Pool and Spa
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this will be in the keypad itself. Unfortunately there is not a specific test to verify this key.
The only way to test would be to go into the circuit board in keypad and troubleshoot the circuitry...only problem is that the board is made by others and is not made to be repaired thus no board schematics are available.
Just like a microwave oven keypad....you take pad off to troubleshoot and all you see is a board...so the board is changed since it is not serviceable. the keypad simply sends info to iq2020...