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make sure the filling loop, (the tap you filled it up with) is fully switched off.

when was the last time it was calibrated?? Might be due...should be done once a year.

Pump or fan....

Central heating thermistor??

cause the thermal store is up to temp and the pump is circulating very hot water perhaps??

Easiest way for yourself would be to donate £170 - £200 to British Gas and let one of their engineers come round sort it out. These boilers do have a few things that can cause it but it sounds like it is overheating. could be a thermistor problem, PCB fault, or the gas pressures may be set...

you have pressed the function key during the start up faze and switched from the natural gas to a different setting. when purging at about 20 ses press function and it should step through the different gasses, oils etc you can test.

when you push in the button on the gas valve there is a little switch to tell boiler to start fan and spark! I had one on sat that the switch was not being made hance no ignition sequence. When you push in the button does the fan start??

What setting is the thermostat set on the boiler at?? Which one of the two pumps is running all the time??

If you cant get a heat exchanger for this I'll eat my hat!!! The H/E is a fairly involved job and required various saftey checks being done afterwards so its not reccomended for the DIY man! worcester would do it as a fixed price repair. £200 ish.

Has some internal leak sealer been added to the system?? I always use the salemander range, its NEVER let me down....yet!!! :-D When the system is topped up to 1.5bar then run on CH what does the needle go up to?? Has the saftey relief valve been changed?? Has the pipe going to the...

a link to his post might be nice?? or better still just describe your problem!

BG will be £170 - £200 dependant on your location for a fixed price repair. I would be looking at a dirty pilot light not enveloping the ignition electrode enough. When stripping these out to clean it a 50/50 whether the pilot supply tube will snap...worth left to a proffesional.

you dont happen to have thermostatic rad valves and they are turned down to 2 or 3?? They will turn themselfs off. when the rooms heat up.

Take it back and get a new one then!

agree scatman, hang off those grub screw to get them tight and it will still leak!! Its the small o rings where the spindle passes from the DHW housing to the CH divertor valve that are leaking and can either be replaced as part of a service kit or the whole valve replaced. for the service...

There is a set of thermistors inside this boiler that is a very common part to fail aswell, shown by LED3 on the PCB flashing.

IMHO a blocked main heat exchanger, pump does sound likes its pumping against itself tho therefor is not the problem.

Try BG??

Spot on there!! You should replace the Heat exchgr and fit a magnaclean filter to protect your investment! A flush might also be worthwhile and some inhibitor.