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Navien propane NR-240 shut down after 7 years
Here is my issue. One day a few weeks ago, my tankless NR-240 shut down. Me being semi technical could tell the guy would not fire up..no ignition. I checked for codes and nothing. I had a "trained" Navien tech come out and make a long story short, after replacing the ignition, the PCB and then the gas valve the ubit will still not fire up. He checked the gas pressure and the readings were at first jumping all over the place to a constant drain. The prognosos was now not enough pressure from propane tank. Gas company comes over and says the piping is too small at 1/2" and should be 3/4" cause of the long run from one side of house to the other. Gas guy says " I think this unit was running hard these years and decided to burn out". The max load on unit id 199, 000 BTU and no way the pressure can get at 8-13 WC. I really dont get why I am not getting much of a pressure reading now when for 7 years it ran OK