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R3 is not one of the actual error codes, but is part of the computer system. What you can try to do is reset the computer in the heater. First you will need to turn the heater off, then turn off the circuit breaker for the heater. Wait about 15 to 20 minutes then reverse the order, the circut breaker then the heater. Try and start the heater and watch the display panel.
If they R3 reappears, then the problem is the control board for the heater and it will need to be replaced.