I have a Noritz (model n-069m-ca) and every few days or so when taking a shower the hot water stops flowing. When I go to my tankless, the controller is flashing (no error code, just number 16 flashing for heat setting)
I have to power it off then on again, then it works fine.
thanks for the info. I did what was described on page 20, although mine did not have a filter/packing. It only had a rubber washer and the plug itself. There was one big plug and a small skinny one. They seemed very clean. I included a photo.
We'll see if it did anything.
It looks like I already have the isolator valve kit too