Gas Furnace Repair

For fixing household items that are broken, you’ll need to understand how they work What can happen, what to do to find the issue and the steps for fixing it. Here’s what you must be aware of regarding repairs to your gas furnace.

What is it and how does it work?

Propane gas or natural gas that comes from an external source is piped into the furnace where it’s used to generate heat. The typical forced-air distribution system blows heated air through ducts that let out into different rooms of the home furnace cleaning service. Gas furnaces older than this use an ignition that is standing. Maintenance involves shutting off the pilot every spring and relighting it in the autumn. The latest gas furnaces that are more efficient make use of the electricity of a spark in order to ignite the gas whenever it is needed.

What could go wrong?

The majority of gas furnaces are reliable. What are the signs of issues? The furnace may not generate heat or produce enough heat. The pilot light might disappear repeatedly or refuse to come on. The thermocouple could be defective. The pilot might light but it will not start the burner. The furnace could be loud. There are some maintenance options and small repairs you can do. However, more extensive repairs is best reserved to a skilled technician.

Fix-It Tip

To prevent issues that may arise with your gas furnace every month, examine the air filter, and replace or clean it, if needed. Every year clean the blades of your blower and lubricate the motor and examine the belt.

What is the issue?

If there’s no warmth you can examine the electrical panel for a burned fuse or a tripped breaker. Light on the pilot light (see the next section).

If there isn’t enough heat, you can adjust the air shutter of the burner (see below) as well as clean the ports on the burner (see the next section).

In the event that your pilot’s light fails to blink or isn’t illuminated Clean the pilot’s orifice thoroughly using a toothpick. Then, check the thermocouple, and then replace the thermocouple if it’s damaged (see further below).

If the flame is flickering then alter your flame’s pilot (see further).

If there is an explosion sound as the burner starts to ignite it, you can set the pilot to a higher level and cleanse the pilot orifice as well as the ports for the burner.

If the burner takes longer than two seconds to fully ignite Clean the pilot orifice, and adjust your pilot’s light.

If the flame on the burner appears uneven Clean theĀ ac coil cleaning ports on the burner. If the flame on the burner is yellow, wash the burner, then open openings within the furnace in order to let additional air. Adjust the shutter of the burner to allow more air.

If your furnace is making an audible rumbling sound after turning off the burners Clean the burner and adjust the airflow shutter.

If your air is too dry, clean or change the pad of your evaporator, if you have a humidifier. examine the humidistat and then adjust the water-level float to increase the level of water.

If certain rooms are too cool while others are too hot the distribution system might need to be balanced. Check out the Forced-Air Distribution Fix-It Guide on

Repair-It Tip

Check that the filter you choose is the right size for the furnace you have.

What Materials, Parts and tools do I need?

Certain replacement parts that are used in gas furnaces are interchangeable (filters and fasteners) and can be purchased in your local hardware shop. Others, like the burners as well as controls need to be ordered from the manufacturer or an aftermarket retailer and/or through the heating equipment provider that is listed in your local phone book.

The most important tools you’ll require for fixing the gas furnace are these:




Wire brush

Multimeter What are the steps to Repair It?

To turn on the pilot in an active (always always on) ignition system Follow the lighting instructions found near the control. In other cases, follow these suggestions:

The pilot should be lit:

  1. Hold and press the knob on the pilot control to activate the pilot. Adjust the knob to the pilot’s position. Place a long match in the gas port for pilot.
  2. Control the knob and the pilot should begin to light. Keep the knob in place until the flame is glowing brightly (about 30 minutes). Release the pressure on the knob and then move it into the on position.
  3. If the pilot does not light after you turn off the knob control, you can try again by holding the control knob down for a longer period. If the pilot continues to go out, make sure you check your thermocouple (below).

Change the pilot

  1. Remove the cap that covers the pilot adjustment screw on the combination control.
  2. Adjust the screw clockwise in order to boost the intensity of flame, or clockwise to reduce it. It is adjusted correctly when the flame wraps around that bulb’s thermocouple by half an inch and appears to be dark blue, with a tiny yellow the tip.

Replace and test an thermocouple:

  1. Place the control knob on the pilot, then light the pilot, as described above.
  2. Unscrew the thermocouple fitting using an adjustable wrench.
  3. Set your multimeter to it’s DVC (lowest current) scale.
  4. Connect one multimeter lead to an end of the thermocouple closest to the pilot, and the second connect to the tube at the opposite end of the tube.
  5. If the multimeter displays any reading that is not zero The thermocouple is in operation. Replace the tube that is the thermocouple.
  6. If you do not see a reading, you’ll need change or wash the thermocouple using the steps 7 through 11.