Ways to Troubleshoot a Furnace Gas Valve

A furnace produces heat through a complex mechanism that involves combustion. Several components in the furnace regulate different parts of the process. One of these components is the gas valve. To troubleshoot a gas valve, you first have to know how it works and what function it plays.

What is a furnace gas valve?

The gas valve is an essential part of the fuel system. It is a quite simple device and is responsible for regulating the flow of gas into the burner. It allows gas into the ignition chamber to combust and generate heat. 

Signs your furnace may need repair.

Here are a few signs that indicate that something is wrong with your furnace, and furnace service Houston TX are required:

  • You have difficulty turning it on
  • Your furnace is not generating adequate heat
  • A loud whirring, buzzing, or gurgling noises are emanating from your furnace
  • Your furnace is not heating your home evenly
  • Your power bill has risen unexpectedly

Troubleshooting the gas valve

Now that you know whether your furnace requires repair, here’s how to check where the problem lies. If your furnace shuts down or stops generating heat, chances are, the problem lies with the gas valve. Perform the following checks to see if you have a bad gas valve-

  • Check if the motor is running. 
  • Check all the wires leading to the gas valve. If they are broken, frayed, or burnt, they need to be replaced. Wires are usually damaged in older furnaces.
  • Check the resistance of the coil at the gas valve using a multimeter. If the reading shows OL, then it means the coil is broken.
  • Check if the gas valve is correctly adjusted according to your furnace. At times, the technician performing the installation leaves the valve at the default setting, which can cause the ignition chamber to receive too much or too little gas, causing your system to malfunction.
  • Check the burners and make sure that they are not clogged.
  • Check if the flame sensors are working correctly.
  • Using a multimeter, check if the pressure is dropping across the inlet and outlet.
  • Check the evaporator coil and the blower motor. If they do not work properly, the system will shut down due to a safe trip.
  • Inspect the ductwork thoroughly and ensure that it is not clogged, especially the return duct.

If all the above components are functioning properly, you have a bad gas valve. It is possible to replace the gas valve by yourself, but it is not advisable as there is a chance you can unwittingly damage the furnace or get injured yourself. If the gas valve is broken or malfunctioning, it is best to contact a trustworthy professional for heating replacement Houston TX.

Alief Ultra Mechanical has over 30 years of experience with heating and cooling systems. Our skilled and experienced technicians provide a wide range of furnace services in Houston, TX, and surrounding areas. Contact us today to schedule an appointment for HVAC repair Houston, answer any questions, or get a free estimate.