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Thanks Matthew, Since my last post the programmer has gone again and despite opening it up, there doesn't seem to be an obvious problem with the programmer. Is it likley that the problem is with the programmer or with the wiring from the boiler to the programmer (probably an impossible...

Hopefully someone can help me. This is my first post so sorry if I don't include all the information. Yesterday my Sunvic XL C/H programmer made a loud buzzing noise and gave off an electrical burning smell before the digital screen went blank. I took the programmer off the wall...