UtahTUbber Posted December 31, 2022 Report Share Posted December 31, 2022 New guy here....So I have a 2003 Caldera Tahitian and out of no where it just stopped heating and had the flashing temp light. When investigating I found my circ pump was hot to the touch but water wasn't moving. So i replaced that with new circ pump but still had no heat. After doing that I replaced the heater on it (trombone style heater) with the updated model that has the built in pressure switch. Still no heat.....after further investigation i noticed that a resistor on the heater relay board popped so i replaced that. After all this i am not getting power to heater when testing with volt meter. Also the Lim Ok light and Heater light were on prior to new heater, now after all the new stuff I have no Lim Ok light on and no Heater light on. Also, on the new Heater relay board D10 is showing green but no D9 light is on. I have replaced everything except the Main control board and I am totally at a loss for words. Every part is from dealer so didn't put any ghetto stuff on. Also, before I replaced with new Heater relay board I had the ability to turn jets on and all buttons worked and display showed temp. Now I have the 4 flashing bars. Appreciate any help guys and Happy New Years!!! Quote Link to comment Share on other sites More sharing options...
ratchett Posted January 1, 2023 Report Share Posted January 1, 2023 Does the circulation pump run but heaters/jets don't run? Did you test the temperature sensors or replace them? If the circ pump is running but no heat, that could indicate a temperature sensor has failed - they common points of failure in hot tubs and easy/cheap to test (with a multimeter) and replace. Quote Link to comment Share on other sites More sharing options...
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