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I do have an emersion switch, tbh, I thought someone had flicked it on but it's off. The tank is still "running" (making a sound as if it is heating the water) despite being switched off at the timer in the kitchen. Could be this honeywell pressure valve?

Hi All, I've trawled about looking for similar issues to mine but can't quite seem to find the answer. I suspect the motorised valve due to other posts I have read but would like some other opinions please... Problem: Noise coming from hot water tank as if it is in operation despite...