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Much appreciate running these questions to ground. Hope others find the detail useful in the future. Cheers!

It is a 10 year old EasyTouch system, wall panel and hand-held. As I went along, I tried both Auto and Service modes, also pushing the membrane buttons in addition to buttons on both the panel and the hand-held, switching between spa and pool. Anyway, the old heater did have a lot of...

Thanks much for the replies. End result was that I finally called a pool pro who offered to either troubleshoot further, or just replace the whole heater on the suspicion that the (expensive to replace) heat exchanger was the problem. I opted to cut my losses and went for a warrantied...

EDITED from original post to correct info. Just replaced Pentair MasterTemp 400 (10 years old) control board with a new Rev14 Board (part 42002-0007S) that has an LCD instead of LED. After boot cycle, the LCD shuts off, unlike the LED on the original Rev8 board, which remained on to display...