My heater is 10 year old and working ever since installation. I unscrewed the thermal regulator (TR) cap to check the condition of the regulator and discovered no spring or regulator in there at all. Could it be lodged in the Manifold or make its way through the outlet plumbing?
The symptom I had that led me to investigate the TR was the E05 code I get when attempting to run the heater. I replaced the stack flue sensor a couple weeks ago and the heater operated fine for a week but now the E05 code is back and replacing the sensor again hasn't changed anything.
The symptom I had that led me to investigate the TR was the E05 code I get when attempting to run the heater. I replaced the stack flue sensor a couple weeks ago and the heater operated fine for a week but now the E05 code is back and replacing the sensor again hasn't changed anything.
