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This type of error code ,will happen if ur have a voltage problem MD 76 board (tape sensor) .Error coming when u put STD tap or MIN tap?.Can u check the this two cable CN 1 and CN 2 MD 76 board.
Richland tankless is made by Rheem. C7-76 is communication fault with remote. Turn off power at remote and wait 5 minutes, turn power back on at remote, and see if problem clears. If problem continues, read below:
Tankless water heater, more than any other type of heater, need to be maintained. Maintaining tankless will probably not affect C7 76 fault code, but can prevent many other common error codes. http://waterheatertimer.org/pdf/Tankless-maintenance.pdf
Before calling service technician, open following links for Rheem tankless resources including error codes and Rheem chat. Disconnect wires from remote to see if system stabilizes. Unit will heat to default temperature without remote.
Machine error 76 is a bad fuser lamp. Machine error 78 is a bad thermistor. Machine error 77 means you hade either a Machine error 76 or Machine error 78 and turned the machine off.
Sometimes the machines will give a false code and can be reset. Unplug machine. Hold down the Menu key while powering back up. You should still get a Machine error message. Enter the number 9...The display should change to Maintenance 9 then enter 1. The Machine error will return. Enter 99 and then make a test print. If you get either a machine error 76 or 78 you will need to have service done on your machine to have either the lamp or thermistor replaced, and depending on the usage of the machine, it might not be a bad idea to replace the entire fuser.
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