For the past 4 weeks my own Combi will deliver a sudden momentary cold blast of cold water while in the shower. Lasts for maybe 1 minute then hot again and good, not fun! Can't figure it out doesn't seem to have loss of gas or water pressure. Not sure if it is through out the house or just this shower. Might check the shower valve but I doubt that is the problem. Clean the boiler with vinegar yearly. Crazy.
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