What does Combustion Noise mean?

The boiler is producing excessively loud combustion noises or persistent humming sounds during operation.

• Incorrect pump output or pump map setting
• Incorrect gas/air ratio
• Faulty gas valve
• Malfunctioning external gas flow monitor (for natural gas)

Click steps to track your progress.

1. 1

   Set the pump output or pump map correctly and to maximum output.

2. 2

   Check the gas/air ratio and correct if necessary (requires technician).

3. 3

   For natural gas, check the external gas flow monitor and replace if necessary.