A puddle under your refrigerator is almost always one of three things: the drain pan overflowed, the defrost drain clogged, or a water supply line sprung a leak. Here’s how to tell them apart.
The Drain Pan (Most Common, Usually Not a Crisis)
Every refrigerator has a drain pan in the base of the unit, just behind the front kick plate. It catches water that drips off the evaporator coils during the defrost cycle. Normally that water evaporates on its own, helped by heat from the compressor area and condenser fan airflow.
If the pan is overflowing, it usually means one of two things: the pan is cracked, or something changed that’s causing more water to collect than usual. High humidity is a real factor in the Bay Area, especially late spring through summer. If you recently moved the fridge, water can slosh out too.
You can do this check yourself: pull the kick plate off the bottom front, get a flashlight, and look at the pan. It’s a shallow plastic tray sitting in the base of the unit. If it’s full or cracked, that’s likely your source. A cracked pan needs to be replaced, and it’s worth having a tech handle the swap so the drain tube seating and tray fit get confirmed before everything’s closed back up.
Clogged Defrost Drain
This one shows up a lot in refrigerators a few years old. The defrost system melts frost off the evaporator coils on a timer, and that meltwater is supposed to flow down a drain tube into the pan underneath. If the tube gets plugged, water backs up, pools inside the freezer, and eventually spills out onto the floor.
Signs of a clogged defrost drain:
- Water on the floor under or in front of the fridge
- Ice buildup on the floor of the freezer compartment
- Water pooling inside the fresh food section
The drain can get blocked by food debris, ice, or mold. Clearing it requires pulling the fridge out, removing an interior freezer panel, and flushing the tube. More importantly, if the drain keeps re-clogging, there’s usually a reason. A bad defrost heater, thermostat, or control board will cause the drain to refreeze repeatedly. Clearing the drain in that case fixes the symptom but not the cause. A tech will flush the drain and test the defrost components in the same visit, so you’re not back in the same spot two weeks later.
Water Line Leak (Highest Urgency)
If your fridge has an ice maker or water dispenser, there’s a supply line running to it. It’s usually a small plastic or braided stainless line connecting to a shutoff valve behind the fridge. These lines can crack, kink, or pull loose at a fitting.
This is the one that needs attention right away. Even a slow drip causes real damage to flooring and subfloor over time. Pull the fridge out from the wall and look at the line and connections. If you see active dripping or a wet fitting, shut off the supply valve and stop using the ice maker and dispenser. Then call us. Supply line repairs look simple, but old plastic lines, corroded fittings, or connections inside a wall can turn a quick swap into a bigger job, and you don’t want to find that out after the floor is already warped.
How a Tech Diagnoses It
When our techs go out on a water-under-the-fridge call, the first move is to pull the unit out and check the supply line connection. That rules out the most urgent cause in about 60 seconds. Then they check the drain pan, look for ice on the freezer floor, and run a short defrost cycle to watch how water moves through the drain tube. Most calls are clear within the first few minutes.
If the defrost drain is clogged, they’ll clear it and test the heater and thermostat to confirm the cycle is running correctly. A simple clog is a quick fix. A failed defrost component takes more time but is still a standard repair.
When to Call
If you’ve looked at the drain pan and the water keeps coming back, or there’s a steady drip from the supply line, those aren’t situations to wait on. Same if there’s already water under flooring or you can hear dripping you can’t locate.
We cover the Tri-Valley and East Bay, and water calls get prioritized because of the damage risk. Book at adriumservice.com or call the number on the site. We’ll tell you what’s going on and what it’ll cost before any work starts.