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i've got a worcester bosch highflow cdi floor standing combi. problem is if the domestic hot water is off and water is run, then the pressure in the system falls from 1.5 bars to .5bars when the domestic hot water is switched on the pressure rises back to 1.5 bars. i thought the...

About 3 weeks ago I noticed that my combi pressure was falling to under 1bar when system off. Usually sits about 1.5bars when asleep. I topped it up and began to search for leaks over the next few days, but could not find any, and suspected it was a leak under the floor. The boiler is about 4...