I strongly suggest moving this collection of information to a new forum with a search function that works.
^my explanation for probably posting on a topic that has been covered, I can hardly ever find things from searching here

Anyways,
My heater recently start to act weird, it will go then there's a click and it will fluctuate fan speed and eventually stop.
Hot / Cold works fine, just it will cut out nearly all the time.
You can switch it on full tit and it will run nearly 85% of the time but you can still hear the fanfluctuating a bit.
As it's winter this effect's my foggy windows

Can anyone advise, I'm wondering if this is a common fault, like a voltage regulator has failed or something and needs to be replaced?
Hmm....