Error Code 51 indicates a “Gas Valve Fault” on your Rheem Continuous Flow Water Heater. This error signifies a malfunction or improper operation of the internal gas control valve, preventing safe ignition or operation.
Immediately turn off the power at the isolation switch and shut off the gas supply valve. Due to the nature of this fault involving gas components, do not attempt any repairs yourself. Contact Hilton Plumbing urgently for a safe, professional inspection and repair.
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