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I posted here a week or two ago with problems with my hot water heater. I have tried a few things and have more information. I'm more confused now then I was a week ago. This is a Navien NPE-240A, about 4 years old, on city water. This all started suddenly when any single faucet (except the high...

More added info. Just took a shower with the hot water faucet running in the sink at the same time. First hot shower I've taken in 4 days.

Delta faucets all around. They have worked fine up till middle of this week.

Added info. After cleaning the filters, the unit started dripping water from inside. I opened the panel to see water spraying out of a relief valve on the recirc pump. I shut it all down and cleaned the relief valve. It was very full of calcium buildup. I also pulled some debris out of the pump...

I have a Navien NPE-240A tankless hot water heater delivering hot water throughout the house. All of a sudden, I am only getting luke warm water at each of the showers (which have a single mixing valve for hot and cold). However, I get piping hot water at sinks and the master bath (which all...