An oil furnace is a dependable heating system, particularly in cold climates, but it can malfunction if air enters the fuel line. This is a typical problem after an oil outage or servicing, or an extended shutdown. Knowing how to bleed oil furnace systems the right way can bring the heat back on in a hurry and can prevent you from taking an unnecessary service call.
This procedure is what MileHi HVAC calls the ditch digger how-to guide. If you’re a homeowner aiming to get heat back or just someone looking to understand your system better, this guide has you covered from beginning to end, safely and with no surprises.
What Does Bleeding an Oil Furnace Mean?
Bleeding an oil furnace is a term used to describe the process of removing the air from the fuel line, making a clear path for the oil to go to the burner. Air in the line does not burn properly, which can lead to a lockout or the furnace not firing at all.
This problem is commonly caused by emptying an oil tank or after routine service. When air sneaks into the mix, it interrupts the constant flow of fuel required to run an engine. That’s why bleeding the system is necessary to enable the furnace to run again.
Bleeding the system is something that MileHi HVAC technicians have accomplished on numerous occasions while on winter service calls. It is a task that some homeowners can accomplish, but knowing what bleeding is all about may help you decide if you want to try it yourself or call an expert.
Common Signs Your Oil Furnace Needs Bleeding
There are a few signs to watch for that let you know air is trapped in your oil furnace system. One of the most telling signs is when the furnace tries to start, but then goes off on a trip repeatedly. This typically indicates that the fuel is not being properly delivered to the burner.
Another indication is that you may hear strange sputtering or gurgling sounds coming from the oil line. You might also see the furnace run momentarily and then go into lockout, even though the t-stat is calling for heat. These are often immediately following the tank being filled.
If these problems continue, MileHi HVAC suggests getting right on it! Consequences of ignoring air in the fuel line include burner damage and significant heating system downtime when temperatures are at their coldest.
Tools and Safety Precautions Before You Begin
Before beginning any furnace job, safety should always be your top concern. Handling oil heating systems is a matter of dealing with fuel, pressure, and ignition, so preparation is paramount.
You will also need a wrench, a small container, and a clean cloth. Have the area around the furnace well-ventilated, and keep any open flame or sparks away. It’s also highly recommended to wear gloves and safety glasses.
Do not continue with the process if you feel confused or unsafe at any time. MileHi HVAC advises homeowners to always prioritize safety when the temptation to save money is at an all-time high, especially when their heating equipment is involved.
You may read Why Does A Gas Furnace Stop Working?
Step-by-Step Process: How the Bleeding Works
Knowing the basics of the process helps you be more at ease when you have an oil furnace. First, find the oil burner bleed valve on the oil burner. This valve vents trapped air out as the oil starts flowing again.
Next, set a bucket under the valve to catch oil. Furnace Running: Loosen the valve a little on the oil burner with the furnace running on oil, let air and oil come out. When you tighten the valve, make sure there’s a good, steady stream of oil without bubbles.
This procedure is sometimes called bleeding oil furnace systems and should be performed with caution. Rushing or over-tightening parts may leak or break, which is why so many homeowners depend on MileHi HVAC and Plumbing!
How to Bleed an Oil Burner Without Causing Damage
Patience is your best friend when trying to bleed oil burner elements. Short cycling the system exacerbates the problem by causing the burner to lock out. Run the furnace while bleeding to allow air to vent out.
Just let it sit there for a couple of minutes if it stops up on you. This also helps protect the internal parts and prevent overheating. Don’t try to force the oil out too hard — it can put a lot of strain on the pump.
MileHi HVAC technicians are trained and equipped to efficiently bleed the system without stressing the system, which can be particularly important when working with older furnaces.
When and How to Reset the System
Sometimes the furnace doesn’t start even after bleeding it. Then you can reset the oil boiler controls only gently in that sense. A majority of systems come with a reset button on the burner control box.
Hit the reset button on the furnace only a single time, then wait for the furnace to see if it comes on. Hitting it a lot might pump oil into the combustion chamber, which could be a big safety hazard. Always execute this step with care.
If a reset doesn’t fix the problem, MileHi HVAC highly suggests an expert evaluation. Repeated lockouts can also be a symptom of other problems, not just air in the fuel line.
Common Mistakes Homeowners Should Avoid
One mistake I see a lot is trying to reset an oil furnace over and over again in rapid succession. This may cause accumulation of unburned oils and therefore a risk of smoking or damage.
Another mistake is to disregard small oil leaks after bleeding. Even a small leak can get worse over time and can cause efficiency or safety problems for your system. Always check the fittings when you are done.
MileHi HVAC is your service provider to assist you in correcting these mistakes and safeguarding the furnace so it will run safely through the heating season, saving you from unnecessary repairs and costly furnace replacements.
When to Call a Professional HVAC Technician
Some people can handle basic DIY tasks for bleeding their system, but there are times when it’s best to call in the professionals. If your furnace is still shutting off, has a strong smell, or is leaking visibly, it’s time to get professional help.
Authorized technicians can diagnose a fuel pump problem, a clogged fuel filter, or an oil burner problem — things that bleeding alone cannot cure. Trying to take a bite out of a big repair when you don’t really know what you’re doing may just make the problem worse.
Reliable MileHi HVAC is your best solution for fast, quality service, and whether it is keeping warm in the winter or cool in the summer, you will be taken care of, especially if you are having an Emergency in the Cold Weather.
Benefits of Proper Furnace Maintenance
Maintenance also minimizes the risk of air getting into the fuel line and your furnace running inefficiently. Clean filters, tight connections, and regular maintenance keep the heat flowing.
Proper maintenance also results in better fuel efficiency, reduced heating bills, and a longer system life. Little preventive actions can have a huge impact in the long run.
MileHi HVAC stresses that servicing is the best protection against mid-winter breakdowns and provides peace of mind all winter long.
Conclusion
Knowing how to bleed oil furnace systems can help restore heat after running out of oil, but it requires caution, patience, and safety. For those without experience or previous furnace issues, professional help is essential. At MileHi HVAC, we offer reliable HVAC services in Denver to keep your heating system efficient, safe, and dependable. From routine maintenance to urgent repairs, our certified technicians have you covered. Call MileHi HVAC today and ensure your home stays warm and comfortable all year long.
Frequently Asked Questions (FAQs)
What is the time needed to bleed an oil furnace?
This can be done smoothly in 10 to 15 minutes for those experienced with no hassles from the system.
Can I bleed my oil furnace at home?
Household tools can be used, but the potential for leaks or the system freezing is much higher without experience.
Is it safe to bleed the oil furnace on my own?
It certainly can be safe if done right, but I would always recommend you get professional help for your first time.
After bleeding, why does my furnace lock out?
This is often the result of residual air in the line or the way resetting was handled.
How often should I have my oil furnace serviced?
Oil furnaces should be serviced yearly to keep them performing safely and efficiently.
