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boiler been working fine, then out of blue the water runs hot, then col, then hot then cold etc which is annoying and dangerous when in shower. also the pressure is right in the red indicating 4 bars Any ideas???

I have a vokera compact 28 which is losing pressure at an alarming rate. It needs topping up at least once a day. No signs of leaks upstairs and have been under the floor downstairs and no leaks found either. bareley lasts 12 hours without topping it up again. very annoying - the water must...