I have a gas water heater, 6 years old. The pilot will lite and then the burner lites up, after several seconds the burner goes out. It won't stay lite. The other gas appliances are working. What's...
The Thermocouple, which is part of the ignition system may be loose, where it screws into the gas control valve. Or it needs replacing.
But, first turn the gas off to the water heater, allow the burner compartment to cool off and with a flash light do a visual inspection of the burner chamber. If you see rust or scale in the chamber or on the burner, it will need to be cleaned. You can use a wire brush to clean the burner, making sure you do it carefully and not too aggressively. Use a shop vac with a hose and crevice tool to remove the debris that was created when you cleaned the burner. Be sure to vacuum the burner ports well.
Look for the Thermocouple ... it will be in front of the pilot flame and look like a 2 to 3" long piece of copper. It will have a copper tube running from the bottom of it to the gas control valve. Does the Thermocouple look pitted and worn? Dos it have a hazy film on the tip? If so, use some very fine grit sand paper to polish the Thermocouple. You don't want to sand it, as much polish it. After you have completed that, use a cotton ball dipped in alcohol to wipe off the Thermocouple.
You remember the copper tubing I mentioned that runs from the Thermocouple to the Gas Control Valve? Trace that tuning to the control valve and see if you can loosen the connecting nut to the control valve with your fingers. If you can, it's loose and needs to be retightened. Finger tighten it and with an appropriately sized open end wrench tighten only 1/4 turn more. Turn the gas back on and light the pilot, following the lighting instructions on the water heater. Allow the control knob to remain in the pilot position for at least 1 minute before turning the control knob to ON.
The water in the tank has probably cooled enough that the burner should fire up. If it doesn't turn on the hot water side of faucet, to drain the tank some, so that the burner will fire.
Once it fires, take a stick match, light it then blow it out. Quickly place it next to the opening at the top of the tank where the Exhaust Vent Pipe is connected to the tank. If the vent is drawing properly, it should **** the smoke quickly up the vent pipe. If it doesn't, you'll need to check the vent pipe for obstructions or disconnections at the couplings along the pipe.
If the burner does not continue to operate properly after you have completed all of this. Replace the Thermocouple. Remove the one you now have and take it with you to a hardware or home improvement store, so that you can match it up to the ones that are available.
Hope all this solves your problem. Please let me know.
Feb 12, 2011 |