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Balboa SN error code

Hi all,

Recently purchased a used Great Lakes spa with a Balboa circuit board. When we initally plugged the spa in, it kicked on for just a few seconds, then cut itself off and displayed only the error code SN. After looking around, we decided to replace the high limit and temp sensors but unfortunately we are still getting the same error code. Looking online, I keep finding where it's talking about error code flashing with temp. or just flashing by itself, but ours is just a constant SN error code with nothing else. If you hard wire the spa, it will come on and run no problems, with the jets and all working but still showing SN error and no heat. At this point, unsure of what to do other than call a service tech but looking to see if anyone would be willing to offer some advice. Thanks for all the time and help!

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