According to About.com, if the thermocouple does not reach the correct temperature, a safety valve stops the gas from flowing and extinguishes the flame. One common cause of this problem is owners who do not follow the manufacturer's directions for lighting the water heater pilot. Most require holding in the button or dial for approximately 30 seconds to allow the flame to heat the safety device before releasing it.Know More
If the flame goes out again, About.com recommends waiting a few minutes for any accumulated gas to clear the area. Then, follow the lighting procedure again while depressing the button or knob for 45 seconds to a full minute. The next step is replacing the thermocouple if the unit continues to go out after several attempts to light it. The procedure to replace this unit is a simple one requiring the removal of a couple of screws. The home improvement store needs the manufacturer name and model number to ensure owners receive the correct thermocouple. If this does not stop the problem, SFGate recommends calling a professional to replace the valve, "since it involves breaking and resealing important gas connections."
While the Water Heater Repair Guide agrees the thermocouple is the most likely cause of the problem, it also identifies a drafty location as a potential cause. Some attic fans create a big draft that is strong enough to extinguish the flame. Wind gusts through a vent are another potential culprit on gusty days.Learn more about Home Maintenance
Light a water heater by waiting for gas to dissipate, turning the control knob to pilot, igniting the flame, holding the control knob pressed in for one minute and turning the knob to the on position. Never attempt to light a gas appliance if you smell gas in the area.Full Answer >
A gas thermocouple works by creating a small amount of electricity that is sufficient enough to keep open the part of the gas valve that lights the pilot assembly. It acts essentially as a sensor which is connected to the main control valve.Full Answer >
To troubleshoot a Napoleon gas fireplace that will not stay lit, check the drip loop, the pilot light, the thermocouple and the gas valve to ensure all components are clean and working before replacing. If the gas fireplace pilot light will not stay lit, troubleshooting common problems can usually fix this issue.Full Answer >
To turn a water heater on, turn the gas supply off, and then set the gas knob to the pilot position. Press the reset button, and light the pilot. Turn the gas back on, and set the temperature to your liking.Full Answer >