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Re: Refrig compressor "knocks" when cycling off
Could be a broken spring inside the compressor and would only make a noise as the compressor stops. nothing you can do about it. you would need to break open the compressor, replace the spring, weld it back, then charge it up again with refrigerant.
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Richard, It is important to know if the compressor itself is running. If there is a loose connection to the compressor via the start/over load relay (normally attaches directly onto the compressor), or if the start/over load otself is bad the compressor will not run. Best way to tell is via gauges but I doubt your frig has ports. Check to see if your compressor is really hot. Could be bad start/over load relay or bad compressor. Try unplugging your frig for say 30 min then, with your hand on top of a cool compressor, plug the frig back in and see if compressor smoothly vibrates for at least 5 min without becoming very hot or shutting off even though fan continues to run. The fact your fan is running TYPICALLY means the thermostat is calling for lower temps and the fan/compressor kick in together.
It could be a defective defrost timer if you have lights and NO fans running nor compressor starting you maybe able to tell if it shut off about every 5-8 hrs. Now if it shut off after every cool cycle then I would tap the refrig temp control with a firm tap if the frig starts then it is a defective operating thermostat.
The timer will advance whenever the cold control is on. (when the compressor is running, or the timer has advanced into a defrost cycle) When the refrig is cold enough (and the timer has not advanced into defrost) the timer will not be advancing. A typical defrost timer will count up 8 hours of compressor run time before going into a 30 minute defrost cycle. (the run time and defrost time can vary greatly from model to model)
It is probably caused from one or more of the four rubber bushings that mount your compressor to the refrigerator frame. The bushings wear over time and causing the compressor bracket to have a little play. Then when the compressor stops it moves the frame slightly bumping against the mounting bolt causing a slight to moderate sounding clunk when stopping, Also check a lines and cords as a cord refrigeration line near the compressor or fram can also cause the problem.
Is your compressor running? Remove the back lowr panel and see if it is running. Put your hand on it and see if it is vibrating. If not then either you have a bad compressor, or the compressor start relay is bad. It also could have leaked the refrigerant if the compressor is running.