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error Rheem
Error Code Solid red LED continuously blinking during error state
Multiple alert states like disconnection of lower thermistor, configuration data failure etc.
? What Causes This
Disconnection/failure issues within temperature control system.
✓ How to Fix It
1. Call service for specific diagnostics and resetting as required based on error message.
Source: page 23 of the official manual
From the manual
This error code appears in:
Rheem Gladiator Water Heater