WiFi Troubleshooting

Updated02/06/2026

BySimon | Ciz ICT

Table of Contents

This guide will take you through some steps/checks to perform if you are having problems connecting to the internet.

1. Broadband & WiFi Troubleshooting Guide

Before reaching out for support, please work through this 5-minute checklist. This helps us determine if the issue is with your internal WiFi hardware or a wider service outage from your provider (ISP).

2. Is it just one device?

First, check if other devices (phones, laptops, smart TVs) are working.

One device down: The issue is likely with that specific gadget. Try toggling WiFi off and on, or restarting the device.
Everything down: This indicates a broader issue with the incoming broadband line or the core networking hardware.

3. Checking the ONT Box

If you have fibre, you should check your ONT box. This is usually a small white box where the fibre connection comes into your property.

Power: Should be solid Green.
PON (Passive Optical Network): It should be Solid Green. This means your house is successfully “talking” to the exchange.
LOS (Loss of Signal): This light should be OFF. If you see a Flashing Red LOS light, the fiber cable is physically broken or disconnected outside.
LAN: This should be flashing. It shows that the box is successfully sending data to your router.

⚠️ Note: If the LOS light is Red, we cannot fix this remotely. You must contact your ISP (Ivertec, Eir, Sky, etc.)

Check if there is a known service outage in your area. You will often need your Account Number (found on your bill) to run a live line test.

4. Check your ISP's router

Broadband routers will usually have the same or similar light indicators. Here’s what to check:

Power:

Solid Green: Connection is healthy and synced.
Flashing Green: Searching for a signal. Check that the cable is firmly plugged into the wall.

Internet

Solid Green: Online and authenticated.
Off or Red: The line is connected, but your ISP account details (username/password) are missing or incorrect.

WLAN (WiFi)