The ice sheet eating your freezer: the paper test, the hidden drain hole, the defrost that works

Frost inside a freezer is a weather story, not a freezer story: every door-open admits warm, moist air, and the walls are where that moisture is told to leave. A millimetre of frost is normal; an ice sheet that won't let the top drawer close means the machine has been told to make weather too often, and the three causes are the seal, the drain, and the door habits - in that order of cost to check.

Two minutes of diagnosis before any ice comes out

• The note test: a sheet of paper clamped in the closed door should resist an even pull; slides out loosely and the gasket is done - clean its face first (spilled syrup glues and mimics a bad seal), check for the split along the curve where the hinge side folds, and if it's only soft and deformed at one corner, a hairdryer at arm's length for thirty seconds can re-fluff it back to sealing for months before a replacement strip is needed.
• The drain: a frost layer that runs mostly down the back inner wall with a puddle under the crisper lines in a fridge-freezer is a blocked defrost drain - the small channel at the back of the fridge compartment that feeds a pan over the compressor. Clearing it: warm water and a turkey baster, or the pipe-cleaner pass the manual politely omits; the ice that reforms in days after every defrost is this one hole, every time.
• The vents: in a frost-free unit, bags pressed against the internal vent grille turn the whole box into a defrosting machine - air has to travel from freezer to fridge and back, and the "packed to the lid" freezer is the ice cube maker nobody bought.

The defrost that actually ends it, in one morning

Empty it into the cool box with the ice packs, unplug, prop the door, towels at the threshold and a shallow dish of hot - not boiling - water on a folded cloth inside for twenty minutes with the lid open over it, and the sheet releases in one piece at the flex you work from the edges with a wooden spoon handle. The one hard law: no knife, no screwdriver, no razor against the liner - the evaporator's aluminium fins sit millimetres behind the plastic wall, and a puncture converts a free morning's job into a new appliance, and the gas inside into the atmosphere. Back on, let it pull to temperature empty for a couple of hours before re-stocking; refreeze nothing that sat soft (the outage rules from the fridge chapter carry the verdict there). And if the unit has no frost but a puddle inside the chest, you've found the crack in the liner or the pan under the compressor that caught the defrost water instead of drinking it - two more minutes, no ice involved.

The habits that keep the ice at a millimetre

Decide what you'll open the door for before the hand is on it; keep the top of the freezer clear so bags don't prop the lid ajar (the one-inch gap that grew an ice shelf is a visible tell from above, and a torch check costs nothing); hot food cools on the counter first - its steam is the moisture budget; the door's hinge side sags with age on some models - two millimetres at the corner and the gasket can't find it, and a hinge lift or an adjusted bracket puts the whole seal back. None of this is repair; it's just why frost builds at different speeds in identical machines - the house with five short opens and the house with one long stare.