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DO NOT TRY TO MODIFY TIMING CYCLE.you would need to completely modify printed circuit board and inbuilt computer......some freezers cycle around 6 to 8 hours.the temperature can only be checked say every 12 hours to get an average reading
John, What you are hearing is popping caused by thermal expansion inside the evaporator enclosure during its' defrost cycle. Depending on your make and model, it'll go into defrost every 8 to 12 hours of compressor "run time". That is, the defrost timer "monitors" how long the compressor runs and after it accumulates the pre-set "run time", the timer then shuts the compressor off and initiates its' programmed defrost routine. This routine lasts for 20-30 minutes, or until the defrost thermostat opens. The defrost routine sends 120 volts to a heating element in the evaporator compartment which gets red hot. This sudden temperature change (from below freezing to warm) causes the cabinet to expand slightly. That's when you hear the "Pop".
I hope this helps, John. Thanks for using FixYa, and don't forget to rate my answer.
WALK INS HAVE TWO THINGS THAT SHORTEN DEFROST OR MAKE THEM LONGER. IF ALL THE ICE IS BEING CLEARED BY THE HEATERS IN THE COIL THEN IT WILL KICK OUT AUTOMATICALLY IF DEFROST CONTINUES AND THE COIL GETS TO HOT DUE TO AN OVERTEMP SENSOR ON THE COIL. HOWEVER IT WILL STAY IN A DFROST AS LONG AS IT IS PROGRAMMED TO UNLESS THAT SENSOR TRIPS. SO...... LOOK AT THE TIME CLOCK AND SEE WHAT LENGTH OF TIME ITS IS SET FOR. USUALLY A DEFROST CYCLE WILL BE SET FOR 30 TO 40 MINUTES. IF SET TO LONG THEN DEFROST GOES TO LONG AND ONLY COMES BACK ON WHEN SENSOR TRIPS. ADJUST CLOCK TIME TO 30 MINUTES OR 5 MINUTES LESSS THAN ITS SET AT RUN A FEW DAYS AND OBSERVE ICE FORMATION ETC. CLOCK MAY BE STICKING AND MAY NEED A LIGHT DRENCHING OF THE GEARS WITH A LIGHT OIL. TURN IT AROUND A FEW TIMES TO SPREAD OIL AROUND. YOU COULD RUN A CHECK ON THE CLOCK BY SETTING THE TIME TO TWO MINUTES AND GENTLY TURN IT TILL ITS CLICKS INTO A DEFROST AND WAIT . IT SHOULD COME OUT OF DEFROST AND BACK INTO REFRIGERATION IN 5 MINUTES. IF DEFROST IS SET WAY TO LONG THEN IT HAS BEEN RELYING ONLY ON THE TEMP OVERTEMP SENSOR TO TERMINATE DEFROST. IF IT FAILS THEN THE EXCESSSIVE DEFROST WILL CONTINUE TILL PRODUCT MELTS. SETTING THE CLOCK TO A SHORTER TIME SHOULD CORRECT BUT THE OVERTEMP SENSOR IS PROBABLY BAD . AVAILABLE FROM MOST COMMERCIAL REF REPAIR COMPANIES. OR YOU MAYBE CAN ORDER FROM MANUFACTURER AND CHACK EXACT OEM PART WIRE FOR WIRE ETC. LABEL ALL WIRES . TURN OFF POWER, TEST IT. MAKE NOTES.