The furnace gas valve operates by electromagnets. The primary valve — also known as the safety valve — supplies gas to the pilot light. The second valve — also known as the main valve — allows gas to flow to the burner trays. The thermocouple (or thermopile) generates the power holds the safety valve open.
What does a furnace gas valve do?
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.
What is a smart valve on a furnace?
The Smart Valve system uses a 24 VAC powered hot surface pilot gas igniter to ignite the pilot gas. The main gas is ignited in both instances by a pilot gas burner. The Smart Valve system is self-contained, thus eliminating the need for a separately mounted ignition source, usually in the furnace or boiler vestibule.
Where is the shut off valve for a gas furnace?
With a furnace, the gas valve is often located near the bottom of the appliance; if your gas furnace has a pilot light, its gas shut-off valve should be close to that device. If you don’t see your valve, your furnace owner’s manual can help provide guidance.
How do you reset the gas valve on a furnace?
If the furnace doesn’t have a power switch you can turn off, turn off the circuit breaker controlling the furnace, open the blower housing and locate the reset button on the side of the blower motor. Press it in until it clicks and then restore power to the furnace by turning the breaker back on.
How do I know if my gas control valve is bad?
If the gas valve is stuck or otherwise malfunctioning, your furnace may shut down completely or just stop delivering warm air. There are other issues that may cause the same symptom, so you need an experienced technician to diagnose the problem and apply the proper repair.
How do you test a furnace smart valve?
Youtube quote:And measure it on any ground on the furnace you're going to measure the same power right here you have 28 volts coming into the smart valve.
What causes gas valve failure?
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 causes furnace not to ignite?
Common types of natural gas issues include gas leaks, blocked gas lines, and malfunctioning gas valves. If the gas line is off, simply turn it back on. If the furnace won’t ignite after doing this, call an HVAC professional to check for other potential problems.
How do I free a stuck gas valve?
Youtube quote:Put the gasket.
How much does it cost to replace a gas valve on a furnace?
$300 to $750 dollars
Average Cost To Replace the Gas Valve on Your Furnace? According to sites like Home Advisor and CostEstimates.com, replacing the gas valve on your furnace can cost anywhere from $300 to $750 dollars. This includes the part itself and the services of an HVAC professional.
How do you free up a stuck gas valve?
Heres how; First, turn off the gas in the house so you don’t blow yourself up or cause a disaster, loosen the bottom nut, tap the bottom of the plug upward to loosen the tapered plug, remove the tapered plug, lubricate with a special gas valve grease , and re-install the plug, job done.
Can you clean a gas valve on a furnace?
Turn off electrical power and shut the furnace gas valve. Use a medium-bristled brush to sweep content off each burner and sweep out the combustion chamber as best you can. Use a straw or compressed air to blow dust and dirt off the pilot light assembly or hot surface ignitor, as well as the flame sensor.
How do you fix a gas control valve?
Youtube quote:Now the gas control valve is not connected to the burner assembly. Okay. So what we're going to do now is unscrew the burner assembly. So we can take it off be real careful not to lose your. Screws.
What is a gas control valve?
Gas valves, also called control valves, are important to ensure the correct operation and safety of your gas appliance. A gas valve works by controlling the pressure and amount of gas flowing into the appliance, creating a steady flow without room for leaks.
Are gas valves interchangeable?
Furnace gas valves are interchangeable if there are two wires seen on the valve. If two or more exist, it is advised to take a picture of the valve and pick up a replacement. If there is a problem you notice with the valve on the furnace, cut the gas off from the mainline.
Is there a universal gas valve for furnace?
intermittent pilot, direct spark ignition, and hot surface pilot ignition. It is a 3/4” x 3/4” valve but comes with reducer bushings to fit 1/2” applications. An LP conversion kit is also included with the valve.
Are water heater gas valves universal?
Natural and propane water heater gas valves are not interchangeable, so, be sure to order a valve for your type of gas.
