HVAC Error Codes: Complete Guide for All Brands
HVAC systems display error codes when something isn’t working correctly — whether it’s a furnace, boiler, tankless water heater, air conditioner, or heat pump. This page is your complete resource for identifying what those codes mean and what you can do next. Choose your brand below to explore detailed explanations, common causes, and troubleshooting steps.
Browse Error Codes by Brand
Below is a growing library of error code guides for major HVAC manufacturers. Select a brand to view all available codes.
Lennox Error Codes
Rheem Error Codes
Carrier Error Codes
Trane Error Codes
Goodman Error Codes
Bosch Error Codes
Daikin Error Codes
American Standard Error Codes
More Brands Coming Soon
What HVAC Error Codes Usually Mean
While every manufacturer uses different codes, most HVAC error messages fall into a few common categories:
- Ignition or flame failures
- Blocked vents or airflow restrictions
- Sensor or thermistor faults
- Water flow or pressure issues
- Electrical or communication errors
- Overheating or safety lockouts
Each brand page breaks down these issues in detail so you can understand what’s happening with your system.
When You Can Troubleshoot vs. When to Call a Technician
Some error codes can be resolved with simple steps like:
- Resetting the unit
- Checking filters
- Restoring water flow
- Ensuring power or gas supply is on
However, repeated errors, safety lockouts, or codes related to combustion, electrical components, or internal sensors should be handled by a certified HVAC technician. If your system won’t reset or continues to shut down, professional service is recommended.
Professional HVAC Service in Vancouver & the Lower Mainland
Some error codes point to simple issues you can troubleshoot, but others signal deeper mechanical or safety problems that require a certified technician. Our team works with all major HVAC brands and provides expert service for:
- Furnaces
- Boilers
- Fireplaces
- Tankless water heaters
- Air conditioners
- Heat pumps
If your system won’t reset, continues to lock out, or repeatedly shows the same error code, professional diagnosis ensures the issue is resolved safely and correctly.