What is going on
You are right to treat a leaking refrigerator as urgent, and there is good news to go with that instinct. A Sub-Zero leaking water is among the most common calls we take, and it is fixable. What you see on the floor is usually one small system asking for attention, not a refrigerator that is failing. Set a towel beneath the unit and let us handle the rest.
Sub-Zero builds most of its refrigeration around dual compressors, precise defrost cycles, and a sealed system engineered to hold temperature within a degree. Water on your floor usually traces to one of four places: the defrost drain, the door seal, the water inlet, or frost melting faster than the drain can carry it away. A factory trained technician reads the unit's diagnostic codes, inspects each of these systems in sequence, and confirms the true source before replacing anything. That is how a leak gets fixed once, not managed twice.
The usual suspects
What causes it in a Sub-Zero.
Defrost drain line
Sub-Zero refrigerators run automatic defrost cycles, and the meltwater exits through a drain line into an evaporation pan. Mineral scale or debris blocks that path, and water backs up onto your floor. Our technician clears the line, verifies flow, and tests the drain heater.
Door gasket and seal
The magnetic gasket keeps warm, humid air out of the compartment. When it hardens or loses contact, moisture condenses inside and drips into places it should not. Our technician measures the seal and fits genuine Sub-Zero gaskets matched to your model.
Water inlet system
The inlet valve, fill tube, and supply line feed your ice maker and dispenser. A weeping valve or split tube leaks slowly behind the unit, often unnoticed for weeks. Our technician pressure tests the full water path and replaces the failing component with genuine parts.
Humidity and frost melt
When a defrost heater or thermostat weakens, frost builds on the evaporator, then melts in volume the drain cannot carry. The result is water inside the compartment or on the floor. Our technician tests the defrost circuit and restores the cycle Sub-Zero intended.
A Sub-Zero is built around sealed refrigeration engineering that general technicians rarely see. A generic part that almost fits will leak again, and each repeat repair asks more of the machine. Factory trained diagnosis identifies the true fault, fits genuine components, and protects the investment built into your kitchen. That is the difference between a repair and a recurring problem.
Protect your kitchen
Water finds hardwood faster than you expect
Beneath a built in refrigerator, a slow leak moves under cabinetry and into hardwood seams long before anything shows on the surface. Put a towel down, note when the water appears, and call us. We schedule same day visits daily from 7am to 7pm across the Peninsula, from Burlingame to Redwood City and Half Moon Bay, and every technician works cleanly, with white glove care for the floors and panels around your unit.
Why Onyx
The care your kitchen deserves.
Factory trained specialists
Vetted, uniformed technicians who work on Sub-Zero and Wolf and nothing else.
Genuine factory parts
Only Sub-Zero and Wolf OEM components, sourced direct. No aftermarket substitutes.
White glove home protection
Floors, stone, and cabinetry are draped and protected before a single panel comes off.
$95 diagnostic, waived with your repair
One flat diagnostic visit. Go ahead with the repair and the diagnostic costs you nothing.
Concierge scheduling
One point of contact, arrival windows kept, and updates by text or call, whichever you prefer.
Licensed and insured
Bonded and fully insured on every visit. Documentation ready on request.
Questions, answered
Before you call.
How fast can you get here?
Same day in most cases when you call before early afternoon. A leaking refrigerator moves to the front of our schedule. When you call, we confirm a realistic window, and your technician arrives with the parts this repair typically needs, so most leaks are resolved on the first visit.
Should I do anything before the technician arrives?
Very little. Lay a towel where the water collects and note whether the pooling is constant or comes and goes, since that timing helps the diagnosis. Leave the refrigerator running so your food stays protected. There is no need to pull the unit out or open any panels.
Why is my Sub-Zero leaking inside the fresh food compartment?
Water inside the compartment usually points to the defrost drain. Sub-Zero units shed frost on a precise cycle, and when the drain path clogs, meltwater collects under the crisper drawers instead of reaching the evaporation pan. Our technician clears and tests the full drain path so the cycle runs as designed.
What does the visit cost?
$95 diagnostic, waived with your repair. Your technician identifies the source of the leak, explains the finding in plain language, and quotes the full repair before any work begins. Every repair is covered by the 3 Year Onyx Warranty on parts and labor, in writing.
Will you tell me if it is not worth repairing?
We repair, and we do not push replacements. Sub-Zero builds these machines to serve for decades, and a water leak is rarely a reason to retire one. Our technician gives you an honest assessment of the unit's condition and a clear recommendation, and the decision stays yours.
Do you offer same day service outside San Francisco?
Yes. We provide same day appointments across San Francisco and the Peninsula, from Belmont and Foster City to Redwood City. We work daily from 7am to 7pm, and the earlier you call, the more likely we reach you the same day.
The Onyx guarantee
The 3 Year Onyx Warranty, parts and labor, in writing.
A $95 diagnostic, waived with your repair, and 24 years on luxury appliances behind every visit.
Other faults we cover
Something else acting up?
See every fault we fix on Sub-Zero and Wolf.
Same day service · San Francisco & the Peninsula
Your peace of mind is one call away.
One number, and it is handled, from diagnosis to a kitchen that simply works again.
$95 diagnostic, waived with your repair.