I have had some issues with my hot water heater, I have replaced the thermocouple and the gas valve but the pilot light will not stay lit. I can get it to run enough to bring the temp up to what it is set to be but when hot water is used, the pilot will go out and not light again.

Is there something that I may be overlooking? HELP PLEASE!

Is there a chance of a draft possibly caused by a new appliance like a exhaust fan? Are you replacing both doors that enclose the burner?

Is the thermocouple solidly in the pilot flame?

I have replaced both doors and there are no new appliances around the heater. The thermocouple is securely in place also. I am at a loss.. I have basically replaced the entire heater save the water tank! Please HELP

Perhaps, I wasn't clear, is the thermocouple in the center of the flame?