I was wondering if there were any experienced people on here nice enough to help me with a question in regard to my heater. I turned it on for the first time this year to get the hot tub fired up. About an hour into heating, I noticed the temperature stopped going up. I checked the display on the unit and it was displaying the service code "ext sw 1".
Google tells me I might be able to reset some manual switch, but I have no idea where to find it. Can anyone please point me in the right direction?