So you've just taken delivery of a new refrigerator. Congratulations! Now it's time to install it in the nicest spot of your kitchen, ready for all those admiring glances and chilly vegetables.

If your refrigerator is giving you trouble—your water dispenser has slowed to a trickle, your icemaker keeps jamming, or worse, you open the door and get hit by a warm breeze—you’re probably wondering ...