Heating Error Codes & Troubleshooting Hub

Quick guidance for common furnace and boiler error codes

Important Safety Notice

These pages provide quick guidance only. For urgent heating failures, gas odors, carbon monoxide concerns, or systems that won't restart safely — contact a professional immediately.

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Browse Error Code Guides

Select your heating system brand or error type

Lennox Furnace Error Codes

Common Lennox error codes and what they mean

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Goodman Furnace Blinking Lights

Decode Goodman LED flash patterns

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Navien Error Codes

Navien tankless and combi boiler error codes

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Viessmann Boiler Codes

Viessmann boiler error code reference

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Furnace Pressure Switch Errors

Understanding pressure switch failures

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Ignition Failure Codes

Common ignition lockout issues

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When to Call for Professional Help

Repeated error codes after reset attempts
Gas odor or suspected gas leak
Carbon monoxide detector alarming
System won't restart safely
Strange noises or burning smells
No heat in freezing temperatures
Error codes you don't recognize

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