Safe-T-Beam sensor fault
A Genie opener blinking its red LED four times means the Safe-T-Beam photo-eye system is the problem — the beam is blocked, the eyes are misaligned, or there's a wiring fault, and the opener won't close normally until it's restored. This is Genie's equivalent of the LiftMaster sensor codes, and it's the single most common Genie fault people run into.
Almost always a DIY fix: clear the door opening, wipe both lenses, and aim the eyes until the source LED (red) and the receiver LED (green) both glow solid. Then follow the low-voltage wire run back to the motor head looking for staple damage. Realigning the Safe-T-Beam eyes clears most four-blink codes for free — bring in a tech only when a sensor unit has actually failed or the wiring is damaged behind a wall.
- Meaning
- Genie's Safe-T-Beam photo-eye system is blocked, misaligned, or has a wiring fault — the opener won't close normally until the beam is restored.
- Likely fix
- Clear the opening, wipe both lenses, and align the eyes until the source LED (red) and receiver LED (green) are both solid. Then inspect the low-voltage wire run to the motor head.
- DIY or pro
- DIY-friendly — Safe-T-Beam alignment is the most common Genie fix. Pro if a sensor unit has failed.
Code tables vary by model year — confirm against your model's manual (model number is on the motor head, under the light lens). Unplug the opener before touching any wiring.
Frequently Asked Questions
How do I reset the Safe-T-Beam on a Genie opener?
There's no button reset — you clear the four-blink Safe-T-Beam fault by restoring the beam. Clear anything in the door opening, wipe both lenses, and aim the two eyes at each other until the source LED glows solid red and the receiver LED glows solid green. Steady lights on both means the beam is made and the opener will close normally. If a light stays off or blinks after careful alignment, check the wire run to the motor head for staple damage.
What do the Genie Safe-T-Beam LED colors mean?
The source (sending) eye shows a steady red LED, which just means it has power. The receiver eye shows a steady green LED when it can see the source beam — that's your "aligned and working" signal. A blinking or dark receiver LED means the beam is broken: something is in the path, the eyes are misaligned, or there's a wiring fault. Aim the eyes until both lights are solid to clear the four-blink code.
Check another — Select your opener's flash pattern
Use the Garage Door Opener Blink Code Decoder to check any other option, or jump straight to one of these:
- LiftMaster/Chamberlain — 1 up-arrow, 1 down-arrow flash
- LiftMaster/Chamberlain — 1 up-arrow, 2 down-arrow flashes
- LiftMaster/Chamberlain — 1 up-arrow, 3 down-arrow flashes
- LiftMaster/Chamberlain — 1 up-arrow, 4 down-arrow flashes
- LiftMaster/Chamberlain — 1 up-arrow, 5 down-arrow flashes
- LiftMaster/Chamberlain — 1 up-arrow, 6 down-arrow flashes
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