Hi Chaps, We've just had a new boiler/system installed by a plumber and it was wired separately by a qualified electrician, the electrician wired this as per the Vaillant manual. The system is fully filled and vented but when trying to call for heat or water via the stats nothing seems to happen. Live monitor shows S30 but not faults. Any ideas what could be the issue? the plumber has been called to came and check it out again but he is currently on holiday and wont be back until next weekend, the customer needs the system working soon as. Any ideas what could be the issue?