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get in touch with the waterboard

check all screws are tight on the boiler front, it may be sucking in air if its not sealed properly. also the central heating water doesnt come into contact with the diaphragm on the diverter valve. and a 24i has a flow switch not a diverter i think.

does anyone know if can you get the list of boilers that contain asbestos off the net anywhere or do you have to contact corgi

its probably a safety cut off if the boiler doesnt detect a flame after a certain time while it is trying to light

the header tank ball valve

this is called a lockshield valve and should be opened, a little adjustable spanner will do it

if he cannot find the fault in two hours he has no right to be charging £55 an hour for his services he is obviously **** at his job

vent the pump

if there is no blockage anywhere in tubes or flue nipple and no holes or splits in the tubes and the air pressure switch is new and you havent got the tubes mixed up then it has to be the fan

get to the fan, take the tubes off the fan and wipe a bit of spit on the the metal tube on the fan, if it doesnt suck it in thats ya problem

check your header tank has got water in it

check tubes for splits on both ends and blockages, also fan may be runnung too slow

yes but if the boiler is on all the time the heat would poossibly dry it out, just guessing as its better to check everywhere before ripping floors up

Have you had a look in the combustion chamber on the boilr, the heat exchanger could have a crack in it and leaking from there.

is there a switch on it that says high or low, if u have it on high try it on low and vice versa. if all rads are hot it sounds like it isnt shutting down when it should so possibly a fault with high or low stat. either that or your heat exchanger may be scaled up inside

its probably airlocked, open that valve again, try turning all rads off and opening one at a time to force the air through

i'm not sure, maybe there is a overheat button that needs pushing back in, its like a dark red colour with a button with like a cross on it... I would of thought if it had overheated then it would of took the pilot out with it so you may not find one of these.

also put the heating on by itself and feel the pipe to your cylinder to see if it is getting hot ( it shouldn't be) it may be the pump is labouring and hasnt got the umphh to push the water back upstairs, close the bypass valve for a bit more force

also if the cylinder is unvented you may find an air vent right on the top of it.

try turning the two that are working off also there will be a gate valve on a 15mm pipe that is between the pump and the 3 port valve, this is a bypass valve shut it completly and this should force more water round check your pump is on speed 3. if it works open the bypass again but only two turns.