navien 180

Hi, I have an NTI T200 combi boiler/tankless DHW - installed in 2003. This for a 2 adult household. Loads are basement underfloor (approx 500 sq ft), one small radiator/towel rack, and a 120,000 BTU air handler (vents in all parts of the house - total 2000 sq ft). The house is older, but...

My husband and I just bought our new home 3 weeks ago. The house had been vacant for a few months before we occupied it so I am sure the former owners turned down the temps on the system. Initially the system seemed like it was running well. We started getting an error message on it that said...