gingerbreadgirl

I never use extractor fans they always just seem like they make noise and that's it! 

Never had a router so can't help you at all there! Hopefully you get it sorted

Extractor fans have an on off override usually above the bathroom light switch. 

And they only work when the light is on. 

I would say there was some water ingress from outside trapped in the hole. There is supposed to be a 2-way flap on the outside which only opens when the fan is running, to let the air out. 

Sounds like that flap is stuck open. 

Thanks Roy. Yes I can turn it on it just doesn't clear the steam very well which is why I hoovered it. I don't think it's to do with the flap as it only happened after hoovering it however it seems to be stopping now which is good.