Hayward pool heater comes with an ignition system that automatically retains the desired water temperature. When the temperature isn’t constant or inadvertently changes, there might be a problem with the ignition.
I have received two major complains that can be attributed to ignition failure that you won’t find in the Hayward h400fdn manual. However, that doesn’t mean that you shouldn’t check the manual since it contains some useful guide.
Ignition Problems and Solutions
Someone reported that they have a Hayward h400 that doesn’t have the digital display – only three lights – with an electronic igniter that failed to start. You can hear the ignitor trying to light and see a green light. Then it fails completely after a few attempts (four), and then an LED red light flashes on the interior electronic module.
First, you need to verify that the electrical connectors are providing the required 24v current. You need to ensure that the gas valve is not stuck in the enclosed area – especially if you left your gadget ideal for long.
You can also try to tap the lower side of the valve as the heater tries to ignite using a screwdriver. Ensure that you don’t crack the valve.
Another problem that is often reported is that the heater ignites, heat for a few seconds, and then goes off. Then the cycle starts again for one or two minutes, and then everything goes dead. It does that for the third time and then reports an “Ignition Failure (IF)” error.
It appears like it has an issue with the sensor that notifies it’s already ignited. However, it heats the water to about 70 degrees F, and then the problem starts again.
That sounds like a Hi-Limit sensor problem – tripping. Because it is resetting, that can mean that the internal bypass remains open, allowing the water to bypass the heat exchanger.
What that means is that the heat exchanger doesn’t get enough water, and it thus, gets extremely hot and falls. You can check the bypass valve just in front of the header.
Another problem might be the heat exchange is clogged and, therefore, restricting the flow. Here are other things you can do:
- Clean the pump and filter strainer
- Check the connections and wiring
- Remove lint, dust, and dirt from the burner section
Those are some of the issues that you can find with your Hayward pool heater. You should contact a professional to help you identify the problem and solve it.