How to Fix an Extractor Fan Not Working

Overview

An extractor fan that does not work can cause condensation problems. This guide covers diagnosing and fixing the issue.

Step-by-Step Fix

1. Firstly, before attempting any repairs, always switch off the electricity supply to the fan circuit at your consumer unit (fuse box). Confirm the power is off by trying to switch on the fan and listening for any operation, or by using a voltage tester pen on the light switch or fan unit itself.
2. With the power safely isolated, carefully remove the faceplate of the fan's wall switch and use a multimeter set to continuity mode to test the switch terminals. If the switch shows no continuity when pressed, it is likely faulty and will need replacing before proceeding.
3. Next, remove the cover from the extractor fan unit and carefully inspect all the wiring connections inside, ensuring none are loose, corroded, or disconnected. Tighten any loose screw terminals and check for signs of heat damage or burnt insulation, which could indicate a short circuit.
4. To test the fan motor, disconnect its power wires and use a multimeter set to resistance (ohms) to check for continuity across the motor's terminals. A reading of infinity (open circuit) or very high resistance suggests the motor windings are burnt out or broken, indicating a faulty motor.
5. If your multimeter test confirms the motor is faulty, it is generally more economical and safer to replace the entire extractor fan unit rather than attempting to replace the motor alone. Ensure the new fan is of a similar size and specification, and carefully follow the manufacturer's installation instructions for wiring and mounting.

Common Symptoms & Diagnostic Resolutions

Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.

Frequently Asked Questions