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hopefully fixed! Well I got the heater open last night ...and had printouts of this forum, the heater troubleshooting guide, and fortunately there was some good schematic information on the inside of the heater cover. I could get the fail consistently if I followed the instructions for turning...

resolved? Hi! Batass, did you ever fix your problem? My g/f has the identical model Rinnai - with the same symptoms. The heater will always start when set to 'on', and the light will come on. Several days later it will be still set to 'on' ...but the light will be off and the unit will...