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It will be the spark transformer playing up, the black box below the control box, they are famous for it. make sure you disconnect the power before changing for a new one. Carefully disconnect the black power cable to the transformer and remove it slightly, two electrode leads need to be...

you have air in the system, thats what the noise is, the sream make the boiler cut out, 1. Change the AAV, no other option and they aren't expensive. 2. Check that the DHW circulating pump is working properly, you may hae to replace this as well if the fault has been going on a while. its...

a common cure on this combi is that the plate heat exchanger(PHE) is blocked and needs cleaning. check to see if the hot feed to the PHE is really hot, then check the HW supply pipe from the PHE, the 2 pipes should be of the same temp when the HW is running, if not then you simply remove the...

I recently serviced a combi boiler and found all to be very efficient however the DHW DID NOT HEAT UP HALF AS HOT AS THE SYSTEM RADIATOR TEMP. can I have your thoughts as I have run out of ideas