Error Code 33 indicates a “Heat Exchanger Thermistor Fault” on your Rheem Continuous Flow Water Heater. This sensor measures the temperature within the heat exchanger and ensures safe, efficient heating. A malfunction can disrupt normal operation.
Immediately isolate power to the unit at the electrical isolation switch and close all hot taps. Given the sensitivity and safety implications of heat exchanger temperature faults, professional intervention is required. Contact Hilton Plumbing for urgent and safe repairs.
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