Lennox Furnace Troubleshooting. Not many things are worse than when your Lennox Furnace malfunctions during the wintertime, unfortunately,
you can’t exactly avoid an issue with your furnace, but by taking preventative measures from the get-go you can easily make repairs and replacements much less expensive.
Knowing what to expect from your heating system will also save you time and money, and ensure that if a breakdown happens your home is ready should anything interrupt your routine.
Lennox Furnace Troubleshooting
To troubleshoot some problems with Lennox Furnace, we discuss the following.
Lennox Furnace Blower Will Not Run
If the capacitor is not doing its job and is bad, the fan motor might be noisy, overheat, or not spin at all.
To determine if it really is the capacitor that’s causing you trouble, inspect it and see if it has burst.
If it looks like a balloon about to pop or has exploded, replace it immediately before attempting to use your device again. The capacitor can also be checked with a voltmeter.
The control board regulates the power supply to all of the components of the furnace and plays an essential role in making sure you get the proper voltage sent to the blower motor.
In case something happens to your furnace, you want to make sure there is a backup control board that can be installed within 24 hours by a professional because we want to prevent another catastrophe from happening.
Lennox Furnace Stops After Starting
The flame sensor detects when a flame is present in the burner and informs the control board of its presence.
If the flame sensor malfunctions, it fails to inform the control board of a flame’s absence when one is present.
Accordingly, the furnace shuts off power to prevent possible ignition of fumes inside the furnace. Occasionally, if a malfunctioning flame sensor does sense an ignitable gas, it might generate false alarms as well.
To troubleshoot this issue, inspect your flame sensor with a fine abrasive pad to clean away any obstructions that may be preventing proper detection of ignition.
If once cleaned this doesn’t fix your issue, replace your old sensor with a new one.
The pressure switch is closed when there’s sufficient airflow for ignition to occur.
If the switch isn’t working, the furnace might not ignite even if enough air is present in the combustion chamber thanks to an open pressure switch, leading to ignition problems. If ignition fails, you’ll need to replace the pressure sensor.
Lennox Furnace Is Making Noise
A blower motor’s bearings may need to be replaced over time. One way to determine if your motor is faulty is by listening closely.
If it begins making strange noises and grinding, which can impede efficiency, there’s something wrong with it.
Usually fixing this problem requires replacing the motor altogether but sometimes it can simply be cleaned or lubricated– we can help you figure out what the best solution is for your new home.
From the furnace, the air is blown throughout the house by the Blower Wheel. The Blower wheel is attached to the Blower Motor, which spins it.
If the Blower wheel is loose on the motor shaft, it will wobble as it spins causing a rattling sound that can be very loud inside the house.
First, you should check if the set screw on top of the blower wheel and motor are tightly secured. If not, go ahead and tighten them now.
Next, inspect both parts for damage or holes. If you find that there is a hole in either part go ahead and replace it right away.
Lennox Furnace Will Not Heat
The wall thermostat is a device used to monitor the temperature of the room. It is attached to the wall, and it has electrical contacts that control the power supply of the furnace.
These temperatures are controlled by a thermostat. If there is an issue with the electricity, this device will shut off.
To check if your thermostat has an issue controlling its electricity, use a multimeter to check for continuity. Without continuity, your wall thermostat will not troubleshoot properly, so replace it with what we have available.
The gas valve in a furnace is an important part of the combustion process. If the gas valve does not open, it cannot allow gas to come into the burner and fuel the fire.
You can determine if the gas valve needs replacement by testing it for continuity. If the gas valve fails to pass electricity through open or closed, replace it before proceeding.
Lennox Furnace Troubleshooting