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Good morning So down to it, the problem that is! I just purchased a used Jandy LT400 from a friend. I have it plumbed and wired... When I first turned it on, it went through diagnostic, then threw a pressure switch light... so I replaced it. Tried again...still have the pressure light...

Good morning learned folks... We just bought a house in December, had a pool, I was so excited... Its 16000 gallons, in ground...pretty nice! I decided to install a pool heater, bought it from a friend of mine for cheap...and Im pretty handy... Its a Jandy LT400. Its not working...thats why...