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I have a Burnham boiler, a SuperStore water tank, a Taco 6 zone relay box, and 3 Taco circulators. 2 zones for baseboards and 1 for the SuperStore. Randomly, the hot water will stop. I have to shut the priority switch off in the relay box so I can get heat in the house. There is a very faint noise coming from the circulator, yet the pipe on the output side is not hot. The circulator is 1 year old. The Aquastat on the water tank is new. I've moved relays around in the relay box too. The thing that stumps me is the only way I can get the hot water to work if I shut power off to the system then flick it back on. Sometimes on the 1st try, sometimes the 2nd try, it will immediately start pushing hot water through. It could work fine for the day, or a week. Don't know where to go from here.