Error Code 15 signals a “Boiling Safety Device Activated” on your Rheem Continuous Flow Water Heater. This safety mechanism triggers when dangerously high temperatures are detected, typically caused by severe water flow restrictions or sensor faults.
Turn off power at the isolation switch and stop all hot water usage immediately. Due to the potential dangers associated with boiling water inside the unit, you must not attempt repairs yourself. Contact Hilton Plumbing immediately for professional inspection and resolution.
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