i have this biasi 24s 1999 model combi keep blow blowing the 1.6amp fuse on pcb when replaced it will fire up for about 5 mins then blows again of late has been switching off occaisonaly having to press the read light trip button to get it back on im thinking may be pump problem and if any knows what type resistance should i get if checked with multimeter i would be very great full if any one could help