What causes a furnace gas valve to fail?

When They Fail The valve itself may have simply worn out or may be damaged due to basement seepage or submersion. Alternately, one of the electronic gas ignition components or a glitch in the safety circuit may be to blame. If your furnace has a standing pilot light, the thermocouple could be worn out.

What is the gas valve on a furnace?

The gas valve on your furnace is one of the most important parts. It is ultimately responsible for delivering an adjusting the flow of gas pressure to your furnace to keep it lit when running. A gas valve replacement is a common furnace repair in older furnaces or when a gas leak is present.

How do you reset a furnace safety switch?

How to Reset an Electric Furnace

First, turn off the power supply to the furnace by turning off the breaker in the circuit box.
Locate the reset button on the furnace and press it to reset the furnace.
If the button is popped up, press it down.
Return the cover to the blower compartment and turn the power on.

How do you reset the gas valve on a furnace?

How do you restart a gas furnace?

Turn the circuit breaker off and switch the furnace power button off too.
Access the pilot light by removing the access panel.
Turn the gas control valve off and let the gas dissipate for five minutes before turning it back on in order to prevent a fire hazard.

What happens when gas regulator fails?

If your gas regulator safety valve is not working properly, it may fail to detect through sensors whether a flame is lit in your heating system and, as a result, continue to produce gas into the home environment rather than shutting off, which it’s normally designed to do.

How does a gas valve work in a gas furnace?

This part is a valve that is held open by an electric voltage produced by a pilot flame. The button on the top(looks like a shaft in the illustration) is pressed to open the valve to allow pilot gas to flow through the manual valve on the front of the safety to the pilot assembly.

How can I troubleshoot my furnace gas valve?

Troubleshooting Furnace Gas Valves 1 Check to see if the pilot light is on. If not, follow the manufacturer’s instructions for relighting the pilot light. It… 2 Check to see if the thermocouple or thermopile is generating enough voltage to keep the safety valve open. If not, you… More …

What are the safety components of a gas furnace?

The pilot safety consists of the pilot burner, thermocouple and the pilot safety solenoid. The following videos show the operation and testing of the pilot safety. Early gas appliances used a chain of the above components to control the burner and provide a flame safety control.

When do you open the pilot valve on a gas furnace?

This valve is an electric solenoid that is opened when the thermostat calls for heat. Gas will move through to the burners if all other valves are open. 4. The pilot safety This part is a valve that is held open by an electric voltage produced by a pilot flame.

How does the main valve work on a gas furnace?

There are two different valve’s that work in time with each other to provide the right amount of gas to your furnace. The safety valve is what actually supplies the gas to the pilot light that will ignite the furnace burners during operation. The other valve, the main valve, is what permits gas to be delivered to the burners themselves.

How does a furnace gas valve work in a pilot light?

Without adequate heating of the thermocouple or thermopile, the furnace gas valve closes. As a result, this cuts off the supply of gas to the pilot light. Ultimately, the thermocouple acts as a safety mechanism that prevents gas buildup within the home. A 24 VAC transformer (or the thermopile) powers the main valve.

How does a forced air furnace work in a house?

Furnaces accomplish this by burning fuel internally to warm air, water or steam, then directing this warmth into various parts of a building to maintain a comfortable indoor temperature. Most furnaces are called forced-air furnaces because they direct heated air into different rooms with a blower.