Error Code 66 signifies a problem with the “Water Bypass Valve” inside your Rheem Continuous Flow Water Heater. This valve helps regulate proper water flow and temperature control. A malfunction can lead to inconsistent hot water or shutdown.
Turn off power at the electrical isolation switch immediately and close all hot water taps. Issues involving the water bypass valve require professional intervention to address safely and effectively. Contact Hilton Plumbing to arrange urgent and safe repairs.
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