The short answer
What you are seeing on a Thomson refrigerator most often comes back to a cracked, displaced or overfull drain pan, with the cabinet tilted so water runs the wrong way behind it. Work the order below rather than the price list: the cheap causes here are also the common ones.
What you are seeing
- Ice building on the freezer floor under the food — Meltwater freezing where it lands because the drain below it is closed.
- A wet patch only after a hot day or a big shop — Condensation rather than a leak: more humid air in, more water out, and the drain cannot keep pace.
- NEAR MISS: water only appears when the dispenser is used — That is the dispenser line or its fitting, not the defrost system.
Causes, most likely first on this build
- A cracked, displaced or overfull drain pan — The pan under the unit is meant to evaporate what the drain delivers. Cracked or knocked out of place, it delivers it to the floor. First on Thomson because a compact unit is carried in and set down, never really installed, and nobody re-checks it once it is loaded.
- The cabinet tilted so water runs the wrong way — The drain trough only works if the cabinet leans very slightly back. Tilted forward, meltwater runs into the cabinet instead. Second, because the feet and the frame are the cheapest parts here, so the install drifts sooner than on a heavier machine.
- The water supply line or its fitting — The line to the ice maker and dispenser is under pressure the whole time. A weeping compression fitting drips slowly and steadily. Third: a compact unit is often fed by a temporary or tap-mounted connection rather than a permanent plumbed line.
- A blocked defrost drain — Every defrost makes meltwater that must reach the pan underneath. Blocked, it backs up into the cabinet and finds the floor. Bottom of the list on purpose: the drain path is short and narrow on this build, so it blocks with less debris than a wider one needs.
What to check first, second and third
- Pull the unit out and look at the pan under the compressor — A pan out of its seat is visible in seconds and free to fix.
- Check whether the unit leans very slightly back, as it should — A forward tilt turns a working drain into a non-working one.
- Dry the fitting at the back and the inlet valve, then check again after a few hours — A dry test is the only way to catch a slow weep.
The checks you can do yourself
- Pull the unit forward and check the drain pan is seated, whole and not overflowing — Look for a crack at the corners. An overfull pan on a cool day is normal, a cracked one never is.
Tools: a torchAbout 20 min
- Check the tilt and adjust the front feet so the cabinet leans very slightly backwards — This also helps the doors swing closed on their own.
Tools: an adjustable spannerAbout 20 min
- Dry the shut-off, the fitting and the inlet valve completely, then re-check later — Wet again with the unit untouched means a supply fault, not a defrost one.
Tools: paper towel, a torchAbout 20 min
- STOP HERE if the next step means a meter on the inlet valve terminals — Testing a valve coil with the machine live is where an owner check ends and a service call begins.
Safety first, and it is not a formality
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Get help before pulling the cabinet out: a loaded unit runs away from you on a hard floor and the supply line behind it tears easily. Never open sealed-system tubing.
When this stops being a do-it-yourself job
Call when the drain will not clear with warm water, when the pan is cracked, or when water keeps arriving after the supply has been off for a day. Call the same day for water near the power cord or a socket: that is not something to leave running while you work through a list.
Where to go next in this class
What this page leaves to a more specific one
This page is about the Thomson refrigerator as a class, not one family or model line. Where a family-specific page exists for your unit it is linked below and it is the more precise answer. Not here on purpose: drain routing diagrams, valve part numbers and heater specifications, which differ between families.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
