The short answer
Within the Blomberg BSBS refrigerator family the diagnosis takes a particular shape, and it is the access pattern of these models rather than the fault itself that decides it. Every refrigerator makes water continuously. The defrost cycle melts frost off the evaporator by design, and a leak complaint is nearly always a disposal failure rather than a plumbing one. Find where the water is before you look for why. The three locations barely overlap in their causes.
What you observe on these models
- The compressor compartment is damp — Melt has reached the bottom of the cabinet along a path it was never meant to take.
- A pool that appears while the family is away — A slow feed with no door openings to mask it, which is the easiest condition in which to catch a supply leak.
- Condensation on the outside of the door — A seal admitting humid air, which produces water in the room rather than in the cabinet.
- NEAR MISS — the cabinet is also warm — Water plus warmth is a cooling failure with melt as a side effect. Go to the cooling page first; the water will stop when the cooling is fixed.
Causes, most likely first on this family
- Drain pan cracked, displaced, or overflowing — Second on likelihood, and it often follows the unit being pulled out for cleaning — the pan catches and moves without anyone noticing.
- Defrost drain line blocked with debris or frozen shut — Ranked first because the drain is the only part of this system that has to work every few hours, every day, with no maintenance of any kind.
- Cabinet out of level, sending melt forward — Last on the list, and it rarely acts alone — it usually makes an already-marginal drain fail.
- How this ranking departs from the brand-level article — The brand-generic page ranks purely by frequency. On this platform the component that sits behind the most accessible panel moves up, because confirming it is quick and confirming the others is not — that changes the practical order even where the underlying frequencies are similar.
Check in this order, and why
- Lift the bottom drawer out and look at the cabinet floor under it — A channel holding water is a blocked drain caught before it overflows, and it is far easier to read than a wet kitchen floor.
- Check the supply connection at the back with a dry tissue — A slow weep leaves no pool and no trail. A tissue held at the fitting finds in seconds what looking for drips will not find at all.
- Establish exactly where the water is — Inside the cabinet, under the crisper, on the floor at the front, or on the floor at the back. These four locations have almost no causes in common.
- What this family's layout decides — The construction of these models determines what can be confirmed quickly and what cannot, and the order above follows that directly. It is not a generic checklist reordered; it is the sequence that this platform actually rewards.
Before you open anything
Safety
Isolate the appliance at the breaker first, then confirm it is dead before you commit to anything. Melt water and a compressor compartment are a bad combination, so keep the cloths away from the bottom of the cabinet while you work.
When to call a technician
Call when the evidence has narrowed and the next step has not. A cabinet that has been defrosted, cleaned, levelled and given clearance and still will not hold has told you everything a free check can, and the remaining branches all need instruments.
Other faults covered for this family
What this page generalizes over
What this page generalizes over is the set of Blomberg refrigerator models carrying the BSBS prefix. They share a platform and therefore a fault pattern; they do not share every part. Anything that varies model by model is deliberately absent, and the pages linked below give both the wider and the narrower view.
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