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Boilers been running now for a week, all looks OK. Replaced PCB, replaced wiring loom and differnial valve. Couldn't find any obvious faults, apart from the leak from the differential valve had been dripping on to one of the spade connectors on the solenoid, also one of my room thermostates...

Hi Raden, It's the switch PCB. Ken

Thanks Andy, I'll give Valiant a call tommorrow and see what hey have to say. Ken

Hi Andy, It's a shame you can't see the pictures I've taken, you will see that it has well and truly blown at the back of the left hand switch ( the one with the rad on it), as well as the lower track at the back of the board. The 'A' connector has also been badly damaged third wire up from...

Valiant Sine 18 T3WF H Serial No. 18921586 Could anybody please tell me what might have caused the PCB to blow on the above boiler. Hopefully picture will be attached by admin.

Thanks for your quick response ChrisR. I would be grateful if you could email me the PDF. Many thanks again.

Many thanks for your help, ChrisR & bengasman. One last question before I set to work on it. Where is the diaphriam situated in the boiler, is it part of the Diverter Valve? By the way the Model is a VCW-sine18 T3W - GC No. 47 04401

I have a Valiant Sine 18 Combi Boiler which has served me well for many years. I now have a problem. I can only get hot water to the taps when the heating side is on. If the heating side is off, I only get cold water from the taps. Can anybody help.