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Common Problems

Ice on the Back Wall of Your Fridge Is Normal — Here Is When It Is Not

Ice on the rear wall of the refrigerator compartment that appears while the compressor runs and clears while it rests is normal, and Liebherr says so in its own manual: humidity in the compartment condenses on the rear wall and freezes during the cooling process, then defrosts during the compressor idle period and drains away for evaporation. That is the appliance working, and it is the single most common reason people call about a cabinet with nothing wrong with it. Three versions of it are not normal. Ice that never clears between cycles means the defrost side has stopped keeping up. Ice thick enough to touch shelves or drawers means the same thing further along. And water collecting in the bottom of the cabinet rather than draining away means the condensation is forming correctly and the drain has blocked — which is a maintenance job rather than a repair. Frost inside a NoFrost freezer compartment is a different matter entirely and is always worth a call, because that compartment is designed not to accumulate any.

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The full guide

Common Problems By Appliance Content Team Last checked 3 minute read

The manufacturer's own words

Liebherr freezer ice build up and ice on the back of a refrigerator are two different questions, and the maker answers the second one itself.

Ice on the rear wall over one compressor cycle Top: two pictures of the same rear wall. While the compressor runs, humidity condenses and freezes on it. While the compressor rests, that ice thaws and the water runs down to the drain. Below: three pictures that are not that cycle — ice that never clears, ice that reaches the shelves, and water collecting in the base because the drain has blocked. ONE CYCLE, AND IT IS THE WHOLE TEST COMPRESSOR RUNNING moisture freezes on the coldest surface there is rests to the drain COMPRESSOR RESTING it thaws and drains away for evaporation DIFFERENT MORNING TO EVENING the appliance is doing what the manual describes AND THE THREE THAT ARE NOT IT NEVER CLEARS running or resting, the ice is there — defrost is behind IT REACHES THE SHELVES the same thing further on, and now blocking airflow WATER IN THE BASE the ice is behaving; the drain has blocked
Look once while it runs and once while it rests. If the picture changed, nothing is wrong — and that is the single most common unnecessary call on this equipment.

From the Liebherr manual, in its troubleshooting table, as a row of its own:

> Ice or water drops appear on the rear wall in the interior of the refrigerator compartment. This is completely normal. During the cooling process, the humidity in the refrigerator compartment will condense on the rear wall and freeze. During the compressor idle period, the ice layer will defrost. The condensate on the rear wall drains through the defrost water drain for evaporation.

That is not us reassuring you. That is the maker putting a "nothing is wrong" row in its own problem-solving table, because enough people ask.

Why it happens more here

Humidity. A refrigerator in Miami is opened into a room carrying far more moisture than the same appliance in a dry climate, and every opening brings some of it in. More moisture in, more condensation on the coldest surface, more visible ice.

A cabinet in a kitchen that opens to the outside does this most of all.

Watch one full cycle

This is the test, and it costs nothing.

A manual defrost clears the ice; how fast it returns is the diagnosis A manual defrost removes the ice from any cause. What happens afterwards separates them: ice back within a few weeks means the defrost system itself has stopped and needs a technician; ice back after a few months points at a door seal or airflow, which is usually fixable; ice that does not return means whatever was fixed was the cause. Writing down the date is what makes the difference readable. MANUAL DEFROST empty it, switch it off, let it melt · half a day WRITE DOWN THE DATE this is the whole test CLEARS ICE FROM ANY CAUSE THEN WAIT — AND SEE WHICH ONE YOU HAVE BACK WITHIN A FEW WEEKS — the defrost system heater, sensor or control · needs a technician — and it will return BACK IN A FEW MONTHS — air is getting in a door seal, a drawer not closing, a door held ajar · usually yours to fix DOES NOT COME BACK — you already fixed it whatever you changed before defrosting was the cause Where the ice was is the other half: the back wall means the defrost system, the door line means air getting in, a sheet under the freezer floor means the drain.
The procedure works on all three causes, which is exactly why doing it tells you nothing on its own. The date does.

