The short answer
A refrigerator makes water on purpose — every defrost cycle produces it — so on the HS line a leak is usually a drainage problem rather than a plumbing one. Where the water shows up is most of the diagnosis: inside under the drawers means the drain, at the front on the floor means the drain has already overflowed, and behind the cabinet with a dry interior means the supply. On this page the checks are ordered by where you are standing, which saves moving the cabinet twice.
The observations that matter on the HS line
- Drips down the inside of the door or the frame — Condensation from room air meeting a cold surface, usually a seal question rather than a leak.
- A puddle at the front of the cabinet, on the floor — The internal trough has filled and is running out under the door.
- NEAR MISS — water plus a cabinet that is warming up — Deal with the cooling first.
What is usually behind this on the HS line
- The water supply line or its fitting is weeping behind the cabinet — Ranked first on the HS line because the tell is unambiguous: a dry interior with a wet floor behind the unit can only be the supply, and it is visible with a torch and two minutes.
- The defrost drain is blocked or frozen, so melt water backs up — A silted or frozen drain channel sends every defrost cycle into the compartment instead of the drip tray. It ranks here because the checks above it are quicker, not because it is uncommon.
- Condensation from a door that is not sealing, or a cabinet out of level — A cabinet leaning back drains its trough correctly and one leaning forward does not; a gasket that has taken a set lets humid air in continuously. Both make water with no broken part anywhere.
- The filter housing is leaking, usually after a change — Last of the plumbing causes here, and only relevant if a filter is fitted at all — but if one is, check it before accepting any expensive diagnosis.
What to check first, second and third
- First — pull the cabinet out and look at the supply joint with a torch — Dry the fitting, lay a sheet of paper under it and come back in an hour. A wet sheet names the joint with no tools and no guesswork.
- Then — find the drain outlet at the back of the compartment and flush it — Take the drawers out, find the trough and ease warm water down the outlet until it runs away freely. Nothing sharp: the channel is soft and a punctured one leaks permanently.
- Only then — close the door on a sheet of paper, and check the cabinet is sitting level — Paper that pulls out freely means the gasket is not sealing. A cabinet tipped forward will not drain its trough, which puts water inside without anything having failed.
- STOP here if the next check needs a panel off or a meter on live terminals — Everything above can be done with nothing dismantled; past it the checks need test equipment.
Safety first
Safety
Water and electricity share this space. Unplug the appliance or switch off its breaker before mopping under or behind it and before any panel comes off — a capacitor can hold a charge after the power is off. Do not run an extension lead across a wet floor to keep the cabinet going, and turn the water supply off at the shut-off before disturbing any fitting.
When to call a technician
Call when the drain will not clear with warm water, when the leak is at a plumbing joint you cannot reach or re-make, or when water keeps arriving a day after the ice maker was switched off. On the HS line, call rather than continue if the drain channel has to be reached from behind the evaporator cover. Call immediately if water is reaching an electrical connection, if the flooring is lifting, or if there is water plus a warming cabinet — that pair is the defrost system and it will not settle on its own.
Other faults covered for the HS line
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
