Oil heat, explained.The manual for oil-heated homes.
What you can safely check yourself, when to stop and call a tech, and the part numbers and specs techs look up. Every guide lists where its facts come from.
Something is wrong right now
Start from what the burner is doing.
Look something up
Go straight to a reference tool.
Error codes Every documented light and code, control by control. Labeled parts diagrams Exploded views with the OEM number on every part. Parts by symptom Start from what it is doing and end at the part. Combustion chamber finder Your boiler or furnace to the Lynn kit that fits it. Nozzle chart Rated flow and your pump pressure into a real firing rate. Tank charts & oil-usage estimator Convert a gauge or stick reading to gallons by tank size and shape. On OilTankCharts.com
No heat & won't start
- Burner won't turn on Power, thermostat, and the first three things to check
- The reset button, press once Why once only, and what a lockout means
- Fires, then shuts off Short-cycling and cad-cell flame faults
- Blowing cold air Burner versus blower, and which is failing
- Ran out of oil What happens to the system, and how to restart
- Bleed the line after a run-out Clearing air from the fuel line, step by step
- The full decision chart The complete no-heat flow, start to finish
Tank & fuel
- Water in the oil tank How it gets there, and what it does to the burner
- Read your tank gauge Float gauges and turning a reading into gallons
- What is Bioheat? B5, B10, B20 and B100, and what each means
- Bioheat vs heating oil What changes for your equipment
- Heating oil vs diesel vs kerosene When a substitute is safe, and when it is not
- B20 blend problems Filters, gel point, and older systems
- Oil heat vs gas Cost, efficiency, equipment and safety, side by side
How it works & reference
- How an oil furnace or boiler works The burn cycle from thermostat to heat exchanger
- Pump prime mode, by control Technician reference: entry, time limit and exit for each primary
- Energy Kinetics System 2000 Owner's guide: the E140 light, the one-reset rule, and faults
- Burner specs by brand Beckett, Carlin, Riello, Wayne burner specs and codes
Upgrades & components
- Flare fittings on oil lines Why oil lines use flare and never compression, and how a flare is made
- Tigerloop de-aerator What it does and when it is worth adding
- Barometric damper Draft control and why it matters
- Oil safety (fire) valve The fusible valve on the fuel line
- Fuel oil filter Spin-on vs cartridge, and how to change one
- Smart thermostat & the C-wire Compatibility and the common wiring catch
- Hot water from a boiler Tankless coils versus indirect tanks
Why trust this site
Guides cite manufacturer documentation, NFPA 31, or EIA data. Every page is dated. Every hands-on guide draws a hard line between homeowner-safe checks and licensed-tech work.
More about this site →Prefer to see everything at once? Browse every page on the site, grouped by section.
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