Jandy Pool Heater Fault Check Ign Steps

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Jandy LXi 400 heater displaying "Fault Shorted H2O Sensor" errorJandy LXi 400 heater displaying "Fault Shorted H2O Sensor" error


Having a pool heater is a great way to enjoy your swimming pool all year round. However, like any other appliance, pool heaters can sometimes encounter faults. One common issue that pool owners face is a failure to ignite. In this article, we will discuss the steps you can take to troubleshoot and resolve this problem with your Jandy pool heater.

Step 1: Check the Gas Supply

The first thing you should do when your Jandy pool heater fails to ignite is to check the gas supply. Make sure that the gas valve is turned on and that there is sufficient gas in the tank. If you have recently run out of gas, it may take a few minutes for the gas to reach the heater. Give it some time and try igniting the heater again.

Step 2: Inspect the Igniter

The next step is to inspect the igniter. Over time, the igniter can become dirty or worn out, preventing it from producing a spark to ignite the gas. Carefully remove the igniter and clean it using a soft brush or compressed air. If the igniter is damaged or worn out, it will need to be replaced with a new one.

Step 3: Check the Flame Sensor

If the igniter is in good condition, the next component to check is the flame sensor. The flame sensor is responsible for detecting the presence of a flame once the gas is ignited. If the flame sensor is dirty or covered in soot, it may not be able to detect the flame. Clean the flame sensor using a soft cloth or fine-grit sandpaper to remove any buildup.

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Step 4: Inspect the Gas Valve

If the gas supply, igniter, and flame sensor are all in proper working condition, the issue may be with the gas valve. The gas valve controls the flow of gas to the burner assembly. Inspect the gas valve for any signs of damage or blockage. If you notice any issues, it is recommended to contact a professional technician to repair or replace the gas valve.

Step 5: Check the Control Board

If all the previous steps have been unsuccessful in resolving the ignition issue, it is possible that there is a problem with the control board. The control board is responsible for sending signals to the various components of the heater. Check for any loose or damaged connections on the control board. If necessary, consult a professional technician to diagnose and repair the control board.


By following these steps, you can troubleshoot and resolve the ignition issue with your Jandy pool heater. Remember to always prioritize safety when working with gas appliances and consult a professional technician if you are unsure or uncomfortable with any step of the troubleshooting process. With proper maintenance and regular inspections, you can ensure that your pool heater operates efficiently and reliably for years to come.

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