Either the spa is incorrectly wired or one of the fuses is blown in the spa pack. Typically this is due to your electrician wiring the spa incorrectly and blowing the fuse on accident.
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It sounds like the power surge coming back on damaged the controller. Try disconnecting the mains supply overnight to fully dissipate all voltage in the electronics. It that doesn't work, this is the maker, reach out for support.
Curios, why did you order another control panel? I need some history, when it worked, how it failed, any other information like if it was moved or rewired for power...etc.
'Sn' is a general error message relating to the temperature sensors.
Assuming that you have a Balboa spa pack (M7 version), turn off the power and remove the spa pack cover, you'll find two temperature sensors mounted in the top of the heater tube one at each end. Follow the wiring from the sensor to the plug(s) on the PCB and check that the connections are good, they have a habit of devekoping a poor connection.
If you have a multimeter you could also check the resistance of the two sensors. They should both be the same. If they aren't the same you'll probably have to replace them.
One final thing just to check... Ensure that there are no blockages within the heater. Unless you have service/gate valves you will have to drain the hot tub, unscrew the unions and check inside the heater for debris within the heater assembly.
If you're from the UK I may be able to help regarding parts etc.
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