Error Code 12 on your Rheem Continuous Flow Gas Water Heater (874, 876 Series A12-A26) means that the unit has ignited successfully but then lost the flame. This usually indicates insufficient gas supply or issues with gas pressure stability.
Ensure your gas isolation valves are fully open and confirm the gas supply is stable and operational. If this doesn’t resolve the issue, immediately switch off power to the water heater at the isolation switch, and close all hot water taps. Due to the nature of gas-related issues and potential safety risks, a professional inspection is essential. Contact Hilton Plumbing to safely address and repair this issue.
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