[SOLVED] Can't raise temp above 110 on Navien 240a

[guido]

My wife took a shower in the bathroom right next to our tankless, and the handle is broken or something, she was screaming because of scalding water. So I run and turn down the tankless temp from 118 to 100.

Afterwards I want to turn it back, but it sticks at 110. I figured some safety feature.

Now a day later I want to take a bath elsewhere in the house and I try to turn it back up, but it's still stuck at 110. It just flashes "110" plus arrow does nothing.

I try to search on this forum and piles of manuals. The only clue I found is in http://condensingsaves.com/wp-content/uploads/2014/10/2_20026535C_Eng_NPE-Operation-Manual.pdf

"If a hot water faucet is open, you can adjust the temperature only from 98-110°F (37-43°C)."

There are definitely no faucets open at all - what's going on here?

Is there an override?

I read something on the forum about lime alarm dip switches, I already tried those - that wasn't it unfortunately.

Thanks for reading!

 

[Dana]

Did you try hitting the RESET button? That may or may not restore the default output temperature to the original 120F, but it's worth a try.

If you have a hot water recirculation system with the pump running the water heater would sense that as an open faucet.

 

[Sponsor]

 

[guido]

@Dana, thanks for the suggestions. What I tried is again dipswitch 2 to turn circulation off, but this time I waited longer before trying it again. No luck -- BUT! Then I recalled the circulation pump has a valve. I found that left of the circulation pump, gave that a 90 degrees turn and then I was able to put it back up!

After that I put the valve back, and put dip switch 2 back up.

Going to let it be for a while now and then I'll try to see if my water is nice and hot again.

Thank you for taking the time to respond!!