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did u put the black cap on the divertor valve pin

as far as i know yes, if you concern get someone in to have a look

yes

yes his right, find out the flowrate of the dhw, measure the cold water temperature and do a gas rate from the gas meter, all that will tell you if your boiler is working as it should.

in that case could be anything, could be heat exchanger, plate to plate h/ex, gas pressure, themister. get someone who knows what there doing

does it happen in all your hot water taps, or just your bath taps

most likely a new system boiler with a cylinder, what is the flow rate of the water, what is the temperature. don't expect to have hot water if you have a flow rate over 15l/m

which programmer have you replaced it with, give me the model of old one and new one

have you taken the clock of the wall yet. at the back of the clock it will tell you what wires are what, for testing purpose you could make it work, find out by taking clock off

use a multimeter or some device that tells you power is going in. or get someone who knows what his doing before you do something unsafe

yes that what i think providing power is going in

clock faulty, get it replaced, sometime behind the clock could be a reset button

get someone out.

i had a similar fault last year, turned out a blockage in pipework near tha coil

most likely boiler is working fine, what the flow rate and what the temp rise

there is no code like e4, checked your pipe outside

is most likely the tap, never seen a combi with an airlock with hot water

as i said get someone who knows what his doing, when was it last service

get someone who knows what his doing, is a very common fault

is this a combi boiler or system boiler. have you got a water cylinder