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KevPlumb - Is that the same as the HDW switch/valve?

No when i turn the mains off the pressure remains as it was until i drain the system again...??

Kevplumb - Secondary heat exchanger?? is that expensive? xr4x4 - Filling loop is turned off yes..

Hi - im new to the forum but hoping someone can help? I have an Ariston MicroCombi boiler and for some reason i have water passing through the system, i spoke to a few people and they said to change the filling loop, i changed this and it didnt resolve the issue, still had water coming through...