Common Waste Oil Furnace Problems & Troubleshooting

Tuesday, 16 August 2022 19:17

Waste oil furnaces might seem like very complex devices, but with the right support, anyone can understand them. We’ve developed a helpful guide for waste oil furnaces troubleshooting that should help make your maintenance a little easier for you.

Waste oil furnaces require maintenance and attention to ensure they operate efficiently and safely. If you notice any issues while operating your used oil furnace, it’s important to fix them immediately. Otherwise, you could end up spending extra money on repairs or a whole unit replacement down the line.

What to Know About Waste Oil Furnaces Troubleshooting

Here are some common waste oil furnaces troubleshooting tips and solutions.

Used Oil Furnace Problems

In most cases, there will be no problems with your waste oil furnace. If it does start having issues, however, you'll want to take steps to resolve the problem as soon as possible to keep it operating efficiently all year round. There are many reasons why your oil furnace could be malfunctioning, including:

  • A clogged filter

  • Overheating

  • Too much oil being used

  • Improper maintenance

  • Faulty wiring

  • Dirty air filters

  • And more

How to Identify the Causes of Unusual Sounds in Your Unit and Fix Them

You can generally expect your used oil heater to make some noise while in use. However, you may hear some strange noises from time to time.

Unusual sounds coming out of your waste oil heating system can mean many things. From knocking, rattling, and squeals, to humming, whistles, and grinding, there are several possible causes of these unusual sounds. If you hear one of these noises while your unit is in use, it's important to know how to identify the cause of the noise and fix it. Here are some of the most common types of sounds you may hear while performing waste oil furnace troubleshooting.


This is usually caused by loose parts inside your furnace. Loose connections or broken wires can lead to knocking. You can check your furnace manual to see if any specific repairs are listed for knocking noises.


Rattling sounds can come from loose connections or worn bearings. A loose connection can occur when a wire becomes disconnected or frayed due to overuse. Worn bearings can wear down over time due to friction and heat. To repair this issue, you'll want to replace the bearing or reconnect the wire.

Squealing noises

Squealing sounds can be caused by anything from loose connections to worn bearings (similar to rattling noises). When a bearing wears down, it creates a loud screeching sound. To prevent this, you'll want to tighten up the bearings and ensure your internal parts are not loose.


Humming sounds can be caused by a variety of issues. If you notice a hum while the unit is running, chances are it's because the blower motor isn't spinning fast enough. To fix this, you'll want a professional Clean Burn technician to look into the situation.


Whistles and grinding sounds can both be signs of a malfunctioning fan blade. If you hear either of these sounds, call a professional immediately.

What to do When the Furnace Suddenly Shuts Off

If your wase oil furnace suddenly shuts off, we suggested checking the settings on the thermo­stat to see if they were set properly. We also suggest looking at the fuel level because if there isn't enough fuel, the furnace won't start.

If those solutions don’t work, then it’s time to call in the pros

Do You Need Help Troubleshooting Your Used Oil Furnace Issues?

Even though waste oil furnaces can require some troubleshooting they are normally an awesome investment for your business. At Interstate Energy, we are the only authorized Clean Burn distributor in Colorado and eastern Wyoming. We can help with all of your used oil furnace maintenance needs and can help you troubleshoot any issues.

Contact Interstate to schedule your waste oil furnace service today!