How to Troubleshoot a Hot Water Heater Pilot Light That Relight

1. Check the thermocouple: The thermocouple is a safety device that shuts off the gas supply to the pilot light if it senses that the flame has gone out. If the thermocouple is dirty or damaged, it can cause the pilot light to repeatedly go out and relight. To test the thermocouple, hold a lit match or lighter near the end of the thermocouple. If the pilot light stays lit, the thermocouple is working properly. If the pilot light goes out, the thermocouple needs to be replaced.

2. Check the gas supply: Make sure there is an uninterrupted gas supply to the water heater. If the gas flow is restricted or interrupted, the pilot light will not be able to stay lit. Check the gas valve to make sure it is open all the way. Also, inspect the gas line for kinks or leaks. If you suspect that the gas supply is the problem, contact your gas utility company.

3. Check the burner assembly: The burner assembly is the part of the water heater that the pilot light sits in. If the burner assembly is dirty or damaged, it can cause the pilot light to flicker or go out. To clean the burner assembly, use a wire brush to remove any dirt or debris. Also, check the burner for cracks or damage. If the burner assembly is damaged, it needs to be replaced.

4. Check the draft hood: The draft hood is a metal covering that helps to vent the exhaust gases from the water heater. If the draft hood is blocked or obstructed, it can cause the pilot light to go out. Make sure the draft hood is clear of any debris and that there are no obstructions around it.

5. Call a professional: If you've tried all of the above steps and the pilot light still won't stay lit, it's best to call a professional water heater repair technician. They will be able to diagnose the problem and make the necessary repairs.