Rinnai E- Series Troubleshooting Manual page 19

E 01
24 volt short circuit
Remove all 24 volt connectors, such as: fan, pump, any three port valve and the 24 volt plug to the connecting
block. Check for a short circuit in the disconnected components. Next; switch on power to the control board with all
the 24 volt components disconnected. Reconnect the components one at a time, if code E 01 appears when you
plug up a component, that component has a short circuit. Rectify any short circuits or replace defective component
causing short circuit.
19
008082013GW