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i have a 8 month old sundance marin spa which shut down and indicators show Sn1 & Sn3. Does anyone know what might have caused this? i have not had any other problems with the tub and leave the temp set on 100. the sn1 indicates heater disabled or tub deactivated and the sn3 indicates the heater is disabled with the main sensor non-functional. just went to check chemicals and found it this way. unable to reset as it just shuts back off. it was running fine 2 days prior and was not indicating any trouble on the display. have been good at changing filters and checking chemicals. probably over checking if i must admit it. help waiting on them to come and look at it however the owner of the dealership is out with a bad back so the not knowing is killing me.