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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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.

Dec 22, 2015 | Water Water Heaters

1 Answer

No power on unit/Remote Controller

try leaving the remote unplugged and unplug the unit for 10 seconds and plug only the unit back in. If you get hot water without the remote connected but nothing after doing the same thing with the remote connected then your remote may have shorted out. Otherwise your circuit board may have had a short. In which case, call Noritz for a replacement.

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Steady water coming out of drain line

Bad safety shut off valve turn off the power and drain the heater and replace the valve

Nov 02, 2012 | Water Heaters

1 Answer

I have an Intermatic WH-40 timer set up on swimming pool pump. I am not using any start/stop mechanical pieces on the dial face. Yet my pump does shut off everyday for short time period. Why is this...

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.

Check circuit breaker for signs of burning and smell of electrical burning and sound of shorting on the busbar.

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.

May 31, 2011 | Intermatic WH40 - Water Heater Time Switch...

1 Answer

Had hot water this morning, then a leak in public water lines about block away, caused pressure drop. No hot water. Shut breaker off, and found 2 safety thermal shut-offs (couldn't tell if they had been...

It is possible that when pressure dropped from city supply that it created syphon and sucked water from your heater back into city lines. This could have caused unit to burn out heating element. I don't know if your unit has any backflow prevention to prevent this from happening.If you can I would suggest that you check incoming power to your heater. It should be around 240 volts. I also would check reset or limit switches again. Hope this helps. Thanks

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I have a RV Atwood water heater and it ignites and starts ok but shortly thereafter it shuts off. I wait a minute or two and it restarts but shuts off again. Could it be the circuit board, or the sensor in...

You may have a control board issue, there is no sensor that is IN the water tank your thermostat controller are exterior to the tank under the black foam looking piece which I think is where your trouble lies

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Rheem tankless heaters, unlock 140f limit


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Atwood water heater runs for two minutes and shuts down, replace thermostat and EEC clean thermocoupler still no joy, short out thermostat lead it ran until the EEC open. any ideas???

If you have the little thermo cut off in the circuit to thermostat, (little resistor inside small plastic tube) try removing it from the circuit. Just pull the wires at each end and attach directly to thermostat where it was before. If it works now, you found the problem, if not, get back to me.

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2 Answers

Electronic fire. fires up , Shuts down after 5 sec.

it sounds more like you have the ignitor wire shorting out on metal and won't allow it to stop trying to light the burner, hold the wire away from any metal and see if it helps, if this isn't the caee your circuit board needs to be replaced,

Jun 22, 2009 | RTO Atwood Water Heater - 6 Gal LP

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Combi boiler Glow worm 24ci digital fault

refere to glowworm expert advise

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