Sub-Zero Ice Buildup On Back Wall
Ice Buildup On Back Wall is usually one of a small number of specific, repairable causes — here's what to check and when it's worth calling a professional.
Common Causes
Hard water plus a hot garage
7.2 grains per gallon scales the fill side while ambient heat loads the sealed side; undercounter units in a garage see both at once.
A blocked or frozen water supply line
Shows up as slow or stopped production, and is a plumbing-side issue rather than the ice-making mechanism itself.
A worn ice maker motor or mold assembly
The mechanical components that form and eject cubes wear out gradually.
What You Can Check Yourself
Parts That Most Likely Need Replacing
Based on symptoms like this, these are the components our technicians check first. The exact part depends on your model and what we find during diagnosis.
In and around Pleasanton
Pleasanton — Tri-Valley town of large newer lots, where Ruby Hill and Kottinger Ranch carry full built-in suites and wine rooms as standard rather than as an upgrade. We also cover Dublin, Livermore across Tri-Valley.
ZIP codes we cover in Pleasanton: 94566, 94586, 94588
Most cases like this are fine to schedule within a day or two, though it's worth having looked at before it gets worse. If you're seeing a code on the display alongside this issue, our Sub-Zero error code guide can help narrow down the cause before we arrive. Either way, our repair service covers same-day diagnosis and a flat-rate quote before any work begins.
Common Questions About Ice Buildup On Back Wall
Can I keep using my Sub-Zero appliance while this happens?
Will ice buildup on back wall go away on its own?
How much does this repair typically cost?
How long does a typical repair visit take?
Do you offer a warranty on the repair?
Do you service Sub-Zero appliances in my area?
Still having this issue?
Same-day diagnosis, genuine OEM-compatible parts, warranty of up to 1 year.
*SubZero Repair Walnut Creek is an independent repair company and is not affiliated in any way with Sub-Zero, Inc., Wolf Appliance, Inc., or any of their distributors. We are not a factory service provider and specialize exclusively in out-of-warranty appliance repairs.