I have a Boilermate 2000 which keeps blowing a fuse on the Appliance Control Board. The board has been "buzzing" lately and has got progressively worse over a number of weeks then the fuse blew. 2 guys came to fix it, charged me over £100 to replace a 2A fuse. It has been ok for about 3 weeks but has now gone again. I replaced the fuse and it blew immediately. Can anyone please help me?