Beckett oil burner: troubleshooting, controls & specs

Name: Beckett oil burner: controls, specs & troubleshooting
Creator: OilBurnerHelp

R.W. Beckett Corporation (North Ridgeville, Ohio, founded 1937) makes the most common residential oil burners in North America; the AF/AFG is the workhorse line, and this page decodes its control lights, lists the sourced setup specs, and shows what a technician checks.

Beckett AFG oil burner: black motor and blower beside the white burner housing, the control box on top and the Beckett name on the label — A Beckett AFG. The white housing with the Beckett label and the black motor beside it are the tells.

Replacing something rather than diagnosing it? See the Beckett parts diagrams & part numbers.

Some links on this page are affiliate links: as an Amazon Associate this site earns from qualifying purchases, and it may earn from other retail partners, at no extra cost to you. Parts shown are general references, not specific endorsements. Match any part to your unit's make, model, and spec before buying.

Control lights & lockout codes

GeniSys 7505 / 7505B

Beckett GeniSys 7505 oil primary control: black box with a white label, a red reset button and small status lights — Beckett GeniSys 7505: the red button is the reset, and the small lights beside it tell the story.

Three lights: a red light in the reset button, a green light and a yellow light. Read which light is on and whether it is steady or flashing. There is no blink count.

Indication	What it means
Red light flashing	Soft lockout. The burner shut down on safety. The usual reasons are no flame during the trial for ignition, flame seen when there should be none, or flame lost while running. Press the reset button once, about one second. If it locks out again, stop and call.
Red light steady ON	Hard (restricted) lockout. The control locked out repeatedly, or failed its relay check, and stopped to keep unburned oil out of the chamber. A technician has to find the cause first. The reset is a 15 second hold of the button until the red light goes out and the yellow light comes on.
Green light flashing	Recycle. Flame was lost while the burner was running. The control waits about 60 seconds and tries again on its own. Repeated recycles end in lockout.
Green light steady ON	Flame sensed. This is the normal running light. If it is on while the burner is idle, the cad cell may be seeing stray light.
Yellow light steady ON	Pump prime mode, or the reset button has been held 15 seconds or more. Not a fault. The yellow light goes out when priming ends or the button is released.

Source: R.W. Beckett GeniSys 7505 Installation & Operation Manual, Form 61649 (beckettcorp.com)

Replacement control: 7505A0000U Amazon ↗ Pro install Confirm the part-number suffix against the control on your burner. Often with: nozzle, pump strainer (in the tune-up kit), cad cell

GeniSys 7565 / 7585 (advanced)

Beckett GeniSys 7565 oil primary control: black box with a white label, a row of eight named lights and a red ACTION button along the bottom — Beckett GeniSys 7565: the row of named lights and the ACTION button.

Eight named lights in a row (TT, LIM, MTR, IGN, VLV, FLM, AIR, SYS) and an ACTION button in place of a plain reset. Green is normal. Red is a fault. Yellow is a special state. SYS is the overall status light. The VLV and AIR lights only work when a valve or an air switch is installed.

Indication	What it means
SYS green	Power on.
SYS yellow, steady	Pump prime mode. The motor, igniter and valve run for the prime window. Not a fault.
SYS yellow, flashing	Recycle. Flame was lost, or a pressure or spill switch opened while firing. The control waits about 60 seconds and tries again, up to three times.
SYS red, flashing	Soft lockout. Press the ACTION button once, about one second. If it locks out again, stop and call.
SYS red, steady	Hard (restricted) lockout. The control kept locking out, or failed its relay check, and stopped to keep unburned oil out of the chamber. A technician finds the cause first. The reset is a 15 second hold of the ACTION button.
FLM green	Flame present.
FLM red	No flame detected.
FLM yellow	Flame seen out of sequence, or a shorted cad cell.
AIR green	The installed air switches are closed.
AIR red	Blocked flue.
AIR yellow	Inlet air fault.
MTR, IGN or VLV red	A fault on that part: the motor, the igniter or the oil valve.
TT green	The thermostat is calling for heat.
LIM green	The limit circuit is closed.

Source: R.W. Beckett GeniSys 7565/7585 manual, Form 62255-001 (beckettcorp.com).

See the full error-code database for every control.

