Anonymous

Why Did My Refrigerator Compressor Begin Making A Loud Noise After A Power Outage?

4 Answers

Anonymous Profile
Anonymous answered
When the power goes out while the compressor is running, the high pressure side of the compressor takes a little while (from a few seconds to several minutes) to bleed down to normal pressure.   When the power comes back on fairly quickly, the compressor tries to restart, but the motor makes much less torque at startup and it can't overcome the high pressure still on the output and stalls (can't turn).   A stalled compressor will damage itself fairly quickly.

   Most compressors have a circuit breaker that will shut off power for a minute or two if the compressor is stalled so it doesn't get damaged.   It sounds like your compressor had a circuit breaker that's either faulty or didn't kick in fast enough to avoid damage.

   And, BTW, the US line frequency is 60 Hz.   That frequency is determined by how fast the power plant generators are spinning.   There will be no appreciable differences in the line frequency when power is turned back on (if anything, it'll go down slightly until the generators compensate for the added load).   However, there can be some large voltage spikes that show up as power is restored that might (briefly) look like a higher frequency signal.
Anonymous Profile
Anonymous answered

Self-defrosting refrigerators use a circulating fan to move the air through the freezer and refrigerator compartments. This fan runs whenever the unit is cooling. The fan is located in the freezer, as follows:

If the freezer is on top, the fan is on the back wall, near the top or bottom, in the center of the freezer.

If the freezer is on the bottom, the fan is on the back wall, near the top of the freezer.

If the freezer is on the left, the fan is on the back wall, halfway up or near the top.

Over time, the fan may become noisy--usually making a chirping or squealing sound, though it may make a loud groaning noise instead.

To find out if the fan is causing the noise, just open the freezer door and push in any fan/light switches. If the noise is louder when the door is open, the evaporator fan motor is the cause. You can't lubricate or repair this motor. You must replace it. 
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Arsalan Maqbool Profile
Arsalan Maqbool answered
This must be due to the fact that your refrigerator compressor has malfunctioned.This happens when a power failure occurs and then returns with more than necessary voltage.
George Bartlett Profile
George Bartlett answered
Here in the US we have 80 Hertz. If you can picture a very long eight (8). When the power is off because of a power outage and starts back up from the transformer located on the power pole out back they start up around 110 Hertz. It expands the eight to a very thin zero if you look at a ocolator. It will burn up motor windings on motors and compressors in A/C. Next time turn off A/C, heat, dryer off at the panel box. Then wait a couple of minutes after the power returns then turn on at the panel box. Sorry I feel your compressor is damaged. Get a HVAC tech. To check it out. Good luck.

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