I change the gasvalve the pilot assembly thermelcoupling ,pilot tubing,and flooded the the boiler to see if it is leaking and check to see if it is short cycling and no change it keeps happenning and check the chimney it has good draft.the boiler is 4 years old and this is the first season this is happenning.
Haha, I fixed it, It is the chimney, I took the flue elbow off and clean all the dirt inside the chimney, and I even used a hammer drill to make the chimney a little bigger. it is all good now..
Now, what do I do with my extra Gas Valve? costed me $120..
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This could be a tough one without being able to examine it. First, have you precisely followed the relighting instructions printed on the heater (turn the knob to "pilot," hold down the button, etc.)? One other thought: the gas pressure to the pilot flame is very low - if some water got into its little supply pipe it could keep gas from getting to the pilot burner device. You would have to disconnect the pilot tube from the gas controller valve and blow it clear, then try again. Dealing with this type of gas problem can create dangerous conditions if not done properly. If water got into the gas controller valve (the one with the knobs and buttons) it will have to be replaced. If unsure, consult a plumber.
Sounds like the air intake is clogged, and pilot and burner tubes are dirty. All manufacturers say that flooded water heater should be replaced and not repaired.
You can clean air intake and burner assembly, and then next step would be to replace burner assembly and replace gas valve thermostat to see if functionality returns. Expense of replacing parts is about half the cost of new gas water heater from box store, and still no guarantee that old heater will work. http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean
Thermocouple has failed., replace thermocouple or dirty pilot assembly, not enough heat being genrated to produce the 30 mili volts D.C. current to hold the pilot valve open. Clean pilot orfice. Remove assembly and pilot tubing from gas valve. Blow into pilot tubing to remove dirt.. Make sure pilot flame is engulfing the thermocouple.
Yes, a good place to start would be to run a burner brush through entire tube to make sure all spider webs are out, then blow through again. If that doesn't cure it, double check your position of burner tube in chamber. Sometimes if it's moved into chamber too far, it will tend to back-up flame in to tube. I've had some that I re-installed and was sure I put it back exactly where it was before, but had to pull burner tube back approx 1/8"-3/16" to get a proper flame. Make sure it's centered in chamber as well.
push in the yellow or grey button on the gas valve and click the piezo ignighter repeatedly keep the gasvalve button depressed for 20 seconds and the boiler should light if it does not you have a fault come back for more advice if this happens
The pilot assembly should look similar to the pic above. Depending on where you live, you may be required to hire a certified plumber to replace the parts. If not you can do it your self. Keep in mind if it's not staying lit you also need to check the thermostat and the thermocoupler before replacing the pilot assembly. There is a good chance it is just the thermocoupler going out. It is one of the first things to check when troubleshooting a pilot light problem with a gas water heater. A thermocouple determines if the pilot light is lit. If it's not lit, the gas valve fails. If that's the problem, replace the thermocouple.
Shut off the gas valve on the water heater and the gas valve on the line near the heater. Remove outer and inner doors, and loosen the pilot and supply tubes and the thermocouple connections to remove the burner assembly.
Loosen the screw holding the thermocouple to the bracket. Remove old thermocouple. Bring it with you to the store to ensure you are buying the proper replacement.
Install the new thermocouple. Position the thermocouple so that the pilot flame heats 1/2 inch of the tip.
Reinstall burner assembly in the water heater. Tighten burner supply tube, pilot tube and thermocouple connections. Tighten thermocouple no more than a quarter turn more than hand-tight.
Turn on both gas valves. Check supply tube and pilot tube for leaks with soapy water. If soap bubbles, tighten connections to fix leak. Ignite the pilot light, and make sure the thermocouple tip is heating up. Replace inner and outer doors.
The plumbers repair should be guaranteed, give him a call back.
It sounds to me that the pilot flame needs to be adjusted or the thermocouple is not aligned properly or there is a draft that is blowing out the pilot.