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Diagnosing a high-limit error that shouldn't be happening on Sundance Palermo

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SerjicalStrike:
A few things to check:

The capacitor on the board.  it is the big silo looking thing sticking out in the middle of the board.  Does it have a flat top, or is the top rounded over?

The flow switch.  Make sure it is reading fairly close to 0 ohms when closed, and that there is no reading when open.  If the ohms are in the hundreds/thousands/millions, your flow switch is bad.  If you mix that with an intermittently bad circ pump or a circ pump that isn't pushing enough water, the heater will run too hot. 

Heater relays.  You can either ohm them out with the power off or check for voltage when the power is on.  240v to the heater before the red light kicks on indicates a stuck relay. 

If those check out fine, in my experience, you are 99% looking at a bad temp sensor.

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