Furnace Gas Valve Shuts Off

Without adequate heating of the thermocouple or thermopile the furnace gas valve closes.

Furnace gas valve shuts off.

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. And one well lit match could cause an explosion. If i shut off the power to the furnace and turn it back on it starts up and. If the furnace still doesn t heat replace the flame sensor.

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 there isn t a flame the sensor will shut off the gas valve to keep the gas from getting into your house. We use cookies to give you the best possible experience on our website.

If your furnace shuts off too often you could have a corroded or dirty flame sensor. 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. 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. As a result this cuts off the supply of gas to the pilot light.

If the flame sensor is dirty or has become corroded the flame won t. If it does not detect a flame it shuts the gas valve. A 24 vac transformer or the thermopile powers the main valve. Also can the furnace be changed out without removing the valve or does the valve not fit through the knock out in the cabinet.

Ultimately the thermocouple acts as a safety mechanism that prevents gas buildup within the home. 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. That thermo switch opens if the furnace gets too hot and shuts down the gas.

A gas shut off valve can be found in most modern gas appliances. Ntrol board will shut off voltage to the gas valve to prevent the furnace from heating. 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. If the flame sensor does not detect a flame the co.