A few weeks ago, my fridge (MZD2665HEB) stopped working. I noticed the dreaded buzz/click coming from the compressor area about every minute or so, but the compressor would not start. I installed a new PTC and the fridge started working again. However, I noticed that the defrost cycle occurs almost ever hour or two. This seems way too often to me.
To make matters worse, yesterday I again noticed the buzz/click sound and the compressor was once again not working and felt too hot. I unplugged the fridge to let it cool and checked the PTC that I installed a few weeks ago for continuity and the ohms on the compressor terminals. The common to start was 4.8, the common to run was 3.9, and the start to run was 8.5. After a couple of hours, I plugged the fridge back in and it started working again with no problems. However, the defrost cycle still starts about every hour or two.
I know that his unit has a adaptive defrost control board and that the defrost cycle will depend of several factors, but I can't believe that this is normal. Could the board be bad? Can a defective board cause the compressor to overheat and stop, or is my compressor about to fail? Can low refrigerant be the problem? The buzz/click still occurs at least once, sometimes twice, after the defrost cycle but the compressor does turn over.
My wife says that the refrigerator always made a buzz/click sound, but I'm not so sure. Funny how you never think about these things until there are problems. Now I'm acutely aware of the noise (or lack of noise) the fridge makes when I'm in the next room. Although the fridge is still working and hasn't failed since, I'm afraid it's just a matter of time before it fails again. Any thoughts? Thanks in advance!