Light pattern
What Does a Solid Light Mean?
A solid light usually means the device is in a steady state, such as powered on, connected, charged, ready, or locked into an error condition.
Guides with solid lights
Router Solid Red Light
A solid red light on a router usually means the router has no internet connection, failed to connect to the modem, detected a service issue, or is showing a device-specific fault.
Router & Modem Lights · General
Netgear Orbi Purple Light
A purple or magenta light on a NETGEAR Orbi system commonly points to an internet connection issue, failed sync, or the router being unable to reach the internet.
Router & Modem Lights · NETGEAR Orbi
Carbon Monoxide Detector Red Light
A red light on a carbon monoxide detector can indicate alarm, fault, memory, low battery, or end-of-life depending on the model. Treat any CO alarm as serious.
Carbon Monoxide Detector Lights · General
Charger Solid Green Light
A solid green light on a charger usually means the battery is fully charged, the charger is powered and ready, or the device is in a normal charged state.
Battery Charger Lights · General
Ring Doorbell Blue Light
A blue light on a Ring doorbell can indicate charging, setup, two-way talk, recording, startup, or connection activity depending on the pattern.
Smart Home Lights · Ring
Eero Red Light
A red light on an eero usually means the device is not connected to the internet or cannot reach the network correctly.
Router & Modem Lights · eero
TP-Link Router Orange Light
An orange light on a TP-Link router usually points to internet, WAN, setup, or connection status depending on the model and which LED is orange.
Router & Modem Lights · TP-Link
Google Nest Wifi Orange Light
An orange light on Google Nest Wifi usually means the device is starting, has a connection issue, or needs attention in the Google Home app.
Router & Modem Lights · Google Nest Wifi
Brother Printer Toner Light
A Brother printer toner light usually means the toner cartridge is low, empty, not seated correctly, or not being detected by the printer.
Printer Lights · Brother
Brother Printer Drum Light
A Brother printer drum light usually means the drum unit is near end of life, needs cleaning, needs reseating, or must be replaced depending on the model.
Printer Lights · Brother
First Alert Green Light
A green light on a First Alert alarm often indicates power or normal operation, but the exact meaning depends on the model and whether the light is steady or blinking.
Smoke Alarm Lights · First Alert
Kidde Smoke Alarm Red Light
A red light on a Kidde smoke alarm can indicate normal status, alarm memory, active alarm, low battery, hush mode, or a model-specific warning.
Smoke Alarm Lights · Kidde
Blink Camera Red Light
A red light on a Blink camera usually points to setup, connection, low battery, recording, or camera status depending on the model and pattern.
Security Camera Lights · Blink
Blink Sync Module Red Light
A red light on a Blink Sync Module usually means it is not connected correctly, has a Wi-Fi problem, or is in a setup or error state.
Smart Home Lights · Blink Sync Module
Arlo Camera Orange Light
An orange or amber light on an Arlo camera usually points to battery, sync, connection, charging, or setup status depending on the camera model.
Security Camera Lights · Arlo
Wyze Camera Yellow Light
A yellow light on a Wyze camera usually means the camera is starting, connecting, ready for setup, or having trouble connecting depending on the pattern.
Security Camera Lights · Wyze
Battery Light on Dashboard
A battery light on the dashboard usually means the vehicle charging system is not working correctly, not simply that the battery is old.
Car Dashboard Lights · General
Oil Pressure Light
An oil pressure light can mean the engine does not have enough oil pressure. It should be treated as serious because continuing to drive can destroy the engine.
Car Dashboard Lights · General
Tire Pressure Light
A tire pressure light usually means one or more tires are underinflated, but a blinking TPMS light can indicate a sensor or system problem.
Car Dashboard Lights · General
NETGEAR Orbi Solid White Light
A solid white light on a NETGEAR Orbi usually means the router or satellite is starting up, syncing, or in a normal setup/status state depending on the model and timing.
Router & Modem Lights · NETGEAR Orbi
NETGEAR Orbi Blue Light
A blue light on a NETGEAR Orbi satellite usually means the satellite has a good connection to the router after syncing.
Router & Modem Lights · NETGEAR Orbi
Router Internet Light Red
A red internet light on a router usually means the router cannot reach the internet through the modem, gateway, ONT, or ISP connection.
Router & Modem Lights · General
Ring Camera Blue Light
A blue light on a Ring camera can indicate setup, live view, two-way talk, recording, charging, or connection activity depending on the model and pattern.
