I have a f20 error on fridge will my food stay cold until Monday when a technician can come could you please answer me/.

SOURCE: Black Maytag Side by Side MSD2756AEB 7+ yrs old? Won't stay cold...

Your condenser where the heat is removed from the refrigeration system may be plugged with dust. The condenser is more than likely located in back of the refrigerator behind a removable panel. Remove the panel and clean it out. Reinstall the panel after you have cleaned the condenser.

Check the back wall of the freezer for frost buildup. If there is frost buildup on the back wall it indicates that there is a problem in the defrost circuit.

Note: The proper term is "More mature individual" , not old.

SOURCE: SAMSUNG RS20CCMS AMERICAN STYLE FRIDGE FREEZER

in the freezer section there is a 6 screws. unscrew them and remove the back panel. there will be 2 wires attached to the panels, remember where they go. you will see a metal evaporator which will be filled with ice. this is the problem. use a hairdryer to melt the ice. this is essential as you mustn't puncture the wall of the fridge with any sharp item. before replacing the panel ensure that everything is dry or ice will reform, and also ensure that the fan blades are turning properly or cold air will not be blown into the fridge.

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Check the condenser fan, listen and see if it kicks on, if it doesn't then find someone that know how to take it apart and change them.

SOURCE: freezer not freezing food and fridge not staying cold enough

Check the compressor with a volt meter, if the compressor is getting proper voltage then check the relay. But this sounds like a problem with the compressor

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The light indicates the need for a new battery (9V)