Refrigerator Using More Energy After Defrost? Fix the Temperature Setting and Door Gasket Seal

More Energy Use After A Defrost (and When It’s Not a Normal Thing)

What you usually notice a few hours after you finished that repair job or merely obligingly ran down to return groceries. Right after a defrost, which gets rid of frost, your refrigerator has to remove some extra heat and also some extra moisture. This can make a difference of an hour or so in run time and make the machine feel “busy” for hours. Naturally this shows up more if you did a manual defrost (dropped doors for a while) or if you put food away in it before cabinet temperatures got back to normal.

What’s not normal is if this keeps happening for days, if the cabinet pulls few degrees and swings widely, or if you notice something like this symptom: warm refrigerator temperatures, soft ice cream, frost returning, always, or visible condensation around the door. Two of the biggest causes of this are (1) refrigerator temperature cuts too low for the condition of the refrigerator and (2) weak door seals. First take these steps to restore temperatures (the right way): Many people turn the controls colder after a defrost, thinking that will make it “recover faster.” Usually, that will just hike the run time and energy use – with no improvement to food safety once you are in the safe range. A good goal is about 37°F (3°C) for the fridge compartment and about 0°F (-18°C) for the freezer.

Most refrigerators also need time to stabilize after changes. As a rule of thumb, make one change, wait about 24 hours, then judge results.

1. Reset controls to a “recommended/normal” baseline (or to 37°F fridge and 0°F freezer if you have digital controls on the appliance).
2. Put a fridge thermometer in a glass of water on the middle shelf and put a second thermometer between the frozen items in the freezer. This reduces the possibility of misleading changes due to how long the door is open.
3. Close doors and wait 24 hours.
4. Read both thermometers. If the fridge is higher than 40°F (4°C), adjust colder slightly. If it’s lower than about 35°F (1.7°C), adjust warmer slightly: “warmer” cuts energy use slightly, and also prevents fresh cold produce from occasionally freezing.
5. Repeat once per day until you’re consistently at around 37°F (3°C) in the fridge and about 0°F (-18°C) in the freezer.

Controlling the Fridge
Different types of temperature controls will convey different messages.
How do I “defrost” myself?
This is how to tell what type of control you’re dealing with, and make the best of it after defrosting.

Toasty? The compressor in variable-speed models may appear to run “a lot,” but pay little attention to that; if the door closes tightly and the temp readout is stable, that is what’s important.

How do I defrost?
Step 2: Set the thermostat correctly.
Again, “diagrammatic”ness kicks me in the backside; what else feeds into the thermostat is the more immediate question and I had to study a bit longer; this is what “I appreciate my door seals; you can stick a finger into mine” means to me.
Next we’ll take a look at the sealing of the door.

Step 2: Check door gasket sealing (the quickest stop to hidden energy waste). The sprocket on top won’t turn and that’s the way I like my refrigerator with energy efficiency.
Gasket: How do I get one in here? It’s important to knowing how to keep cold air inside our refrigerator, hot air out the room as always on a rainy Saturday morning when we’re running for cover; the door gasket (rubber “borracha” seal). Actually, after defrosting, when humidity is high, the dash is a disgusting sight. A pitiful schedule of dishonesty, though an intruder anyway—always ends in a mess.

Quick signs the gasket might be leaking

• You see condensation or beads of water around the edges of the door.
• There’s frost buildup near the door, or on packages near the perimeter.
• When you close the door, it doesn’t “grab” (you don’t get a little pull-in feeling).
• You see warped, torn, cracked or hardened rubber.
• The fridge runs almost all the time even though things seem to be cold enough.

Do the dollar-bill test (takes 2 minutes)

1. Open the door and shove a dollar bill (or strip of paper) across the gasket so half is “in” and half is “out”.
2. Close the door onto the bill.
3. As you pull it straight “out”, feel if there is steady resistance against it. That’s the seal.
4. Repeat this all the way around the door; top corners, hinge side of the door, the handle side, and then the bottom here and there in more than one spot.
5. If you find you can easily slip it out in one area, clean the gasket and test again. If you can easily slip the bill out in several areas, your gasket is probably defective or you may have alignment problems with the door.

