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As a follow up to this post it seems that the 4 flame loss cycle on start up is happening more frequently as the weather turns colder. Any time the unit is idle for more than about2-3 hours now. After going through the 4 flame loss cycle (start up, burn, post purge, repeat 4 times) it starts up...

plumber69 - that's weird. 4.2 is not anywhere near the upper limit for gas supply pressure on the Navien. Putting it at the minimum of 3.5 solved the issue for you? Just to add I didn't use hot water all day until about 5 pm in the afternoon yesterday. Unit started up without the short...

Thanks for the suggestions. Bannerman - Hot temperature setting is 115 F. I am turning on the hot water only side of a two handle faucet (~1 gpm) in the morning to test. Breplum - will double check the gas pressure. Forgot to mention, during the short cycling I do smell a faint amount of...

Hi All, I have a Navien NPE 240 A2 that was installed 3 months ago. I've noticed that in the mornings/first time I call for hot water the tankless will go through 4 short cycles before stabilizing and delivering hot water. The odd thing is the flow says 4.4-4.8 gpm which is inaccurate as I'm...