Error Code 34 on your Rheem Continuous Flow Water Heater indicates an “Ambient Air Thermistor Fault.” This sensor monitors air temperature around the unit, and faults can cause inefficient performance or improper heater operation.
Switch off power to the water heater at the isolation switch and close all hot water taps. Due to the electrical nature of thermistor faults and the importance of accurate sensor readings, professional service is necessary. Contact Hilton Plumbing promptly to address this issue safely.
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