New tankless water heater heater. Ran for a couple months. Had a 99 error code. Checked the exhaust. It was pitched to the exterior that ended in a vertical 90 out a wall. Condensation had accumulated in the 90.
Put in a drain hole
Shop vacuum the line clear.
Unit would not reset itself.
Called Rheem, that's them on the phone providing the procedure.
Rheem Tankless hot water reset. Error code 99. Blocked flue.
FYI
This is my 7th property with these heaters.
They are great.
Their support is helpful.
Whish I could have found the answer online so I posted this crude video.
Thanks.
