navien

I hired a plumber to install a Navien 240a2. When I run the hot water in one my showers or faucets and then inspect the unit, the line labled "HOT" feels cold and the line labeled "COLD" feels hot to the touch. The red valve is connected to a terminal that is labeled HOT The showers and...

I have a Navien NCB 240E combi-boiler set up for hydro space heating and domestic hot water (installed 2019) I am having an ongoing issue and can't figure it out. My domestic hot water side is set to around 125 F. When I turn on a faucet to call for hot water, the flow rate is 0.6 GPM. The...

Hello, I am preparing to do a flush of my Navien NCB-240E combi boiler. I have it connected to a hydro air handler on the space heating closed loop side but for now I am only going to flush the domestic hot water side. In all of the YouTube videos I've watched the manifold systems have service...

I'm among the millions of folks impacted by the "big chill" in Texas and could use some help. I have a tankless Navien 240. One of the fittings broke during the freeze, it's leaking water and is the reason I'm getting error code E438 (I believe) and, more importantly, the reason we haven't had...

I had a Navien NPE 240a installed in my house 3 months ago. For the most part it works great. I had one instance where I got an ignition failure error, but I hit the reset button and haven't gotten it since. However, in the last week I became aware of a loud pop sound occurring that sounds like...