Rads keep heating

[StoneFish]

Hi there,
I have a problem with my Alpha CB24X. I got up on saturday morning 16/12 to find my house was like a sauna. The selector control is on hot water only,but my rads are continually heating to max heat(the temp dial on the boiler for the rads is set to zero). I've tried resetting the system but this has no effect.
One of my rads has no independent temp control, so when we need hot water this rad is like a hot plate.
Any help would be much appreciated.

 

[ChrisR]

FLow switch on Diverter valve stuck on. Manual is on their site. Unclip and wiggle it, you might get lucky, until you get a replacement.

 

[StoneFish]

Thanks ChrisR.
Everything seems to be running as it should at the moment. The clip push pin had a slight build up around it.
Is it normal for some leakage to be present around the clip?