Furnace Gas Valve Shuts Off

Now normally this is a good thing for you because if it didn t shut the gas valve your furnace could fill your home with gas.

Furnace gas valve shuts off.

As a result this cuts off the supply of gas to the pilot light. My rheem home gas furnace gas valve chatters off and on is very noisy and wakes me up i replaced the thermostat answered by a verified hvac technician. If there isn t a flame the sensor will shut off the gas valve to keep the gas from getting into your house. And one well lit match could cause an explosion.

If the furnace shuts down normally and then later the thermostat calls for more heat the blower should start as soon as the thermostat closes then after a short delay the igniter will spark causing a snapping sound usually three times before it gives up. That thermo switch opens if the furnace gets too hot and shuts down the gas. A flame sensor lets your system know there s a flame when the gas valve is open. Try cleaning the flame sensor with a fine abrasive pad.

Ntrol board will shut off voltage to the gas valve to prevent the furnace from heating. 2006 irc g2420 1 2 prohibited locations says shut off valves are prohibited in concealed locations and g2420 5 says shut off valves have to be separate from the appliance. Without adequate heating of the thermocouple or thermopile the furnace gas valve closes. If the furnace still doesn t heat replace the flame sensor.

A gas shut off valve can be found in most modern gas appliances. You will occasionally have to replace the gas shut off valve or thermocouple as it is also called. Sometimes if the flame sensor is dirty it will fail to detect a flame. If it does not detect a flame it shuts the gas valve.

These two switches are safety switches and they are in series which means power passes from one to the other and then to the module board which sends power to the gas valve and the igniter which does the sparking and ignites the gas. Well the flame sensor rod is a safety device designed to detect a flame in your furnace burners. If the flame sensor is dirty or has become corroded the flame won t. They are designed to close the gas supply if the pilot light flame does not come on or if it is extinguished for some reason.

If the flame sensor does not detect a flame the co. Ultimately the thermocouple acts as a safety mechanism that prevents gas buildup within the home. If your furnace shuts off too often you could have a corroded or dirty flame sensor. A 24 vac transformer or the thermopile powers the main valve.