The short answer
On a Thermador refrigerator this is usually a cracked, displaced or overfull drain pan rather than the water supply line or its fitting. The first checks below cost nothing and need no panel off; the one at the bottom of the list is a service call.
What you actually observe
- Water pooling on the floor in front of the unit — The most reported version, and the least informative: water travels before it shows, so the puddle is rarely under the source.
- 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: the unit is also not cooling — Cooling comes first. The water is downstream of that fault, not a separate one.
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 here, for a reason specific to Thermador: a flush-set unit is levelled once at install, and the cabinet keeps whatever error was built in that day.
- 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. Next, and relatedly: the heavier the unit, the more the install carries, and a heavy unit settles into its feet over time.
- 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. Third: water that cannot leave comes back, and it comes back somewhere you did not choose.
- 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. Bottom of the list on purpose: what arrives at the machine sets the ceiling on what the machine can do.
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.
- Look for standing water under the crispers and ice on the freezer floor — Those two together name the drain before anything is opened.
What an owner can safely check
- 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
- Find the drain hole at the base of the freezer rear panel and flush it with warm water — Do not push anything sharp into it. Warm water and patience clear most of these.
Tools: warm water, a turkey baster or small funnelAbout 30 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.
Before you open anything
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.
Where the owner fix ends
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.
Closest pages to this one
What this page does not cover
This page is about the Thermador 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.
