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My Pentair MiniMax NT 5000 pool heater is showing a general fault error and won't work properly. What could be causing this issue and how can I fix it?

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I'm having trouble with my Pentair MiniMax NT 5000 pool heater - it's showing a general fault error and I'm not sure what's causing it or how to fix it. When I turn it on, it just displays "ERR" and the service light comes on, but it doesn't actually heat the pool. I've tried turning it off and on again, but the problem keeps coming back. Could this be related to the ignition system, a sensor issue, or something else entirely? What are the most common causes for this general fault error on the MiniMax NT models, and what troubleshooting steps should I try before calling a professional?

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