The short answer
On a Bourdeau cellar, frost and over-chilled bottles usually mean the setting is closer to a drinks fridge than a cellar, or that humid air is entering past a door that no longer seals. Bottles touching the cold wall freeze first whatever the setting. None of it is a sealed-system fault.
What you observe
- Frost on the cold surface at the back of the cabinet — Moisture from room air freezing on the coldest thing available.
- A bottle at the back far colder than the rest — Contact with the cold surface rather than general over-cooling.
- Condensation running down the inside of the glass — The same humid air on a surface that is cold but not freezing.
- Frost that rebuilds within days of being cleared — Air is still entering, so clearing it changes nothing.
- NEAR MISS - a light bloom after a humid week — Normal, and it clears on its own.
Causes, most likely first on this brand
- A setting closer to a drinks fridge than a cellar — First. Wine storage sits well above a beverage setting, and every step colder keeps the cold surface below freezing for longer, which is exactly what makes frost.
- A door that does not seal or self-close — Second. A heavy glass door on a settled hinge, or a gasket fouled with dust, lets a continuous ribbon of humid air into the cabinet.
- Bottles pressed against the cold surface — Third, and not a fault at all. Glass touching the cold wall conducts far better than the air around it.
- A cabinet standing out of level — Fourth. A cellar that does not pull its own door shut exchanges air every time somebody walks past it.
- A sensor reading wrongly — Last. Genuinely uncommon, and worth considering only once the four above are ruled out.
Check in this order, and why
- Compare the setting with a wine storage range — A cellar set for cans will frost, and that is not a fault to repair.
- Watch the door close from half open — A door standing proud explains frost that keeps coming back.
- Look at what touches the cold surface — Contact chilling is not a fault.
- Clear the frost and time its return — Days means air is entering; weeks is ordinary service.
What an owner can safely check
- Set the cabinet to a wine storage temperature — Move it one step at a time and give it a full day between changes.
Tools: fridge thermometerAbout 30 min
- Clean the gasket and its channel — Wipe right round with warm water, clearing dust from the groove the gasket sits in.
Tools: cloth, warm waterAbout 20 min
- Level the cabinet with a slight backward tilt — So the door falls shut on its own rather than standing open.
Tools: adjustable wrench, spirit levelAbout 25 min
- Draw the bottles forward off the cold wall — Leave a finger's width between glass and the cold surface at the back.
About 15 min
- STOP HERE if frost returns in days with a sealing door — A sensor fault needs live testing.
Before you open anything
Safety
Switch the cabinet off at its breaker before defrosting or removing any panel - a built-in may be hardwired and a capacitor can hold a charge after the power is off. Never chip frost off the cold surface with a knife or screwdriver: a puncture ends the appliance, because the sealed system cannot be repaired at home. Empty the shelves before tilting or moving a loaded cabinet.
When to call a technician
Call when the setting is in a wine range, the door seals and self-closes, nothing touches the cold wall and frost still rebuilds within days. That points at a sensor or control rather than at use. Call as well if bottles chill hard at the warmest available setting, because a control that no longer regulates will not improve with better habits.
Nearest pages of this class
What this page does not cover
This page covers the Bourdeau built-in single-zone wine cellars, which have no icemaker. Countertop wine coolers frost for slightly different reasons and have their own page, linked below. Deliberately absent: wine storage temperature ranges, sensor part identifiers and humidity ratings, which differ by family and by what you are storing.
Links: - [Brevino countertop wine cooler frosting up inside](/blog/brevino-refrigerator-ice-production-2)
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
