The short answer
On the BBB family water inside the cabinet and water on the floor are two different faults. The first is a blocked defrost drain; the second is usually a supply connection. The brand-generic page runs them together and this one does not.
What you observe
- A sheet of ice on the floor of the compartment — Same fault caught later, once the pooled water has frozen.
- Water on the floor at the front — The cabinet floor slopes forward, so a rear leak arrives at the front.
- A crackle of ice under the drawers before any water appears — The early stage of a blocked drain, caught before the water reaches the floor.
- Water appearing a day or two after the unit was moved — A displaced drain pan or a strained supply connection rather than a drain fault.
- NEAR MISS - condensation on the outside of the doors — That is humidity and seal performance, not a leak.
Causes, most likely first on BBB
- Water supply connection or line — Ranked first on the BBB family: the supply runs through a built-in housing where it is hard to inspect and easy to pinch. These codes share an evaporator arrangement and a defrost scheme, so a finding on one is worth assuming on the rest. This moves above blocked defrost drain, which leads the brand-generic order, because these models share one layout, so its weak point shows across the whole family.
- Blocked defrost drain — Second: defrost melt water has exactly one way out, and when that channel closes the water simply backs up into the lowest part of the cabinet.
- Drain pan cracked or displaced — Third: the pan is under the housing and is rarely inspected, so an overflow shows as a floor leak with no visible source.
- Door seals and condensation — Fourth: a heavy built-in door can drop on its hinges and leave a corner gap that condenses continuously.
- Ice maker fill valve or its tubing — Last: last, and the valve sits at the back of the housing where the leak travels before it shows.
Check in this order, and why
- Empty the compartment and find the drain opening — It is the likeliest cause and it is visible once the shelves are out.
- Flush the drain channel with warm water — It confirms the diagnosis and clears most blockages in one step.
- Check the cabinet is level and tilted very slightly back — A cabinet leaning forward sends melt water towards the door instead of the drain.
- Test the seals with a sheet of paper around each door — Last, because it explains condensation rather than standing water.
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. Refrigerant work is licensed work, so leave the whole sealed system to a licensed technician, and call at once if you see oil at the compressor or smell burning.
When to call a technician
Call when the drain keeps blocking after being cleared, because that usually means the drain heater or the defrost circuit is at fault rather than the channel itself.
Other BBB pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
