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Prestige TriangleTube Water Heater crazy humming noise - timer setting?
Hi. I have a Prestige TriangleTube tankless water heater connected to a water storage tank and radiant heat. Every day a 5.10am something crazy turns on and it makes a super loud humming noise for 10 minutes before it switches off again. Its so loud we can hear it two floors up....its driving us crazy! It seems like it's not the heater itself but something in or going into the tank. I'd love any suggestions on how we could fix it - we had a plumber come out but he said he didn't understand why we had a storage tank and he couldn't help! But even without fixing the humming issue, does anyone know how we could change the timing of the noise? Its the exact same time every day and that time changed when the clocks did but I can't find any timer settings for anything on the Prestige that would cause that. Any ideas of how this might be being set? We have nest controls for the heat but nothing in those settings co-incide and we haven't used the heat at all recently so it doesn't seem to be linked to that. Any ideas welcome!