Czmartino Posted October 17, 2020 Report Share Posted October 17, 2020 Heater High Limit Thermostat Tripped On Caldera every 3-4 days! 4 flashing lights on control panel. I turn off the breakers for 1-2 min & turn on. Spa works great again for 3-4 days then trips. Already replaced filter & circulation pump. Help! Quote Link to comment Share on other sites More sharing options...
PNW Soaker Posted October 18, 2020 Report Share Posted October 18, 2020 Why not replace the hi-limit sensor then? You can check it with a multimeter as well if you don't want to buy one before you know it's bad. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted October 18, 2020 Report Share Posted October 18, 2020 Usually a flow issue. Remove your filter(s). If it stops, get new filters. If not, let us know and we'll go from there. Sensors can be tested with an ohm meter. A bad sensor is a possibility, but less likely than a flow issue. I recommend replacing both sensors at the same time. Quote Link to comment Share on other sites More sharing options...
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