Every now and again my central will decide its had enough, give it a couple of days and its changed its mind and is working again. I have no idea what's causing this?

Any info would be most appreciated.

Cheers

A Very Proud Polo Owner

Mine does the same when the keys are out of ignition, don't know if its a safety protective measure

I've been trying to figure this one out for ages and I think I've cracked it!

Inside the pump there is a circuit that connects when the air presure builds up enough to lock the doors and descreases to unlock them, this tells the pump when to stop.

If for some reason the presure doesn't build up enough to connect the circuit the pump will carry on working to try and do so, after 20 seconds or so an overide function kicks in which tells the pump to stop working. It will then decide to start working again the next day after it's reset itself.

Now this can be caused by a few things 1- A leak in the system (I checked this and found no leaks) 2-Your pump is on it's way out either from wear and tear or water can sometimes leak in through the rear light cluster although I think this was sorted out on the MK5's (I took my pump apart and could find nothink wrong with it) or 3-And this is the one that cured mine, I think the pump that VW uses, unless brand new, ain't up to the job of moving all the locks, I noticed that when I moved the pump around whilst it had stopped it started to work again so all I did was turn it upside down put it back and it's been fine ever since, I think it's able to get the presure through the pipes easier this way!

Hope this helps, let me know if you have any joy!