The short answer
On a frost-free cabinet of this age the drain has had decades of debris put through it, and that is where the water stops. Ranked first on this platform: A blocked defrost drain. The checks below follow that ranking, and the first of them need no tools and no panel removed.
What you observe
- A sheet of ice across the floor of the cabinet under the baskets — Ice on the floor of a freezer is water that could not get out.
- A single large flood rather than a steady trickle — Volume distinguishes accumulated melt from an ordinary drain fault.
- Water at the front of the cabinet and a door that swings open on its own — The door behaviour and the wet floor share one cause.
- NEAR MISS — the outside of the cabinet is wet rather than the floor — Condensation on the shell is a humidity and seal question rather than a drain one.
Causes, most likely first on this platform
- A blocked defrost drain — A frost-free freezer melts its coil clear on a schedule, and every drop of that water leaves through one small trough and one small hole. It ranks first on this platform because the trough and the hole at the back of the compartment are the narrowest part of the whole machine, and on a cabinet of this vintage they have been collecting for long enough that a blockage is the expected outcome rather than a surprise.
- A defrost fault producing more water than the drain can take — When defrost stops working, ice builds for weeks. It ranks second here because defrost is run by a timer and a terminating thermostat rather than by an algorithm, so it fails as a hard stop rather than as a gradual drift, and the ice it leaves behind is the symptom the owner actually sees.
- The cabinet tilted forward — Drains and troughs assume the cabinet is level or tipped very slightly back. Ranked third: worth checking once the causes above have come back clean.
Check in this order, and why
- Take the bottom basket out and look at the floor and the trough at the back — It locates the fault inside the cabinet without tools. It leads because it tests the top-ranked cause.
- Ask what happened in the day before the flood — A power cut, a holiday or a repair in the history explains it completely. Tests the second-ranked cause.
- Put a spirit level on top, front to back — Two minutes, and it saves a wasted parts order. Tests the third-ranked cause.
What an owner can safely check
- Defrost the cabinet fully, then flush the drain with warm water from inside — Warm water rather than anything stiff — the tray behind it punctures easily.
Tools: warm water, towelAbout 40 min
- Adjust the feet until it sits level side to side and slightly back — A correctly set door swings gently closed from half open.
Tools: spirit levelAbout 20 min
- STOP before anything behind a fixed panel, and note what each check showed — Everything past this line is measured rather than looked at, and measuring it safely needs the power off and a meter.
Before you start tracing it
Safety
Unplug the appliance or switch off its breaker before removing any panel or reaching into the base — a capacitor can hold a charge after the power is off, and water in a live machine compartment is the one combination that deserves real caution.
When to call a technician
Call when the drain will not clear from the cabinet side, when the water is coming from behind a sealed panel, or when a defrost fault is putting more water into the cabinet than the drain was ever meant to carry.
Nearest pages of this class
What this page does not cover
This page is written for the Moffat freezer as a class, not for one family or one model line. Where a family- or model-specific page exists for your unit, that page is the more specific answer and the one to read first. Deliberately not here: part numbers, wiring colours and disassembly order, which differ by family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
