Tilo

Dear ScubaDave Thank you so much for all the support and valuable inputs. I have followed your detailed steps and I think I found the problem thanks to you. After checking continuity It turns out that the ozonator was the main problem. I removed it and plugged the cables and system and pumps work with no breaker tripping! Hurray !.... Can't explain why this affected the heater comm. cable but what's important is that it works now...I registered all readings for ozonator replacement. I hope this will be the end of problem. Again...Thank you ScubaDave

Thank you ScubaDave for the valuable inputs....I think I was able to test continuity between the heater power pins and it failed compare to other cable pins (Pumps). Don't know what it means though! I have retitled the post as you wisely suggested. Thank you again.

Hi ScubaDave and thanks for the reply....Yes the breaker trips only when I connect the comm. cable with or without the main heater electrical cable connected. Even when all other cables (pumps etc) are connected or disconnected.

My 2007 Arctic spa hot tub is equipped with n.xm platform and IN.THERM-H4.0 Gecko AEWARE heater. The small output connector for the heater (heater communication cable) keeps tripping the breaker. The other connector (power cable) doesn’t. I replaced the breaker but with the same results.When unplugged I get the a communication problem error (RH-NC). Can this be fixed or do I have to replace the heater? How do I test it? Any help will be much appreciated.