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Please hold your rating until we get the problem solved, it will most iikely take more than a few tests... meantime please tell me a lot about your technical skills set and ability to use a multi meter.
I need to know about how old the system is and a bit of its history.
we can go from there.
So far it sounds like the open loop pump is not running, or inlet line strainer is clogged, if the open loop pump is not running it could be due to damage to the printed circuit board caused by the power outage.