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LED RT 2x
Hörmann LED RT 2x garage door opener: SE safety device trip
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
If the red LED RT on your Hörmann RotaMatic, RotaMatic P, or RotaMatic PL hinged gate control flashes twice (LED RT 2x), the SE safety/protective device has responded. Clear the gate path without jumpering any terminals and acknowledge with your transmitter.
Safety first
Stop and check this first
- Never install a wire jumper between terminals 20 and 72/73 to bypass a connected, faulty SE photocell or safety device: doing so disables entrapment and impact protection.
- Before performing any work on the RotaMatic gate system, disconnect both the mains plug and any emergency battery plug and safeguard the system against unauthorized switching on.
Safe checks you can perform
- Confirm the red LED RT flashes 2 times between pauses
- Clear the gate swing area and check the exterior of the SE photocells
- Acknowledge the error with the button or radio hand transmitter
Leave these tasks to a qualified professional
- Do not attempt this professional task: Inspect and test the SE safety/protective device and terminals 20 and 72/73
- Do not attempt this professional task: Verify error acknowledgement and monthly safety protective functions
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Inspect and test the SE safety/protective device and terminals 20 and 72/73
What they doAfter disconnecting the mains plug and any emergency battery plug, the qualified technician tests the SE safety/protective device and inspects its wiring at terminals 20 and 72/73 on the RotaMatic control board.
They must show youproper operation of the SE safety/protective device at the control board and clearance of the 2x red LED RT flashes.
In writingRotaMatic/P/PL model, inspection or replacement of the SE device, and terminal 20 to 72/73 circuit check.
Verify error acknowledgement and monthly safety protective functions
What they doOnce the SE fault cause is rectified, the specialist acknowledges the error via transmitter or impulse button (section 9.10) and tests all safety and protective functions of the hinged gate system (section 10).
They must show youerror deletion on command impulse and immediate gate stop or reversal when the SE safety device is triggered.
In writingcompleted SE protective function test and normal gate travel without LED RT 2x.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Confirm the red LED RT flashes 2 times between pauses
- Who:
- you, viewing the LED RT indicator on the Hörmann RotaMatic control without touching live terminals.
- How:
- count the flashes of the red LED RT between pauses to verify that it flashes 2 times (Flashes 2x) rather than 3, 4, 5, or 6 times.
- Result that matters:
- confirm that the diagnostic display is reporting a response from the SE safety/protective circuit.
- If the red LED RT flashes a count other than 2x:
- match the exact flash count in section 9.9.2 before proceeding.
- If you confirm 2 repeated flashes on LED RT:
- inspect the swing gate travel area and exterior safety photocells next.
- Evidence to keep:
- confirmed count of 2 flashes on the red LED RT and the stopped position of the gate leaves.
Evidence: Hörmann RotaMatic, RotaMatic P and RotaMatic PL Hinged Gate Operator Instructions (TR10A077)
Clear the gate swing area and check the exterior of the SE photocells
- Who:
- you, with the hinged gate stationary and without bypassing or dismantling any safety device.
- How:
- remove any object in the gate travel area and check that the outer lenses of the safety photocell or protective device (SE) are clean and unobstructed.
- Result that matters:
- remove external beam interruptions that keep the SE protective device actuated without opening internal wiring.
- If clearing an obstruction or dirty lens restores a clear path:
- perform the section 9.10 error acknowledgement step.
- If the gate area and lenses are clear but the fault remains:
- try acknowledging once, and if it persists, contact a specialist.
- Evidence to keep:
- unobstructed gate swing zone and exterior condition of the SE safety device lenses.
Evidence: Hörmann RotaMatic, RotaMatic P and RotaMatic PL Hinged Gate Operator Instructions (TR10A077)
Acknowledge the error with the button or radio hand transmitter
- Who:
- you, keeping the entire gate area in view and clear of people, pets, and vehicles.
- How:
- after eliminating the cause of the trip, press the internal or external impulse button or actuate the radio hand transmitter as specified in section 9.10 to delete the error and start travel.
- Result that matters:
- verify whether the documented acknowledgement command clears LED RT 2x once the safety path is free.
- If pressing the button or transmitter deletes the error and the gate travels normally:
- retain the test outcome.
- If LED RT flashes 2x again and the gate will not move:
- do not jumper terminals 20 and 72/73, and have a qualified RotaMatic technician inspect the SE circuit.
- Evidence to keep:
- gate response when acknowledging the error with the button or radio hand transmitter.
Evidence: Hörmann RotaMatic, RotaMatic P and RotaMatic PL Hinged Gate Operator Instructions (TR10A077)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Networks
- Brand
- Hörmann
- Product type
- Garage door openers
Known code variants
- Dispositivo SE RotaMatic
- LED RT 2 destellos
- LED RT flashes 2x
- LED RT parpadea 2x
- Red LED RT 2 flashes
- RotaMatic LED rojo 2 veces
- RotaMatic LED RT 2x
- SE safety device responded
What it means
Hörmann's Fitting, Operating and Maintenance Instructions (TR10A077) for the RotaMatic, RotaMatic P, and RotaMatic PL hinged gate operators state in section 9.9.2 that 2 flashes on the red LED RT (Flashes 2x) mean the SE safety/protective device has responded. Listed causes are an actuated safety/protective device, a defective safety/protective device, or, only on setups without an SE device, a missing wire jumper between terminals 20 and 72/73. Other Hörmann operators may differ. LED RT 2x by itself never proves that the photocell or control board has failed.
Warnings and stop conditions
- Highsource verified
Never install a wire jumper between terminals 20 and 72/73 to bypass a connected, faulty SE photocell or safety device: doing so disables entrapment and impact protection.
Evidence: Hörmann RotaMatic, RotaMatic P and RotaMatic PL Hinged Gate Operator Instructions (TR10A077)
- Highsource verified
Before performing any work on the RotaMatic gate system, disconnect both the mains plug and any emergency battery plug and safeguard the system against unauthorized switching on.
Evidence: Hörmann RotaMatic, RotaMatic P and RotaMatic PL Hinged Gate Operator Instructions (TR10A077)
Symptoms and causes
Probable causes · in order
- SE safety or protective device actuated by an obstacle in the gate zoneCommon
Section 9.9.2 of the Hörmann RotaMatic manual lists actuation of the safety/protective device (SE) as the primary cause when the red LED RT flashes twice.
Evidence: Hörmann RotaMatic, RotaMatic P and RotaMatic PL Hinged Gate Operator Instructions (TR10A077)
- Defective SE protective device or open circuit at terminals 20 and 72/73Possible
Hörmann also notes that LED RT 2x occurs if the connected safety/protective device is defective or, in installations configured without an SE device, if the jumper between terminals 20 and 72/73 is missing.
Evidence: Hörmann RotaMatic, RotaMatic P and RotaMatic PL Hinged Gate Operator Instructions (TR10A077)
Virtual technician
Does LED RT 2x still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Hörmann RotaMatic, RotaMatic P and RotaMatic PL Hinged Gate Operator Instructions (TR10A077)
Hörmann KG Verkaufsgesellschaft · 2026 · official_doc
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