It's supposed to be Sn1, but it looks like a 5. ;-)
Sn1 usually indicates a problem with the High Limit temperature sensor, but it can be caused by other faults such as restricted water flow and I'm assuming that your Coleman has the Balboa controls.
Check the operation of the Circulation pump / Pump 1 and if the water flow is adequate you could try changing the sensor. If however you're unsure about anything, seek professional help.
If you're in the UK I can help with parts and if you're local I can possibly come and check the hot tub for you.
http://hottub.synthasite.com
Kind Regards,
Ian.
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