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The two pages worth reading first.

• Home Where to start by symptom: no heat, a burner that will not stay lit, odours, run-outs, and what each repair should cost.
• About this site Who writes this, how the guides are sourced to manufacturer documentation, and where homeowner territory ends.

Troubleshooting guides

One guide per symptom. Each opens with the quick answer, then the checks that are safe without tools.

• All troubleshooting guides Every guide sorted by symptom, from no-heat and lockouts to fuel, tank, and cost questions.
• Bioheat vs heating oil: is it cheaper, cleaner, better? How Bioheat compares with No. 2 heating oil on cost, cleanliness, and BTUs, plus the Northeast blend mandates, answered honestly with sources.
• Energy Kinetics System 2000: owner's guide and problems An owner's guide to the Energy Kinetics System 2000 boiler: the model lineup, the E140/E150 codes, the one-reset rule, common problems, and what it costs.
• Furnace fires then shuts off: oil burner flame failure An oil burner that lights and dies seconds later is failing flame proving. What the cad cell does, what you can check, and why repeated retries are dangerous.
• Heating oil vs diesel vs kerosene: is it the same fuel? Can you burn diesel or kerosene in an oil furnace? How heating oil, diesel, kerosene, and Bioheat compare on BTUs, dye, tax, and what is legal.
• How does an oil furnace or boiler work? The full system A plain-language walk through an oil heating system: tank, pump, burner, nozzle, ignition, and flame-proving safety, and the sequence every cycle follows.
• How long do oil furnaces last? Lifespan and warning signs Realistic lifespans for oil furnaces, boilers, and tanks, what shortens them, the signs a unit is near the end, and the repair-or-replace call.
• How to bleed and prime an oil furnace after running out Why an oil line airlocks after running dry, how the bleed and prime are done at the pump, and the line between a job you can do and a service call.
• How to read an oil tank gauge (and why a stick beats it) How the float gauge on a heating oil tank works, how to read the fractions, the ways it lies, and the 30-second stick check that tells you the truth.
• Oil furnace blowing cold air: why, and what to check An oil furnace blowing cold air means the burner isn't firing while the blower runs, or the fan is set to ON. The checks, in order, and when to call a pro.
• Oil furnace maintenance: tune-up checklist and cost Oil furnace maintenance, demystified: every item a thorough annual tune-up covers, what each one prevents, typical pricing, and how to spot a drive-by visit.
• Oil furnace not turning on? Work this list before you call Oil furnace not turning on? The thermostat, switch, power, oil and lockout checks that are safe to run yourself, in the right order.
• Oil furnace replacement cost: new furnace and boiler prices Installed-price reality for replacing an oil furnace or boiler: equipment tiers, what a proper install includes, efficiency math, and a quote red-flag list.
• Oil furnace reset button: when to press it (just once) What the red reset button on your oil burner actually does, the one-press rule, and what to do when the burner locks out again.
• Oil furnace smells: is an oil smell in the house dangerous? How to read oil-furnace odors: the harmless first-start whiff, the oil smell that means a leak or misfire, and the soot situations that end with a phone call.
• Oil furnace troubleshooting chart: what to check, in order The master no-heat decision tree for oil furnaces and boilers: what to check in order, what each symptom means, and exactly where to stop and call a pro.
• Oil heat vs gas heat: an honest comparison Oil heat versus natural gas on cost, efficiency, equipment, safety, and practicality, without the sales pitch, and what matters when deciding whether to switch.
• Oil tank replacement cost: price and when a tank is done Real-world pricing to replace a 275-gallon oil tank: what's included, what adds cost, old-tank removal, and the signs a tank is on borrowed time.
• Pump prime mode, by oil primary control Technician reference: what pump prime does on Beckett GeniSys, Carlin and Honeywell primaries, how each control enters it, its time limit and how it ends.
• Ran out of heating oil? Here's the order of operations What actually happens when an oil tank runs dry, the diesel stopgap that buys you a weekend, and how the fuel line gets bled so the burner will fire again.
• Water in your oil tank: how it gets there and what to do Why water collects in a heating oil tank, the sludge and rust it causes, how to check for it with water-finding paste, and how to keep it out.
• What is Bioheat fuel? B5, B10, B20, and B100 explained Bioheat is biodiesel blended with ultra-low-sulfur heating oil: what the B-number means, the blend tiers, the standards, and the B20 problems to plan for.