Common Beckett replacement parts

Installing burner parts and setting combustion is licensed-technician work; these numbers are for sourcing the right part. The first row is the complete burner, for a replacement or a spare; match the model, the air tube length and the firing rate to the appliance.

Part	OEM #	Shop
Beckett AFG burner, complete	AFG	Amazon ↗
Cad cell flame sensor	7006U	Amazon ↗
Electrode kit ('F' head)	5780	Amazon ↗
Primary control (GeniSys)	7505A0000U	Amazon ↗

All Beckett parts, with diagrams →

Models & setup specs

Primary control: 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.

A fuel line below that names a B-number is a biodiesel blend rating: see what the Bioheat B-numbers mean and B20 problems: gelling, filter clogs, and old equipment.

AF / AFG

Flame-retention gun burner (the workhorse residential line; AFG is the flame-retention version of the AF chassis).

Firing rate: 0.40 to 3.00 GPH (about 56,000 to 420,000 BTU/hr input).

Motor: 1/7 HP, 3450 RPM, PSC (permanent split capacitor).

Ignition: Beckett solid-state igniter (PowerLight), 10,000 V secondary.

Fuel: No. 1 or No. 2 heating oil; AF/AFG is UL-listed up to B100 biodiesel / renewable diesel.

Pump pressure: Default fuel-unit pressure 100 psig unless the appliance specifies otherwise.

Source: beckettcorp.com AF/AFG product page; AF/AFG Burner Manual Form 6104 (default 100 psig confirmed in Form 6104).

AFII

Compact flame-retention gun burner for the low end of the residential range (separate chassis from AFG, not a replacement for it).

Firing rate: 0.40 to 1.50 GPH total (AFII-85 head 0.40-0.85 GPH; AFII-150 head 0.75-1.50 GPH).

Motor: 1/7 HP, 3450 RPM, capacitor-start with automatic-reset overload; motor is unique to the AFII chassis.

Pump pressure: 140 psig by design (higher than the AFG default).

Source: Beckett bulletin 'Getting to Know the Model AFII Burners' (beckettcorp.com); AFII manual Form 6104BAFII.

NX

Newer-generation residential flame-retention burner; combines air and head into a single adjustment.

Firing rate: 0.40 to 1.75 GPH (about 56,000 to 280,000 BTU/hr).

Motor: 3450 RPM, NEMA M-flange, 120V/60Hz/1ph, 2.0 A max (HP not stated on the Beckett product page - unresolved).

Ignition: Continuous-duty solid-state igniter.

Fuel: No. 1 or No. 2 heating oil only (NX is NOT rated for renewable fuels, unlike the AFG).

Source: beckettcorp.com NX product page (product sheet 61648).

SF

Higher-output residential / light-commercial flame-retention burner sharing AF design features.

Firing rate: 1.25 to 5.50 GPH (about 175,000 to 770,000 BTU/hr).

Motor: 1/4 HP, 3450 RPM, split-phase, manual-reset overload, continuous duty.

Ignition: 10,000 V / 23 mA wound transformer (not solid-state).

Fuel: No. 1 or No. 2 heating oil only.

Source: beckettcorp.com SF product page.

SR

Residential flame-retention burner with F-style retention head; shares Beckett's standard electrode setting with AF/AFG/SF/SM.

Firing rate: 0.85 to 1.50 GPH (from Beckett electrode-bulletin context; dedicated SR spec page not retrieved - treat upper/lower bound as unresolved).

Source: beckettcorp.com 'Standardizing Electrode Settings' bulletin context (firing range unresolved from a dedicated SR page).

Electrode setting

Electrode gap and position are among the checks in the annual tune-up checklist.

Source: Beckett bulletin 'Standardizing Electrode Settings' (May 15, 2002), beckettcorp.com. The Beckett Z gauge sets all three at once.

What a technician checks

The most common burner in North America. The GeniSys 7505 reports with a red light in the reset button plus a green and a yellow light. A soft lockout clears with a one second press. A hard (restricted) lockout needs a 15 second hold, and the cause should be found first. There is no blink count. The 7565 and 7585 have a row of eight named lights (TT, LIM, MTR, IGN, VLV, FLM, AIR, SYS) and an ACTION button.

Where to go next

Brand reference source: R.W. Beckett GeniSys 7505 manual (Form 61649 / spec Form 61658); GeniSys 7565/7585 manual Form 62255-001.

https://oilburnerhelp.com/burners/beckett/