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How to install circuit board on Rheem tankless water heater
How to install circuit board
Instructions for outdoor unit:
Install the new PCB
Install the Programming Chip in connector A on the PCB.
Turn power back on to the unit.
Put up Dip switch numbers 1 and 2 into the “On” position.
Press and hold the SW3 button until the red light on the PCB goes completely solid.
Let go of the button and put down Dip switch numbers 1 and 2.
Press and hold the SW3 button, while holding down the SW3 button, keep tapping the SW1 until the remote reads the same minimum manifold reading as the old PCB.
Let go of all buttons.
Press and hold the SW3 button, while holding down the SW3 button, keep tapping the SW2 until the remote reads the same maximum manifold reading as the old PCB.
Let go of all buttons.
Unit is now programmed; do not start without the front cover back on the unit.
More info about tankless
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