Extractor fan not turning on — diagnose the cause before you replace anything
DIYmaity identifies the most likely fault path from your exact fan type, wiring context, and symptom pattern — then tells you what’s safe to do next.
High RiskAround 1 in 3 bathroom fan callouts trace back to the wrong assumption (timer vs isolator vs supply). Replacement-first fixes often fail because the issue is upstream: switch, timer module, or supply feed.
An extractor fan that won’t turn on isn’t one fault — it’s a decision tree. Same symptom can mean: no power, wrong trigger, failed timer, seized motor, or a safety cut-out. Your fan type and how it’s supposed to start changes everything.
Get personalised DIY guidance for your situation
Our AI analyses your specific context and provides tailored recommendations.
Get personalised helpHow Our AI Thinks About This
- Start-condition match: light-linked, pull-cord, humidistat, PIR, always-on
- Power-path check: isolator position, fused spur rating, circuit availability signals
- Behavioural signature: silent dead, brief start then stop, intermittent start, humming
- Environmental weighting: condensation exposure, loft temperature swings, ingress marks
- Age-and-brand likelihood: timer module failure vs motor seizure patterns
Risk Assessment
- Electric shock exposure at switches, isolators, and ceiling terminations
- Hidden shared circuits (lighting feed vs fan spur) and mis-isolation risk
- Fire risk signals: overheating motor, damaged insulation, loose terminations
- Moisture-related faults in bathrooms and external wall penetrations
What Changes the Outcome
- Fan trigger type (light-linked, pull-cord, humidistat, PIR, continuous)
- Any indicator signs (isolator neon, fused spur status, other lights working)
- Sound/behaviour (completely dead, hums, starts then stops, runs only sometimes)
- Location and environment (bathroom zone, loft-mounted, external wall, duct length)
- Recent changes (new light fitting, redecoration, trip/reset events, tenant DIY)
- Fan age and history (noisy for weeks, slowing down, condensation staining)
Why Generic Advice Falls Short
Generic advice assumes the wrong fan type and the wrong trigger. DIYmaity routes by your wiring context and symptom signature so you don’t replace the fan when the fault is the supply or control.
What We'd Ask You
- Does it ever run (even briefly) or is it completely dead?
- Is it linked to the light switch, a pull-cord, or a sensor (humidity/PIR)?
- Is there a 3-pole isolator and is anything else on that circuit working?
- Any humming, burning smell, or recent tripping?
Get a fault-path decision in 2 minutes
Tell DIYmaity what you’re seeing — we’ll classify the likely cause, risk level, and next-best action for your setup.
Diagnose my extractor fanFrequently Asked Questions
Often it’s upstream (isolator, fused spur, timer/humidistat trigger) rather than the motor. DIYmaity separates “no supply” vs “no trigger” vs “fan fault” from your symptoms so you don’t buy the wrong part.
If there are overheating signs, burning smells, repeated trips, moisture ingress near electrics, or uncertainty about isolation/circuit routing. DIYmaity flags these patterns early and routes you to the safest next step.
Yes — many fans won’t start unless the correct trigger is present, and some have overrun/timer logic that changes behaviour. DIYmaity identifies the trigger type from your switch layout and fan model cues.
Fan type, how it’s meant to activate, what else on the circuit works, and the exact behaviour (silent/hum/intermittent). A photo of the isolator/fused spur and the fan label increases confidence and reduces guesswork.