There are three pumps, when you turned on the furnace you got the other pumps running. If you don't have the furnace on, the system ONLY uses the one summer loop pump for hot water. As stated, simple test, flip the rocker switch on the box and see if you have hot water.
If you determine its the pump, I would buy two and have a spare.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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