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It's just to do with why the pressure has dropped and what I needed to do about it. I've put the red one back on 1.1 bars and I'm going to wait and see what happens over the next few days. From what I've been reading it could be a number of things. I'm hoping it was a one-off fault.

This is my first post so sorry if I've done anything I shouldn't have done! I have a 4 year old Worcester Greenstar Heatslave 12/18 combi boiler (oil fuelled) https://www.worcester-bosch.co.uk/cache/file/59/user-manual-for-greenstar-heatslave.pdf and I noticed a problem with the pressure...