Boiler Error Codes
Find error code meanings, safety information, and when to call a professional technician for all major boiler brands.
Call 778-909-5731When to STOP and Call a Technician
Do not attempt repairs if you experience:
- Gas smell near the boiler
- Repeated safety lockouts
- Water leaks or flooding
- Unusual noises or vibrations
- Multiple error codes appearing
- Any uncertainty about safety
Select Your Boiler Brand
Navien
Navien boiler and tankless water heater error codes
Viessmann
Viessmann boiler error codes and diagnostics
Bosch
Bosch boiler error codes and fault diagnosis
Lochinvar
Lochinvar boiler error codes and troubleshooting
Weil-McLain
Weil-McLain boiler error codes
Triangle Tube
Triangle Tube boiler error codes
Common Error Code Categories
Ignition Failures
Boiler won't light or start. Common causes:
- Gas supply issues
- Igniter problems
- Flame sensor faults
- Air in gas line
Pressure Faults
System pressure too high or low:
- Water leaks
- Expansion vessel failure
- Fill valve issues
- Pressure relief problems
Temperature Errors
Overheating or temperature sensor issues:
- Circulation pump failure
- Sensor malfunction
- Blocked heat exchanger
- Low water flow
Ventilation Issues
Exhaust or air intake problems:
- Blocked flue
- Fan failure
- Pressure switch fault
- Condensate blockage
Need Help with an Error Code?
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