Helpful and quick
Anonymous posted an answer for this Miele S548 Bagged Canister Vacuum:
"The burning smell may be the motor that's on its way out. Vacuuming with a blocked pipe or..."
Anonymous posted an answer for this Sub-Zero 611 / O Bottom Freezer Refrigerator:
"if the compressor keeps switching on and off in short bursts, its your gas thats finished...."