If the refrigerator door is accidentally left open will it burn out the compressor pump's motor?

If you leave your refrigerator's door open whilst it is switched off, no harm will be done - in fact it is a very good idea to do this as it will help to prevent the mold build-up which can easily happen if it is left closed at normal room temperature with no fresh air circulation.

If you leave your refrigerator's door open whilst it is switched on, the compressor pump will run continuously trying to cool the air in the room whilst at the same time pumping heat out into the same room!

That is not a good idea for at least 3 reasons:

* you will waste electricity 24/7

* the fridge will not cool down enough to protect any food * the compressor and its electric motor will both overheat, which will usually reduce their normal working life from 8 to 10 years to only maybe 1 year or less.