OPTIONAL: flashlight test to be done at night, though good any time

1. Place flashlight in the fridge, inside spill-proof area at the bottom where the lens shines at the space where the gasket is located.
2. Turn kitchen lights off.
3. Go around the edges of the door and look for any light, which indicates your seal in that area is faulty.
4. If you see light, there’s a seal problem or perhaps you have alignment problems with the door.

Step 3: Clean the gasket and improve sealing (before you replace anything)

Many gaskets fail the test simply because they’re dirty. Sticky spills, crumbs, and grease can keep the gasket from achieving full contact, especially along the bottom edge. Cleaning is also the first step if you detect odors or mildew.

1. If you’ll be working around moving parts or electrical controls, unplug the refrigerator (or switch it off).
2. Combine mild dish soap in warm water.
3. Wipe the folds/creases of the gasket with a soft cloth, then use a soft toothbrush in the grooves.
4. Wipe again with clean water, then dry completely (moisture can encourage mold and may even freeze inside the freezer door seal).
5. Run the dollar-bill test in the exact same spots.

If cleaning didn’t help: check door alignment and closing force

• Make sure that shelves/bins are not preventing the door from closing fully.
• Make sure that the refrigerator itself is level (many doors self-close just a bit when properly leveled).
• Check hinges for looseness and be sure the door is not sagging (especially common on fairly frequently opened fridge doors).
• Don’t overload the door bins with heavy bottles; the weight of the bottles can twist the door over time.

Step 4: When you should replace the gasket (and how to know for sure)

If the gasket is torn, stays deformed, is very brittle, or doesn’t pass the dollar-bill test even after cleaning and checking the alignment, replace it. A leaky gasket is one of the most common reasons that your refrigerator keeps running longer than it should. Find your refrigerator’s exact model number (usually inside fresh-food compartment on a wall or neighboring door frame).

• Order the proper gasket for your exact model (your appliance maker’s parts Web site will help you match your model number).
• Read the service instructions for your model before removing the old and installing the new. Some gaskets press right in; others are held by a retainer, or other. Some may have screw-stud retainers under the loose inner door liner.
• Replace the gasket, then repeat the dollar-bill test. What did your temp read just now, and what does it read 24 hours later?

Extra checks that often count right after defrost (quick wins)

• Time it: a defrost or power off will require time (many hours) for cooling to proceed and stabilize.
• Don’t load hot food. Letting hot food items cool first means the refrigerator has less to work against.
• Keep all vents free of obstruction. A blocked vent means the compressor must run longer while some areas are still warm, while others remain cool.
• Clean the condenser coils (if you can reach them). If the coils are filthy, compressor run time can be considerably greater.
• For the first few hours after a defrost, not opening and closing the door often will help the refrigerator pull temperatures down and cool itself quickly.

How to learn you really did fix the energy problem

• Temperature check: confirm fridge remains below 40F (4C) and typically sits near 37F (3C) all day; freezer near 0F (-18C).
• Seal check: dollar-bill test of whole perimeter on both fridge and freezer doors.
• Energy check (optional): Plug your fridge into a consumer power meter for a few days to a week, check average kWh/day before and after. (Very short tests can be misleading if the room temperature changes significantly during them.)

Troubleshooting: what to do if it’s still using too much energy

• If temperatures are correct but it does not stop running, suspect a door leak or dirty condenser coils, a stuck defrost issue, or a failing fan or compressor component.
• If the fridge seems too warm but is running a lot of the time, suspect airflow blockage, a door not fully closing, or a refrigeration system problem.
• If heavy frost is rapidly returning (especially on the back of a no-frost freezer), that can mean a defrost system problem and typically needs servicing. If you smell burning, or hear irregular loud clicking repeatedly, or see water near electrical parts, or the unit can’t maintain no-food-booth-illness safe food temperatures, stop troubleshooting and call in a qualified appliance technician.

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