The short answer
On a Transtherm refrigerator, a refrigerator makes water on purpose — every defrost cycle produces it — so a leak is almost always a drainage problem rather than a plumbing one. Where the water appears tells you which: inside under the crispers means the drain, on the floor at the front means the drain has overflowed, and behind the cabinet means the supply. A wine cabinet is tuned for stability, not for pull-down, so it fails softly: the band drifts long before anything sounds wrong.
What you are actually seeing
- Droplets on the inside of the cabinet after each opening — Condensation from room air, not a leak.
- Ice building under the ice bin — Fill water is overshooting the mould.
- A puddle appearing at the front of the cabinet on the floor — The inside trough has overflowed and is running out under the door.
- NEAR MISS — the leak only appears when the dishwasher or the sink runs — Then the water is not coming from the refrigerator at all. Check what shares that floor.
Causes, most likely first on this refrigerator
- Warm damp air entering past the door seal and condensing inside — Ranked first on Transtherm: a wine cabinet is managing humidity deliberately, so a failed seal shows as water long before it shows as a temperature fault. On this one, remember that the cabinet is tuned to hold a narrow band, so it drifts long before it fails.
- A dispenser valve that keeps weeping after it shuts — Second: it is small, it is slow, and it is the only cause here where the water arrives in the door rather than in the cabinet.
- Defrost drain blocked or frozen, so melt water backs up inside the cabinet — Third: the drain is the only part of this system that is designed to carry water, so it is the first place to look when water is somewhere else.
- Water escaping where the filter cartridge meets its housing — Ranked last here, deliberately: it usually starts right after a filter change, which makes the timing the diagnosis.
Check in this order, and why
- First — test the seal with a strip of paper all the way round the door — Free movement anywhere means room air is walking in at that point.
- Then — watch the dispenser for a minute after a draw — A drip that continues after the valve shuts names itself.
- Third — look for water or ice under the crisper drawers and at the back of the compartment — Water pooling inside the cabinet is a drain fault until proven otherwise, and nothing else looks like it.
- Only then — look at the filter housing and note whether the leak began after a filter change — Timing is the whole diagnosis here, which is why it comes after everything above it.
What an owner can safely check
- Test the gasket, then clean it and check the door closes square — Shut the door on a strip of paper at several points. Wash the gasket with warm soapy water; a stiff, dirty seal does not follow the cabinet.
Tools: paper, clothAbout 15 min
- Re-seat the filter and dry the housing — Remove the cartridge, check the seal is not twisted or missing, refit it firmly, then dry everything and watch for an hour.
Tools: clothAbout 10 min
- STOP here if the next thing to check is behind a fixed panel — Everything above can be done without tools on live parts. Past this point it is a technician job.
Before you open anything
Safety
Water and electricity share this space. Unplug the cabinet or switch its breaker off before you mop up anything under or behind it, and before any panel comes off. Do not run an extension lead across a wet floor to keep the unit going.
When it stops being an owner job
Call when the drain will not clear with warm water, when the leak is behind the cabinet at a plumbing joint you cannot reach or re-make, or when water keeps arriving after the ice maker has been off for a day. Call immediately if water is reaching an electrical connection, if the floor covering is lifting, or if there is water plus a rise in cabinet temperature — that pair means the defrost system, and it will not fix itself.
Nearest pages of this class
What this page does not cover
This page is written for the Transtherm refrigerator as a class, not for one family or one model line. Where a family-specific page exists for your unit it is linked above and it is the more specific answer. Deliberately not here: part numbers, wiring colours, torque figures and any measured value, all of 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.
