Error Code 74 on your Rheem Continuous Flow Water Heater indicates a “Miscommunication Between Remote Controllers.” This fault suggests a problem with the remote control units communicating correctly with the water heater, potentially impacting temperature settings and operation.
First, try resetting the remote controllers by turning off the power supply at the isolation switch, wait a few minutes, and then switch power back on. If the problem persists, there may be a wiring or remote control fault requiring professional inspection. Contact Hilton Plumbing to safely resolve this issue.
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