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Marc, Plumber
Category: Plumbing
Satisfied Customers: 1126
Experience:  Plumbing heating & home maintenance contractor
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We have a tankless Rinnai hot water heater and had a water

Customer Question

Hello, we have a tankless Rinnai hot water heater and had a water line burst and water sprayed all over the system, now it will fire up and then shut off after a few seconds. What is the fix?
Submitted: 1 year ago.
Category: Plumbing
Expert:  Phil replied 1 year ago.

Hello, if water got on the printed circuit board, remove it, and dry it out for 5 hours in an oven running no hotter than 140F... replace the card. If that fails you most likely will need a new printed circuit board.

The odds of this being a correct diagnosis without tests is in the 80 to 90% range, if you need to get into it deeper, see the link below. Let me know what you would like to do.