♨️Water Heaters Error Codes
Tankless and tank water-heater error codes. Ignition, flame-rod, flow-sensor and venting faults, and the parts that fix them across Rheem, Navien, Rinnai, A.O. Smith, Bosch and Noritz. Gas and venting work is flagged pro-recommended.
30 guides · Top brands: Rheem, Navien, Rinnai, Bosch
Section editor: Error Code Fixes Editorial Team ·
Recent Water Heaters Guides
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Rheem Water Heater Pilot & Burner Assembly Replacement Guide
Pilot won't stay lit, weak flame, burner won't ignite, or sooting? Replacing the Rheem pilot assembly or burner assembly fixes failed flame proving and gas delivery issues.
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State Water Heater E74 Error Code - Causes & Fix
E74 on State water heaters is not documented in official sources. Verify your exact model and display code before attempting repairs.
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Ruud E03 Error Code - Causes & Fix
E03 on a Ruud tankless water heater means overheat shutdown. Usually caused by low water flow or scale buildup in the heat exchanger.
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Ruud E02 Error Code - Causes & Fix
E02 means high-temperature or overheat fault. The water heater detected unsafe heat and shut down. Lower the setpoint or check sensors.
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Bosch E1 Error Code - Causes & Fix
E1 means the hot water sensor detected over-temperature (above 185°F). Most often caused by scale buildup or a faulty sensor.
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EcoSmart ECO 30 Error Codes - Causes & Fix
Repair guide for EcoSmart ECO 30 tankless water heater error codes E1, E2, E3, E4, E5, and S103. Diagnostic steps and parts.
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EcoSmart Eco 28 Error Codes - Causes & Fix
Troubleshoot EcoSmart Eco 28 error codes E1, E2, E3, E4, and E5. Step-by-step repair guide for thermistor, temperature, and flow faults.
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EcoSmart ECO 26 Error Codes - Causes & Fix
Decode EcoSmart ECO 26 error codes E1, E2, E3, and E5. Learn what each fault means, common causes, and step-by-step repair procedures.
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EcoSmart ECO 24 Error Codes - Causes & Fix
Decode EcoSmart ECO 24 error codes E1, E2, E3, E4, E5, and S103. Learn what each fault means and follow step-by-step repair procedures.
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EcoSmart Eco 22 Error Codes - Causes & Fix
Repair guide for EcoSmart Eco 22 tankless water heater error codes E1, E2, E3, E4, and E5. Covers thermistor faults and flow issues.
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EcoSmart ECO 20 Error Codes - Causes & Fix
Troubleshoot EcoSmart ECO 20 error codes E1, E2, E3, E4, E5, and S103. Learn what each code means and follow step-by-step repair instructions.
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Rheem Performance Platinum PDN Tankless Error Codes — Complete Fix Guide
Rheem Performance Platinum PDN tankless water heater error codes. Covers codes 10, 11, 12, 13, 14, 29, P1, and combustion/venting faults with step-by-step diagnosis.
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