Burner reference

Setup numbers, control codes, and per-brand specifics, sourced to the manufacturer manuals.

• Oil burner setup specs by brand Nozzle basis, pump pressure, electrode gap, cad-cell proving, and combustion targets, every value cited to a manual.
• Beckett burner: controls, specs and troubleshooting Status-light and lockout codes for the Beckett GeniSys 7505 (three lights) or GeniSys 7565/7585 (eight lights and an ACTION button). Many older installs still carry the Honeywell R7184 the 7505 replaced., model firing rates, electrode settings, and what a technician checks. Models: AFG, AF, AFII, NX.
• Carlin burner: controls, specs and troubleshooting Status-light and lockout codes for the Carlin 60200 (three lights) or Pro-X 70200 (screen); also the 40200, 42230 and 48245., model firing rates, electrode settings, and what a technician checks. Models: EZ-1, EZ-2, EZ-3, EZ-1-HP.
• Wayne burner: controls, specs and troubleshooting Status-light and lockout codes for the Honeywell/Resideo cad-cell primary: Wayne sells the R7284G as the MSR primary control, and an older burner may carry another Honeywell primary. Wayne does NOT use a proprietary flash-code control on residential gun burners, model firing rates, electrode settings, and what a technician checks. Models: MSR, M-SR, EHA, EHA-SR.
• Riello burner: controls, specs and troubleshooting Status-light and lockout codes for the Riello 530SE/C control box: the safety circuit and the ignition transformer in one plug-on module. Flame is proven by a photocell (a cad cell before 2019, a photodiode from 2019 on)., model firing rates, electrode settings, and what a technician checks. Models: 40 F3, 40 F5, 40 F10, 40 F15.
• Oil burner control error codes Decode the blinking status light on a primary control, by brand and control model.
• Nozzle chart and flow calculator Nozzle gallons-per-hour against pump pressure, with spray angle and pattern, for matching a nozzle to a rating plate.

Upgrades and components

What a component actually does, when replacing it is worth it, and what it should cost.

• All upgrades and components The component deep-dives in one list: de-aerator, damper, fire valve, filter, thermostat, and hot water.
• Barometric damper: what the draft regulator does The flue flap that holds draft steady, the difference between a clean fire and a sooty one.
• Flare fittings on oil lines: why not compression Why oil lines use flare fittings, not compression, and how a flare is made.
• Indirect water heater vs tankless coil on an oil boiler Two ways an oil boiler makes hot water, and why an indirect tank usually wins on efficiency.
• Oil furnace filter: spin-on vs cartridge, and changing it Cleaner fuel and a one-wrench change: the spin-on filter upgrade, plus how to change one.
• Oil safety valve: the Firomatic fusible-link fire shutoff The heat-activated fuel shutoff that closes the oil line automatically in a fire.
• Smart thermostat for an oil furnace: the C-wire catch Oil systems are simple two-wire heat calls, so most thermostats fit. The catch is the C wire.
• Tigerloop de-aerator: a one-pipe oil system that self-bleeds The de-aerator that stops air-lock lockouts and lets a one-pipe system self-bleed.

Parts

Matching a symptom or a model to the right part number.

• Parts by symptom Start from what the burner is doing and get the parts that actually cause it, grouped by failure mode.
• Beckett burner parts and diagrams Beckett oil burner parts for the AFG, the most common gun-style burner in North America, each on a labeled diagram with its OEM part number. R.W. Beckett parts are widely stocked.
• Riello burner parts and diagrams Riello burner parts for the 40 series F3 and F5, each on a labeled diagram with its OEM part number. The F3 and F5 share the same chassis (the F5 is the larger fire-rate), so most parts are common to both; the combustion-head parts vary by air-tube length.
• Carlin burner parts and diagrams Carlin oil burner parts for the EZ-1 (EZ-Pro) gun burner, on one labeled exploded view that covers the EZ-1/2/3. The combustion-head, electrode, and air-tube parts are sized by air-tube length.
• Wayne burner parts and diagrams Wayne oil burner parts for the MSR residential gun burner, on a labeled diagram with OEM numbers. Several parts (fan, gun assembly, air cone, air tube) are sized per the burner spec number on the rating plate, so confirm yours before ordering.
• Combustion chamber finder Pick your boiler or furnace and get the matching replacement chamber kit, across 38 brands and 55 kits. Every brand is also listed in full on the same page.

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