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We have a sub-zero 561 side-by-side. The freezer has not been staying cold (around 45F). We keep the condenser cleaned, and it's fan is running properly. We found that the freezer compressor keeps thermally cutting out. The surface temp of the compressor is about 140F when the thermal limit switch cuts it out. When it re-starts, it's drawing 4.6 amps and after it runs for a bit it levels out at about 2.6 amps. The refrigerant low side pressure holds steady at 20 pounds as far as we know the system still has R-12 in it. When the compressor is off the static pressure is about 60 pounds. Couldn't find any information on what the running or static pressures should be... so we recovered what refrigerant was in it and evacuated it and recharged it with 8 oz. of R-12 as per label on door jamb. No change in anything, the compressor keeps cutting out. Are we looking at a bad compressor or do you know of any other problem that would cause this? Frig side will maintain 40F, but the thermostat has to be set at 10. The compressor runs much cooler (100F) and draws 2 amps at start-up and runs or settles in at 1.5 amps. The low pressure is at about 28 psi and the static pressure is around 65. Our unit is completely built in with custom wood panels that match the cabnitery so we'd like to fix it if economically practical. The serial # is: P733870 installed February 1989. Thank you! Mar Gee Farr

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Usually there are a couple of issues which can cause this. The first thing you should check is the current which supplies the refridgerator if this is stable. If not then all you need is a stabilizer or an automatic voltage regulator.
If this is not the problem then the compressor is bad and should be replaced. With the age of the refridgerator this should be expected the thermostat should also be checked and replaced if the problem persists.
But on the whole if the system will be fixed by a proffessional it will be more economical if fixed as compared to buying a new set which will need new space and might now be as nice looking as the present state.
Hope this was very helpful.

Posted on Jul 12, 2010

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