L1: Ignition Lockout - The boiler's ignition has failed to light. This could be due to various issues, such as a lack of gas supply or a faulty ignition component.
L2: Flame Failure - This code indicates that the boiler has detected a loss of flame during operation. It may be caused by issues like a blocked burner or a faulty flame sensor.
L3: Overheat Lockout - The boiler has detected that it's overheating, which can happen due to issues like low water pressure or a malfunctioning thermostat.
L9/H9/HA/LA: These codes usually refer to different control or sensor faults. For specific details, consult your boiler's manual or a qualified technician.
LF: Low Water Flow - This error suggests that the water flow through the boiler is too low. It could be caused by issues in the water supply or circulation system.
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L5: Faulty Air Pressure Switch - This code indicates an issue with the air pressure switch, which is responsible for ensuring proper ventilation in the boiler.
L6: Faulty Fan or Airflow - The boiler has detected a problem with the fan or airflow. This could be due to a blocked vent or a malfunctioning fan.
Remember that these are general explanations, and the exact cause of the fault may vary depending on your boiler's make and model. When you encounter one of these fault codes, it's recommended to refer to your boiler's manual for specific troubleshooting steps or contact a qualified technician for diagnosis and repair.