The short answer
The short answer for a Black+Decker refrigerator: partly formed cubes are a fill-volume problem, which means the freezing half of the machine is working. The supply valve and the filter are owner checks; a fill valve that is not opening fully is a part.
What you actually see
- No ice at all after a full day — A machine that has made nothing in a day has either no water, no cold or no permission to run.
- Cubes fused into one block in the bin — A block in the bin is a melt-and-refreeze cycle, which means the freezer section is warming between runs.
- The ice maker fills but never harvests — Water goes in, the mould stays full, and nothing drops into the bin.
Causes, ranked for this refrigerator
- Water filter clogged or overdue — Most likely — a restricted filter drops the flow enough to underfill the mould, which is exactly the hollow-cube complaint. If this is the answer, the rest of the list stops mattering entirely.
- No water reaching the fill valve — Common — no water is the second thing to rule out because it explains every no-ice complaint at once and costs nothing to check. Where this checks out clean, treat the next entry as the working theory rather than a possibility.
- Fill valve failing to open fully — Regular — the valve is an electrical part in a wet place and it fails partly open more often than it fails shut, which produces shrinking cubes over days. A clean result here does not just remove one part; it removes everything that depends on it.
What to check, in order
- First — the filter, where fitted — Bypass the filter if the cabinet allows it and watch the next few cycles.
- Second — the supply line and shut-off — Trace the line from the back of the cabinet to the shut-off and confirm the valve is fully open, not cracked open.
Checks an owner can do safely
- Step 1. Measure the freezer compartment temperature — Leave a thermometer in the compartment for several hours. A freezer holds food safely at 0 °F (−18 °C) or below, and a harvest cycle needs that cold.
Tools: freezer thermometerAbout 20 min
- Step 2. Check the supply valve and the line — Follow the line from the cabinet back to the shut-off. Open the valve fully and straighten any kink where the line passes behind the unit.
Tools: flashlightAbout 15 min
- Step 3. Listen for the fill valve during a cycle — A buzz at the back with no water arriving means the valve is being energized and is not passing water.
Tools: noneAbout 10 min
Before you open anything
Safety
Close the supply valve and unplug the appliance before a hose is touched. A capacitor can hold a charge after the power is off. Have towels and a shallow tray ready — a hose that has been under pressure will empty itself the moment it is loosened.
When this becomes a service call
The line is not about confidence, it is about what the next step needs. A fill valve that buzzes without passing water, or a supply line that has to be cut into, is where the owner checks stop.
Sources
General guidance- The Control of Hazardous Energy (Lockout/Tagout) — OSHA 1910.147 and manufacturer service manuals, fetched
- Refrigeration and Food Safety — USDA Food Safety and Inspection Service, fetched
Nearest pages
What this page does not cover
What follows is family-agnostic. It names the fault, ranks the causes and gives the order to check them, and it deliberately does not name a board revision, a part number or a model-specific tolerance. Those belong on the family and model pages beneath this one, which are linked under Related pages.
Related pages
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