Hi, anything made by man can be fixed within reason. A far as I know these days Belling exists a name only. the most likely fault is going to be a failure of the safety interlock switches and the associated monitor fuse. Probably around £35 in a decent reapir shop. A more serious failure would be on the high voltage side, say the high voltage capacitor or the magnetron. "Ish" pricing, capacitor and labour £45 magnetron diode and labour £65. try to find a repairer who offers a low cost estimate price. We charge £10 which is low but fair
kindest regards
B.E.S. Microwaves
01424 447799
patrick, March 2009