Call service technician Check polarity of 120 volt outlet Call Rheem for new PC board If the 3A glass fuse located on PC board is blowing, then something is drawing too much current or shorted on board... problem is probably bad PC board http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
Gene
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
Answers & Comments
Call service technician
Check polarity of 120 volt outlet
Call Rheem for new PC board
If the 3A glass fuse located on PC board is blowing, then something is drawing too much current or shorted on board... problem is probably bad PC board
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
Gene
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7