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the flow sensor shouldn't flash, but you shouldn't really be inside the boiler, it forms part of the seal for the combustion chamber, which if not sealed correct and the boiler has a issue it can be dangerous.

its highly likely that if the installer would of told you about the risk you would of just told him to get on with it anyway, depending on the amount of pipework involved it could be an extra £1500 for example on top of the job in hand, when i was self employed i did advise my customers of the...

you may need a negative head shower pump? how high is the water level in the tanks from the shower head and where is the pump located? sometimes is easier to raise tank

gas job for a engineer

possibly an easy fix, but will need gas analyser, to check correct co2. rgi needed for this. also seen this on scaled up main heat ex

just to add. the noise only happened first thing in the morning. and can't remember for the life in me what the tech advisor said was the cause.

had a similar issue on a unvented cylinder, the problem was the diaphragm was resonating in the vessel because it was upright like in the picture, the manufactures advised me to mount the vessel in the horizontal position. it doesn't sound like it would make a difference and i don't understand...