Question about Navien NP-240-NG Tankless Condensing Gas Water Heater 98% - 199,000 BTU

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My navien NP-240 (just installed) won't stay lit. Flame starts for a few seconds and then shuts down.

Digital readout on circuit board starts out at 140F, 04.24, 2012, U-2.1, back to 04.24, 2012 and after a short time shuts down.

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1 Answer

Hot water heater keeps shutting off.


This sounds like a circuit board has a component that may be heating up and failing. When the unit is unplugged power is shut off to the circuit board, which will allow the component to cool down and start to work again. If this is the case then the component will fail completely at some time.

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Sounds like pump issue or loose wire and not the timer.
Check wiring at pump. Read pump manual. The pump may have overheat cycle that trips off and then comes back on to protect pump without requiring owner to press reset button each time.

If timer turns OFF, then the manual override lever moves to the off position, and when timer turns ON again, the override lever moves to the on position. If override lever is moving without a tripper, then I would like to know more about that. Add a comment with photo posted on Flickr.

Same with the circuit breaker. The circuit breaker switch does not trip and reset once a day.

A loose wire could cause occasional connect-reconnect.
Check terminals inside timer for signs of high heat and burning. Check that insulated part of wire is not under the screw-down-plate.
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html#plate

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Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

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