Furnace Gas Valve Shuts Off

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

Furnace gas valve shuts off.

Sometimes if the flame sensor is dirty it will fail to detect a flame. Ntrol board will shut off voltage to the gas valve to prevent the furnace from heating. Ultimately the thermocouple acts as a safety mechanism that prevents gas buildup within the home. Try cleaning the flame sensor with a fine abrasive pad.

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. If it does not detect a flame it shuts the gas valve. 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 the flame sensor is dirty or has become corroded the flame won t.

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. 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. If your furnace shuts off too often you could have a corroded or dirty flame sensor.

If there isn t a flame the sensor will shut off the gas valve to keep the gas from getting into your house. A flame sensor lets your system know there s a flame when the gas valve is open. We use cookies to give you the best possible experience on our website. As a result this cuts off the supply of gas to the pilot light.

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. That thermo switch opens if the furnace gets too hot and shuts down the gas. Also can the furnace be changed out without removing the valve or does the valve not fit through the knock out in the cabinet. If the flame sensor does not detect a flame the co.

And one well lit match could cause an explosion. A 24 vac transformer or the thermopile powers the main valve. Well the flame sensor rod is a safety device designed to detect a flame in your furnace burners. If the furnace still doesn t heat replace the flame sensor.