Simplisafe Motion Sensor Not Working? Here's How to Fix It.
Your Simplisafe motion sensor is a vital part of your home's defence, designed to detect an intruder's movement and trigger an alarm. If you suspect your sensor isn't working, it's a security risk that needs to be addressed immediately. A sensor that fails to detect movement is a silent vulnerability.
This guide provides a clear, step-by-step process to help you diagnose and fix a non-responsive motion sensor. We will cover the most common reasons for failure, from simple placement errors to connectivity problems.
## Signs Your Motion Sensor Isn't Working
How can you be sure the sensor is the problem? Look for these specific signs:
- Fails the Walk Test: You can walk directly in front of the sensor, but it doesn't trigger an alert or a chime (in the correct mode).
- No Events in Timeline: When you check your Simplisafe app's timeline, there are no "motion detected" events logged for that sensor, even when you know there has been activity.
- No Blue Light: The small blue LED light on the sensor does not flash when you move in its field of view (note: this light only flashes during tests or for a short period after setup).
- System Ignores the Sensor: The sensor seems to be completely ignored by the Base Station, with no error messages or notifications.
- Fails in Test Mode: When you put the system in Test Mode, the Base Station does not acknowledge the sensor when you press its test button.
## Step-by-Step Troubleshooting Guide
Follow these steps in order. Most issues can be resolved without needing to contact support.
### 1. Put Your System into Test Mode
Before you do anything else, you need to test the sensor properly without triggering a false alarm.
- Go to your Simplisafe Keypad.
- Press Menu, enter your Master PIN.
- Select Test Mode from the menu.
- The Base Station will announce, "System in Test Mode".
- Now, press the small test button located on the top edge of the motion sensor.
- The Base Station should immediately say, "Motion Sensor". If it does, you know the sensor is connected. If it doesn't, there is a connection or power issue.
- Walk in front of the sensor. The Base Station should chime or announce the sensor again.
### 2. Check the Sensor's Battery
A dead or dying battery is the most common cause of a non-responsive sensor.
- Slide the motion sensor up and off its mounting bracket.
- The battery compartment is on the back. The sensor uses one CR123A Lithium 3V battery.
- Remove the battery and wait for 30-60 seconds before inserting a brand new one. This also serves to reset the sensor.
- Important: Use a new, high-quality battery. Do not use an old battery from another device.
- Once the new battery is in, put the system back into Test Mode and test it again.
### 3. Review Sensor Placement and Obstructions
The sensor needs a clear view to detect motion. It uses passive infrared (PIR) technology, which detects body heat.
- Height: Is the sensor mounted between 1.5 and 2 metres off the floor? This is the optimal height.
- Obstructions: Look for anything that could be blocking its view. Large furniture, plants, curtains, or even a stack of boxes can create significant blind spots.
- Angle: Ensure it's positioned in the corner of a room, looking down across the main traffic area. It should not be placed flat against a wall looking straight out, as this is less effective.
- Avoid Heat Sources: Do not place the sensor facing a radiator, a sunny window, or a heating vent. While this usually causes false alarms, in some cases, it can interfere with its ability to detect a person.
### 4. Check for Signal Interference or Range Issues
The sensor must be able to communicate with the Base Station.
- Range: The sensor should be within approximately 30 metres of the Base Station.
- Interference: Dense building materials like brick, concrete, or metal can block the signal. Other wireless devices can also cause interference.
- Test the Range: If you suspect a range issue, temporarily move the sensor into the same room as the Base Station. If it starts working reliably, you have identified a signal problem.
By systematically checking the test mode, battery, placement, and signal range, you can effectively diagnose and fix your Simplisafe motion sensor and ensure your home is properly protected.