hello, thanks for using JA
No worries enough info?
What you are hearing is perfectly normal. In the bottom of the freezer is a heater coil that is controlled by the defrost control. Every 8-12 hours the unit turns off the compressor and turns on that heater to melt the frost that accumulates in the 8-12 hour period. There is nothing to worry about, it will normally stops within 30 mins.Without that it will stop working.
Great was just late at night and heard the noise. Hoped it was just that but didnt want the house to burn down
dont worry about it it will be fine