Yes Raden (see my post above). Geoff sent me a new one. In fact, he sent me a whole new board which I took the fuse from and returned the board.
All is now working fine.
Martyn
Thanx soggy for your quick response. However, spending a whole bunch of time checking through other threads, I was made aware of and headed towards the fuse on the PCB.
On checking, the fuse was smashed, with only one cap inside. tried the trusty old 'screwdriver-bridge' and she fired up...
Okay, here goes.
Boiler is Suprima 60 with balanced flue. System is non pressurised, running 10 rads on CH and 1 towel rad & cistern on HW. Boiler is 8 years old and has previously operated without fault.
System was shut down & drained to move radiator in one of the bedrooms. system was idle...