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If there is no bypass fitted you need to allow one radiator with no trvs and with both lockshields.

go to stelrad.com find a rad that is as close to your dimmensions and that'll be as close as you should need.

the red pop out is the boiler overheat stat. Its a safety device trying to say that something is wrong. If your bleeding air from your boiler constantly then air is getting in. have you increased your pump speed by any chance recently?

modern fanflued boilers go thru a prepurge sequence where the fan will operate first to clear any unburnt gas. this inturn operates the air pressure swith which confirms that the fan is working and then the spark sequence will begin then gas valve will allow gas. It does sound as if the spark...

a combi boiler (now condensing) will rid you of all your tanks, both cylinder and Cold water tanks and your CH feed & expansion. As said before, Combi boilers are "Sealed system" and the system will be under pressure. Your valves may be ok as if your system is roughly ten years old the valves...

because you will valve off the rads. its unlikley that the system will need to be repressurized until you replace the new rads. then as mentioned. reconnect the filling loop and repressurize the system, rembering to vent the air from the rads and repressurizing again until correct system presure...

any ideas where I can obtain a service manual for my m/c. the bearings have gone and i\\\'m gonna try and replace but would like to read up on first.