Mandy Posted December 4, 2017 Report Share Posted December 4, 2017 We have a Arctic Spa summit less than a year old. It periodically allows the temperature to drop more than 10 degrees without the heater kicking in. The thermostat can be set to 103 and the temp reads 96. The store we purchased from has no idea what it can be because it does sometimes work and we cannot predict when it won’t. If you try increase the heat, it still won’t kick in until it feels like it. We recently replaced the chip in the mother board on advise from the technician but does not appear to have helped. Pumps all work fine and it does hit the temperature you set it to at times. Any advise or similar issues would be great to hear. Quote Link to comment Share on other sites More sharing options...
Cusser Posted December 4, 2017 Report Share Posted December 4, 2017 I have a 30-year-old spa of a different brand. Over that time, on mine, when I would have intermittent no-heat, it was because the pump pressure was too low to activate the pressure switch to allow heating (a safety factor). Mine has an adjustable pressure switch so I simply adjusted that. Maybe your spa has similar ? Quote Link to comment Share on other sites More sharing options...
Mandy Posted December 4, 2017 Author Report Share Posted December 4, 2017 I’ll ask the dealer but it seems to not matter about the pump. It’s like it doesn’t realize what temp it’s at. Quote Link to comment Share on other sites More sharing options...
castletonia Posted December 4, 2017 Report Share Posted December 4, 2017 Does your hot tub have an economy or vacation mode? If so, it will only heat during the filter cycles, no matter what you have the temperature set for. Quote Link to comment Share on other sites More sharing options...
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