Change your pump first.

the pipe going intot the top of the cylinder is airlocked

ch4 + 2o2 = co2 + 2h2o ;-) thankyou very much you rodney

It sounds like the flue is not intact. A common problem is recirculation of products of combustion (fumes) due to a hole in the inner flue, or the flue becoming loose. Instead of fresh air being burned, the boiler is burning co2, hence banging, flame lift from the burner, orange flame picture...

check your safety valve and expansion vessel. The safety valve will be connected to a pipe, which should go to outside and should be visible, normally straight behind the boiler. Check to see if this has been dripping. If the system wasn't commissioned correctly, a bit of muck can stop the...

Your system is pumping over, the sound you can here is because the system is dry, i.e no water. Turn your pump speed down to number 2 on the speed selector on the side of the pump. Also, check your header tank is full of water. Basically, you're system is sucking air in down the open vent...