Sparking usually relates to i) using metal in the cavity or ii) some burnt food on the roof iii) the waveguide cover 'mica' panel is burning iv) door area enamel has been damaged. After 7 years you may want to bin it and get a new one as they are now so cheap, fixing them is usually more expensive.
Answers & Comments
Sparking usually relates to i) using metal in the cavity or ii) some burnt food on the roof iii) the waveguide cover 'mica' panel is burning iv) door area enamel has been damaged. After 7 years you may want to bin it and get a new one as they are now so cheap, fixing them is usually more expensive.