🔥Boilers Error Codes
Gas and condensing boiler error codes. Lockout faults, ignition failures, pressure switch errors, and combustion safety codes for residential and commercial boilers including Navien, Rinnai, Noritz, Burnham, and Weil-McLain.
104 guides
Section editor: James Rutherford · Master Plumber
Recent Boilers Guides
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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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Burnham/U.S. Boiler Fault Code 2 — Ignition Lockout Fix
Fault Code 2 on a Burnham (now U.S. Boiler Company) 7-Series, 8-Series, ESC2, or Alpine gas-fired boiler indicates an ignition lockout — the integrated...
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Lochinvar Knight E02 — High Limit / Stack Temp Fix
E02 on a Lochinvar Knight wall-hung (WHN, WBN) or Knight XL floor-mount condensing boiler indicates a high limit or stack temperature lockout. The SMART...
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Navien NPE/NCB Code E003 — Ignition Failure Fix
E003 on a Navien NPE-A, NPE-S, NCB, or NFC series condensing combi/boiler indicates an ignition failure — the control attempted ignition through its full...
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Weil-McLain Code 1 — No Flame Sensed Fix
Code 1 on a Weil-McLain Gold or Ultra Series boiler means the boiler attempted ignition but did not prove flame within the trial-for-ignition window...
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Weil-McLain Code 3 — Low Water Cutoff Fix
Code 3 on a Weil-McLain Gold or Ultra Series boiler (Ultra 80/105/155/230/310/399, GV90+, and WM97+ platforms) indicates a low water cutoff (LWCO) lockout —...
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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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