What causes AGS error on Laars pool heater Model lx400n?

An AGS error on a Laars pool heater model LX400N indicates an air management problem. This could be caused by:

- A dirty filter. Check the filter and clean or replace it if necessary.

- A blocked snorkel. The snorkel is the pipe that provides air to the burner. Check the snorkel and remove any obstructions.

- A faulty combustion chamber sensor. The combustion chamber sensor is responsible for monitoring the temperature of the combustion chamber. If the sensor is faulty, it could cause the AGS error to occur.

- A faulty pressure switch. The pressure switch is responsible for monitoring the water pressure in the heater. If the pressure switch is faulty, it could cause the AGS error to occur.

- A faulty circuit board. The circuit board is the brain of the heater. If the circuit board is faulty, it could cause the AGS error to occur.

If you are unable to resolve the AGS error by following the above steps, you will need to contact a qualified technician for further assistance.