My compressor for my kenmore elite fridge SF43C72RAU6 R134a is making a knocking/pinging sound from within unit

SOURCE: Kenmore Refrigerator making loud noise

Does the sound occur when the compressor is starting or shutting down? and only lasts for a couple of seconds? I had one do the exact same thing. Sometimes it would also wake me up at night. If so, I'm afraid he is right. On the bright side, it worked fine for years. I gave it to a girlfriend when I purchased a bigger one and it is still working today. The only thing you can do is change the compressor, which is probably not $$ practical.

SOURCE: Loud buzzing noise from inside Jenn Air 2389G fridge

i don't know jennair specifically being from england.
however, there is often a fan inside the back panel and the noise you heard was the fan hitting ice. the reason now not heard and fridge not working may be that the ice has built up so much the fan is jammed

SOURCE: refrigerator knocking noise

the motor could be on the way out. Put your hand (carefully) on the motor (back of the refridgerator), if it is too hot to touch then the motor is burning out and will need to be replaced.

SOURCE: Kenmore Elite Refrigerator 59676264700 loud clicking noises

check for bad relay

SOURCE: funny fridge noise, kenmore elite trio

I have a Kenmore Elite Trio and the freezer was making a frog sound. I found the solution.

My model number is 596.75523400. The sound will stop when the freezer is opened. It will stop again when the freezer drawer is open and the light switch is pressed to turn off the light. The ice drawer was full but it had stopped making ice.

Here is the fix in less than 10 minutes using only a screwdriver.

• Take out the two freezer baskets
• Remove the freezer door from the two slide tracks.
• Unplug the icemaker electric connection at the back wall. Depress the clips on the side of the plug and wiggle it loose.
• There are 3 screws that attach the icemaker to the left freezer wall. Remove the lower screw and unscrew the top two about ½ way out.
• Slide the icemaker up so the slots slip over the 2 screws.
• Put the icemaker in the sink and run a bit of water on the frozen cubes until they fall out.
• Take the screwdriver and check the water inlet hose/pipe for ice that obstructs the flow of water into the ice maker.
• Re-mount using the 3 screws and plug in the electric connector. Make certain the water inlet tube is positioned thru the retaining hole before you remount the screws.
• Replace freezer door and baskets.