Hmmmm... The RKL I have on my frag tank had the same issue last month as well. I heard the powerbar clicking rapidly and the display kept on fluctuating between 67 and 88 degrees. I realized it was the temp probe, so I swapped out the bad one with a spare probe - problem solved.
The frag tank's Finnex Titanium heater doesn't have a built-in thermostat, so the tank went up to 89 degrees by the time I fixed the problem.
Lessons learned and takeaways:
- Always use a thermometer with a built in thermostat and never rely solely on a automation like RK or Apex.
- keep an eye on your probes and calibrate every so often.
- take advantage of advanced programming features, that will mitigate such failures - e.g. Delaying the turning on and off an outlet in rapid succession etc.
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