- Networks
- DSL routers
LUZ-ROJA
BT LUZ-ROJA on Smart Hub: the hub detects a problem
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
A red light on the BT Smart Hub 2 means there is a problem somewhere. Turn the hub off with the power button and back on; if it does not turn blue, BT's next step is a factory reset.
Safety first
Stop and check this first
- A factory reset returns the hub to its original settings: you lose any changes you made, such as a custom Wi-Fi name or password.
Safe checks you can perform
- Turn the hub off and on
- Note your settings before a reset
- Factory reset with a paper clip
- Call BT next to the hub
Leave these tasks to a qualified professional
- Do not attempt this professional task: Remote tests of the hub and line
- Do not attempt this professional task: Hub replacement only after diagnosis
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.
Remote tests of the hub and line
What they doBT runs tests with the hub on and your device connected.
They must show youthe hub and line test results.
In writingthe cause they identify and the fix.
Hub replacement only after diagnosis
What they doIf the tests point to the hub, BT sends a new one.
They must show youthe test that points to the hub.
In writingthe equipment replaced and why.
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.
Turn the hub off and on
- Who:
- you.
- How:
- Press the power button to turn the hub off and press it again to turn it on. Wait for startup to finish.
- Result that matters:
- Whether the light turns blue.
- If it is blue:
- it was a passing fault.
- If red returns:
- a restart is not enough; consider the factory reset.
- Evidence to keep:
- Time of the restart and final colour.
Evidence: What do the lights on my BT Hub or Complete Wi-Fi device mean?
Note your settings before a reset
- Who:
- you.
- How:
- Before resetting, write down your Wi-Fi network name and password and any setting you changed on the hub.
- Result that matters:
- Having those details saved outside the hub.
- If you have them:
- you can go on to the reset.
- If you cannot find them:
- call BT first and ask whether the reset is needed.
- Evidence to keep:
- The note with your settings.
Evidence: What do the lights on my BT Hub or Complete Wi-Fi device mean?
Factory reset with a paper clip
- Who:
- you, only if the restart did not work.
- How:
- With a paper clip, press the hub's Factory Reset button as BT describes and wait for it to start again.
- Result that matters:
- Whether the light turns blue.
- If it is blue:
- the problem was in the hub's settings.
- If it stays red:
- call BT.
- Evidence to keep:
- Time of the reset and final colour.
Evidence: What do the lights on my BT Hub or Complete Wi-Fi device mean?
Call BT next to the hub
- Who:
- you, on 0800 111 4567.
- How:
- Call while next to the hub with a computer or device at hand. BT says it is usually less busy between 12 and 6.30 pm.
- Result that matters:
- BT running tests with the hub in front of you.
- If they diagnose a hub fault:
- BT handles the replacement.
- If it is a line fault:
- BT or Openreach repair it.
- Evidence to keep:
- Case number and date of the call.
Evidence: What do the lights on my BT Hub or Complete Wi-Fi device mean?
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
- BT
- Product type
- DSL routers
Known code variants
- alexa luz roja fija
- Alexa red ring
- bt hub red light
- bt hub red light meaning
- bt smart hub 2 red light
- bt smart hub red light
- echo luz roja
- Echo red light
- Echo red light microphone off
- eero luz roja
- eero red LED offline
- eero red light
- eero router red light
- eero solid red LED
- Google Wifi luz roja que late
- Google Wifi pulsing red
- luz roja alexa
- luz roja bt hub
- luz roja router o2 fibra
- Nest Wifi luz roja fija
- Nest Wifi point red light
- Nest Wifi Pro fast blinking red
- Nest Wifi Pro rojo parpadea rápido
- Nest Wifi router red critical failure
- Nest Wifi solid red light
- o2 fibra luz roja
- o2 hgu luz roja
- o2 router red light
- punto Nest Wifi luz roja
- router Nest Wifi rojo error crítico
- router o2 luz roja
- router o2 no funciona luz roja
What it means
BT describes the Smart Hub 2 red light as a sign of a problem somewhere, without saying where. Its order of action is to turn the hub off and on, then a factory reset with a paper clip if the light does not turn blue, and finally to call BT. It can come from a hub fault, its settings or the connection, and the light alone does not prove the hub is faulty.
Warnings and stop conditions
- Loweditorial warning
A factory reset returns the hub to its original settings: you lose any changes you made, such as a custom Wi-Fi name or password.
Evidence: What do the lights on my BT Hub or Complete Wi-Fi device mean?
Symptoms and causes
Probable causes · in order
- Temporary hub faultPossible
If the light turns blue after switching off and on, it was a passing fault. It is the first thing BT asks you to rule out.
Evidence: What do the lights on my BT Hub or Complete Wi-Fi device mean?
- Corrupted hub settingsPossible
If a restart is not enough but a factory reset leaves the light blue, the problem was in the stored settings.
Evidence: What do the lights on my BT Hub or Complete Wi-Fi device mean?
- Fault that needs BTPossible
If neither the restart nor the reset brings back blue, BT must check the hub and the line.
Evidence: What do the lights on my BT Hub or Complete Wi-Fi device mean?
Virtual technician
Does LUZ-ROJA 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
What do the lights on my BT Hub or Complete Wi-Fi device mean?
BT · 2026 · official_doc
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