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Water Heater Does Not Light

The 5 most common part(s) or condition(s) which cause the symptom Water Heater Does Not Light are listed below starting with the most likely. Check or test each item and watch any available videos.


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To see parts for your water heater, you need to enter your model number on the right. The system will then display parts that are associated with your water heater.

Igniter

If the water heater burner does not light the igniter might be bad. Some water heaters use a hot surface glow bar igniter at the gas burner for ignition. If the igniter fails and does not glow with voltage applied it is bad and should be replaced.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your water heater, you need to enter your model number on the right. The system will then display parts that are associated with your water heater.

Pressure Switch

If the water heater burner does not light the pressure switch (sometimes referred to as the vacuum switch) might be bad. The draft inducer motor air flow through the burner should close the pressure switch to signal the control that proper air flow is present and the ignition process can continue. If the water heater does not heat the pressure switch might be defective causing the ignition process to stall.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your water heater, you need to enter your model number on the right. The system will then display parts that are associated with your water heater.

Thermocouple

If the water heater burner does not light than the thermocouple may have failed and will need to be replaced. On gas water heaters that use a standing pilot a thermocouple style flame sensor might be used to detect the pilot flame. The other end of the thermocouple attaches to a gas valve and thermostat assembly. Usually when a thermocouple fails the pilot can be lit but drops out as soon as the button on the gas valve is released.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your water heater, you need to enter your model number on the right. The system will then display parts that are associated with your water heater.

Pilot

If the water heater burner does not light than the pilot may have become restricted. If the pilot can not be lit then the pilot is likely plugged with carbon deposits. Sometimes the pilots can be removed and flushed with HOT water to clear but usually a restriction requires replacement of the assembly.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your water heater, you need to enter your model number on the right. The system will then display parts that are associated with your water heater.

Spark Electrode

If the water heater burner does not light the spark igniter might be bad for the pilot flame. Some water heaters use a spark electrode to light the pilot flame. The control module sends intermittent high voltage sparks to light the pilot. No spark at the pilot could indicate a defective spark electrode.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

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