I have an 18 month old Worcester Bosch boiler, and the mixer bar tap for shower and bath was installed a year ago. This used to happen occasionally, but has been happening more frequently, now involving 30 mins of messing around to get the shower started, and sometimes having to leave the taps in the sink running. I've already increased the boiler pressure, which hasn't made a difference.
I will only be around to deal with this on the morning/afternoon of 24th.
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