So was getting an LC1 error last night, unit was beeping.
So today I flushed it for 1.5 hours
Turned all back on and the green priority light is illuminated but the LC1 error is showing on display screen?

I have read May just need to be reset.

Anyone familiar with these, suggestions

TIA

LC codes are for the heat exchanger, it's most likely that you need to do a vinegar flush on the unit.

Edit: sorry I missed the flush comment. Did you flush with vinegar or something else? It needs to be something that will cut calcium buildup.

I believe thats the same error we got on one of our cabins when we had too high gas flow. A diaphragm had ripped and we had to replace with new regulator.

Certainly not an expert, and that cabin is the only one with Rinnai brand.

magnumtmp said:

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LC codes are for the heat exchanger, it's most likely that you need to do a vinegar flush on the unit.

Edit: sorry I missed the flush comment. Did you flush with vinegar or something else? It needs to be something that will cut calcium buildup.

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Flushed with vinegar

The error code is LC1 which is 1st warning for heat exchange buildup.
I'm hopeful the flush today corrected the problem.
Ran the hot water tonight with no issues , the unit is not beeping any longer but is still flashing the LC1 on the display along with the water temp.
The green priority light is illuminated which according to the manual means the controller is controlling the water temp and the unit is ready/ able to supply hot water

I'm just trying to eliminate the error code which is usually not displayed. In reading some stuff online have seen it may need a hard reset ???

Put in my own Rannai tankless electric. Going 3 years strong takes 54 well water to 110 no problem. Absolutely love it. $400 brand new. Worth its weight in gold here in missourah.

Edit. Had a Rannai LNG tankless installed in my old house in Katy. $3k and got the same results but it only had to cook 65-80 F line feed water. Not hard to install your own. Learned my lesson.