While the compressor runs, ice forms on the rear wall. While it rests, that ice should thaw and run down to the drain.

If you look in the morning and again in the evening and the picture is different, the appliance is doing what the manual describes.

The three versions that are not normal

It never clears. Ice is there whether the compressor has been running or resting. The defrost side is not keeping up.

It reaches the shelves. Same problem, further along, and now it is also blocking airflow — which produces a cooling complaint on top of the ice one.

Water collects in the bottom instead. The condensation is behaving; the drain is not. That is a blocked drain and it is usually warm water and five minutes.

And the one that is always a problem

Frost inside a NoFrost freezer compartment.

That compartment is specifically designed not to accumulate frost. When it does, the defrost circuit has stopped, and the reason to act is not tidiness — ice on an evaporator insulates it from the air it exists to cool, so a frost problem quietly becomes a temperature problem.

What we do when we are called out to this anyway

Plenty of people read all of the above, watch a cycle, decide it is not clearing and call — and they are right to. Here is what the visit actually consists of, because it is short and it is worth knowing in advance.

The first thing looked at is the drain, because a blocked one produces exactly the picture people describe: condensation forming correctly, ice building because the meltwater has nowhere to go, and water in the base of the compartment. That is a clearing job rather than a repair.

The second is the door, because a seal that has stopped gripping brings humid Miami air in continuously, and no defrost cycle is designed to keep up with that. The paper test settles it in two minutes.

Only after those two does anything get opened up. Ice that is genuinely a defrost-circuit problem looks different — it does not clear at any point in the cycle, it forms on the evaporator rather than the rear wall, and it is usually accompanied by a compartment that has started to drift warm. Three checks, in that order, and most visits end at the first.

If it turns out to be a repair

Every job on this site is priced the same way: an on-site diagnostic first, the figure agreed in writing before anybody starts.

  • The rear panel of a freezer compartment unscrewed and set aside, the evaporator coil behind it buried in a solid block of white ice so the fins are barely readable, the fan blade above it frozen in place.
    Some of it is documented as normal

    Ice building up inside

    Where the ice is decides whether this is a problem at all. On the rear wall of the refrigerator compartment the maker calls it completely normal; in a NoFrost freezer, or thick enough to reach the shelves, it is not.

    • On the rear wall of the fridge
    • In a NoFrost freezer compartment
    • Thick enough to touch shelves or drawers
    What it usually means
  • A technician kneeling at the base of a tall refrigerator with the lower panel off
    from $185

    Refrigerator cooling and defrost repair

    The cabinet runs but does not hold temperature, or holds it in one compartment and not the other. On a NoFrost appliance that is usually the defrost circuit or the airflow rather than the compressor — and telling those apart before ordering anything is the whole job.

    • One compartment warm while the other holds
    • Frost where the manual says there should be none
    • Temperature that drifts rather than fails outright
    What this involves

Questions people ask about this

Why is there ice on the back of my fridge?

Because humidity in the compartment condenses on the coldest surface and freezes while the compressor runs. The maker describes exactly this and calls it completely normal. It should thaw while the compressor rests and drain away.

How do I know if it is too much?

Watch it over a full cycle. Normal rear-wall ice clears while the compressor is off. Ice that is still there when the appliance has been resting, or that has grown enough to touch a shelf, is not clearing and is worth looking at.

There is water in the bottom instead.

Then the ice is forming correctly and the drain has blocked, so the meltwater has nowhere to go. That is a drain-clearing job and it is usually warm water and five minutes.

My NoFrost freezer has frost in it.

That one is always worth a call. A NoFrost compartment is designed not to accumulate frost, so frost accumulating means the defrost circuit has stopped — and left alone it becomes a cooling problem, because ice on an evaporator insulates it from the air it is meant to be cooling.

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Tell us the model number and what it is doing.

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This article is based on:

  • Official manufacturer documentation
  • Internal repair procedures
  • Technician repair history
  • Company quality standards
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