Arrived on site client stated that his Navien tankless water heater was giving an error code for exhaust blockage. Upon inspection i removed the exhaust pipe and put my camera up the vent and did not see anything blocking the exhaust. Client then stated that he removed ice from the vent 90 on top of the roof. I then put the exhaust pipe back together and unplugged the unit and put it back in and the error code did not pop up again. Ran fixtures in the home and every fixture is getting hot as it should. Client stated he has not had his tankless flushed and was unaware that it needed to be flushed so I left him options to do that as well but he declined so today we charged a minor diagnostic.