Security Camera Lights · Ring
Security Camera Green Light
A green light on a security camera usually means power, network connection, ready status, or setup progress depending on the brand and model.
Security Camera Lights · General
Airbag Light on Dashboard
An airbag light usually means the supplemental restraint system detected a fault and the airbags or seatbelt pretensioners may not work correctly in a crash.
Car Dashboard Lights · General
ABS Light on Dashboard
An ABS light usually means the anti-lock braking system has detected a fault. Normal braking may still work, but anti-lock braking may be disabled.
Car Dashboard Lights · General
Temperature Warning Light
A red temperature warning light usually means the engine is overheating or coolant temperature is too high. Continuing to drive can cause severe engine damage.
Car Dashboard Lights · General
Verizon Router Red Light
A red light on a Verizon router usually means the router has a connection problem, internet service issue, or router status warning depending on the model.
Router & Modem Lights · Verizon
AT&T Gateway Red Broadband Light
A red broadband light on an AT&T gateway usually means the gateway cannot establish or maintain its broadband connection.
Router & Modem Lights · AT&T
Smoke Alarm Yellow Light
A yellow light on a smoke alarm usually means attention is needed, such as low battery, fault, hush mode, end-of-life, or a model-specific maintenance condition.
Smoke Alarm Lights · General
Smoke Alarm Solid Green Light
A solid green light on a smoke alarm usually means the alarm has power or is operating normally, but the exact meaning depends on the model.
Smoke Alarm Lights · General
CO Detector Green Light
A green light on a carbon monoxide detector usually means the alarm has power or is operating normally, depending on the model.
Carbon Monoxide Detector Lights · General
Dryer Check Filter Light
A dryer check filter light usually means the lint filter, vent path, or airflow system needs attention before or during a drying cycle.
Appliance Lights · General
Fridge Filter Light
A fridge filter light usually means the water filter is due for replacement or the filter reminder needs to be reset after replacing the filter.
Appliance Lights · General
Thermostat Red Light
A red light on a thermostat can mean heating is active, emergency heat is on, battery is low, power is missing, or a model-specific fault is present.
Smart Home Lights · General
Ring Doorbell Red Light
A red light on a Ring doorbell may be related to infrared night vision, power, setup, or model-specific camera behavior depending on when it appears.
Security Camera Lights · Ring
Arlo Camera Blue Light
A blue light on an Arlo camera usually means syncing, charging, connection, or camera status depending on the model and blink pattern.
Security Camera Lights · Arlo
PlayStation White Light
A solid white light on a PlayStation console usually means the console is powered on and working normally.
Game Console Lights · PlayStation
Blue Light on Power Strip
A blue light on a power strip usually means power, surge protection, USB charging, grounding status, or a switched outlet state depending on the model.
Battery Charger Lights · General
Surge Protector Red Light
A red light on a surge protector can mean protected, grounded, fault, or warning depending on the label next to the light and the model.
Battery Charger Lights · General
Brake Warning Light
A red brake warning light can mean the parking brake is on, brake fluid is low, or the brake system has a fault that needs immediate attention.
Car Dashboard Lights · General
Traction Control Light
A traction control light can mean the system is actively helping during slippery conditions, turned off, or reporting a fault depending on whether it flashes or stays on.
Car Dashboard Lights · General
Medical Device Battery Light
A battery light on a home medical device usually means the device battery is low, charging, missing, not detected, or needs replacement depending on the device.
Medical Device Lights · General
CPAP Red Light
A red light on a CPAP machine usually means the device needs attention, such as power, humidifier, filter, mask leak, service, or a model-specific fault.
Medical Device Lights · General
Pattern matters
A solid light, slow blink, fast blink, and alternating pattern can all mean different things. Check the exact pattern before resetting or replacing anything.
How to understand a solid light
A solid light often means the device is actively trying to tell you something. It may be connecting, charging, pairing, updating, reporting a fault, or repeating a reminder. The meaning changes depending on color and device type.
Do not judge the pattern alone. A slow blink may be normal on one product and a low-battery reminder on another. A fast blink may mean pairing mode, but it can also mean an urgent fault. Alternating lights are especially model-specific because many devices use them as diagnostic codes.
Useful details to note
- The color of the light.
- Whether the pattern is slow, fast, pulsing, or alternating.
- How long the light has been doing it.
- Whether the device recently lost power, Wi-Fi, signal, paper, ink, battery, or connection.
- Whether the device is also beeping, chirping, clicking, overheating, or showing an error message.