Sure! Based on your prompt — “Ever since I moved into my house a few years ago this thing blinks either red or yellow at night. I can’t tell what it’s for. It’s connected to some wiring in my attic.” — here’s a comprehensive, informative article that investigates the mystery of unexplained blinking lights in homes, particularly in attics. This isn’t a recipe article but rather an investigative home improvement/curiosity piece.

—

# **What Is That Blinking Light in My Attic? Solving the Mystery of Red and Yellow Signals in Your Home**

## Introduction

Moving into a new home is filled with excitement and questions. Over time, some of those questions get answered — like where the draft is coming from or what that old switch in the hallway does. But others persist and grow stranger over time. One such mystery reported by many homeowners is a **blinking red or yellow light**, often located in attics, crawl spaces, or garages, connected to old or unfamiliar wiring.

If you’ve ever looked up into your attic rafters at night and seen a blinking red or yellow light — maybe flashing slowly, maybe intermittently — you’re not alone. In fact, many homeowners have stumbled upon this blinking enigma and asked the same thing:

> *“What is this thing? Why is it blinking? And is it dangerous?”*

This article dives deep into the possibilities — from fire safety devices and HVAC indicators to security systems and even leftover electronics from past owners. Let’s explore what that blinking light might be, how to trace its function, and what steps to take next.

—

## Common Devices with Blinking Lights in Attics

Attics often house several utility and safety devices. If you see a blinking light — especially red or yellow — here are the most common culprits:

### 1. **Smoke or Heat Detectors (Hardwired)**

Many homes, especially newer or renovated ones, have hardwired smoke or heat detectors in attics. These often come with blinking lights to indicate:

* **Red blink**: Power is on and unit is operating.
* **Yellow blink**: Low battery or maintenance required (in combo units).
* **Fast blinking red**: Alarm triggered (or recently triggered).

Even though you might not hear an alarm, these indicators are still active, especially if they’re tied into your home’s main alarm system.

### 2. **Carbon Monoxide Detectors**

In some setups, especially multi-level homes with HVAC systems in the attic, carbon monoxide (CO) detectors are installed up high. They may blink red or yellow to show power, malfunction, or the need for service.

Check for labels or markings on the device. If it’s CO-related, don’t ignore it — carbon monoxide is dangerous and odorless.

—

### 3. **Security System Components**

If your home previously had a security system (or still does), a blinking light in the attic could be:

* A **motion detector repeater**
* A **glass break sensor**
* A **Wi-Fi or radio transmitter**
* A **status LED for the whole system**

These often flash when active, or blink to signal connectivity status. If your home had ADT, Brinks, or another service, you might find remnants still blinking years later.

—

### 4. **Wi-Fi or Smart Home Repeaters**

Smart home tech is increasingly popular, and many systems use **mesh networks**. Devices like:

* Smart thermostats
* Wi-Fi repeaters
* Zigbee/Z-Wave hubs

… may have been installed in the attic for coverage and blink to indicate operation or connectivity status. Yellow typically means setup or caution, red means error or lost connection.

—

### 5. **HVAC System Status Indicators**

Many modern HVAC units have a small LED visible through a viewing window. These:

* Blink in patterns that indicate system status.
* Help technicians diagnose problems using blink codes.
* Are often red or yellow.

If your HVAC is located in the attic, and especially if it’s blinking in a pattern (e.g., 3 short, 1 long), this is probably your answer. Consult the manufacturer manual or call your HVAC company.

—

### 6. **Backup Battery Units or Inverters**

If you have solar panels, a sump pump, or any system that includes battery backups or inverters, they may be installed in the attic and blink to indicate charge or errors.

—

## Could It Be Something Dangerous?

Possibly. Red and yellow often indicate warnings or alerts. Here’s what to watch out for:

* **Consistent rapid blinking**: Could mean system failure or urgent attention needed.
* **Loud chirping + blinking**: Usually means a failing smoke detector.
* **Burning smells or warm surfaces**: Unplug or shut off circuit breakers and call an electrician.

While a blinking light on its own isn’t necessarily a fire hazard, it’s always better to be cautious, especially if it’s paired with strange sounds or smells.

For Complete Cooking STEPS Please Head On Over To Next Page Or Open button (>) and don’t forget to SHARE with your Facebook friends