A: Hi ctk1972 and thank you for your question. for technical issues, please call the number on your unit or in your user manual.
A: Same problem on my tankless. I called Rheem tech support and they are useless. Checked settings and deep switches and are all normal. They asked me to clean the heater in case it is scaled (less than 1 year old tankless) :)
A: Good day Mac, thank you for contacting Rheem. Yes the O ring would go on both sides.