Skip to Content

Carrier Furnace Not Getting Gas? 4 Common Causes (+ Fixes)

Your Carrier furnace relies on gas to ignite the burners and keep your house warm. Thankfully, the reason your furnace isn’t getting gas is usually nothing serious.

Your Carrier furnace isn’t getting gas because the gas supply or gas valve is closed, the ignition sensor is faulty, or the pilot light is dirty. You can fix the problem by ensuring all gas valves are open and that the ignition sensor and pilot light are clean and working correctly.

The rest of this article will discuss common reasons behind your Carrier furnace not getting gas. We’ll also go over the ways to fix each issue. Let’s dive right into it!

Closed Gas Supply

We tend to overlook some of the most superficial causes. Yet, you can save yourself a lot of effort by there.

When your Carrier furnace isn’t getting any gas, the gas supply is the first thing to check. Perhaps you turned the gas off at the start of summer. Winter came, yet you forgot to open the gas supply. The gas canister usually has a valve that you can turn on or off. If you use a natural gas source, there should be a switch that controls the gas flow for your house.

How To Fix

Locate the gas supply system. It’s either an underground pipe running to your home or a large gas canister next to or inside the furnace.

Check the valve that controls the gas supply. If the valve is closed, you’ve found your problem. Turn it on and test the furnace. 

Hint: While inspecting the gas supply, ensure the gas pipe is tightly fastened to the gas supply. 

Closed Gas Valve

In addition to checking the gas supply, you should check the valve inside the furnace. The furnace’s gas valve is a small device that connects directly to the gas supply line outside. Gas flows into the furnace when the valve opens up. This action happens automatically — there’s a sensor that detects a flame and calls for the gas valve to open. 

There’s a small switch on the gas valve that you can use to control it. The gas valve won’t open up when the furnace calls for gas when the switch is closed. In addition to this switch, the gas valve can be damaged too. In some cases, an object is pushing against the valve, blocking the flow.

How To Fix

Here’s how to open the gas valve in your Carrier furnace:

  1. Turn off your furnace at the breaker box.
  2. Open the main compartment of your furnace.
  3. Identify the gas supply line and follow it to find a small box attached to the pipe. This is the gas valve. 
  4. See if the switch on the gas valve is open. If it isn’t, then flip it over.
  5. If the gas valve is already open, see if you can find any signs of damage, such as cracks and bends.

Here’s a video showing you how to replace the gas valve on a Carrier furnace:

Faulty Ignition Sensor

When you turn the furnace on, the ignition sensor checks for ignition and a flame; if nothing is detected, it signals the gas valve to close. The ignition sensor is also called the flame sensor.

If the ignition sensor is dirty or damaged, you may run into various problems with the furnace. This happens because the sensor isn’t telling the gas valve to open to provide the furnace with gas. 

In most cases, the sensor is just dirty. Combustion gases cause soot to accumulate on the sensor. As soot builds up, it can cause problems with the sensor. While debris is a relatively common issue, there are times when the sensor is broken, in which case the only way forward is to replace the part. 

How To Fix

This is another task that requires you to work inside the furnace:

  1. Turn off the furnace’s power.
  2. Open the main compartment.
  3. Find the ignition sensor. The sensor is attached to a metal rod fastened to a hole in the combustion chamber.
  4. Remove the sensor.
  5. Clean the sensor using fine sandpaper and a microfiber cloth.
  6. While cleaning, check for cracks in the sensor. If there are cracks, it needs to be replaced. But if it seems to be in good condition, place it back after a thorough clean. 

If you need some visual guidance on cleaning the sensor, watch the video below:

Dirty Pilot Light

Another possible reason your Carrier furnace isn’t getting gas is a dirty or faulty pilot light. The pilot light has a constant flame that ignites the gas coming from the burners. It’s only used in older furnaces, as newer models have electric ignitors.

If the pilot light is dirty or unlit, it can’t ignite the gas. The flame sensor won’t detect anything, and the gas valve will remain closed. 

How To Fix

You can check the pilot light from the outside of your Carrier furnace. Check if the pilot light is burning. If not, shut off your furnace and clean the pilot light. After that, use a lighter to get a flame going.


A Carrier furnace not getting gas often means the gas valve can’t open. This problem could also be related to the pilot light, flame sensor, or gas supply. Consider all possible causes to pin down the reason and fix it.