Find a puddle under the refrigerator and it’s almost always one of three culprits: the drain pan overflowed, the defrost drain plugged up, or a water line started leaking. Two of those can wait a day. One can’t. Here’s how to tell them apart.
The drain pan: common, rarely a crisis
Every fridge has a drain pan sitting in the base behind the front kick plate. It catches the water that drips off the evaporator coils during each defrost cycle, and normally that water just evaporates, helped along by heat off the compressor and airflow from the condenser fan.
When it overflows, it’s usually one of two things: the pan is cracked, or something changed and more water is collecting than the pan can shed. Bay Area humidity is a real factor, worst from late spring through summer. Slide the fridge to clean behind it and water can slosh out too.
This one you can check yourself. Pull the kick plate off the bottom front, grab a flashlight, and look at the pan, a shallow plastic tray in the base. Full or cracked and that’s likely your answer. A cracked pan needs replacing, and it’s worth having a tech do the swap so the drain tube seating and tray fit get confirmed before it’s all buttoned back up.
Clogged defrost drain
This one turns up constantly on fridges a few years old, Samsung and LG French-door models especially. The defrost system melts frost off the evaporator on a timer, and that meltwater is supposed to run down a drain tube into the pan below. Plug the tube and the water backs up, pools in the freezer, and eventually runs out onto the floor.
What a clogged defrost drain looks like:
- Water on the floor at or in front of the fridge
- Ice building up on the freezer floor
- Water pooling in the fresh-food section
The tube blocks with food debris, ice, or slime. Clearing it means pulling the fridge out, taking off an interior freezer panel, and flushing the tube. But here’s the part people miss: if it keeps re-clogging, there’s a reason. A bad defrost heater, thermostat, or sensor makes the tube refreeze over and over. Clear the drain in that case and you’ve treated the symptom, not the cause. We flush the drain and test the defrost components on the same visit, so you don’t call us back for the same puddle a couple weeks later.
Water line leak: this is the urgent one
If your fridge has an ice maker or water dispenser, there’s a supply line feeding it, usually a thin plastic or braided-steel line running to a shutoff valve behind the unit. These crack, kink, or pull loose at a fitting.
This is the one to move on now. Even a slow drip chews up flooring and subfloor over time. Pull the fridge from the wall and look at the line and its connections. See active dripping or a wet fitting? Shut the supply valve, stop using the ice maker and dispenser, and get us out. Line swaps look simple, but brittle old plastic, corroded fittings, or a connection inside a wall can turn a five-minute job into a real one. Better to find that out before the floor warps, not after.
How we run it down
When we take a water-under-the-fridge call, the first move is to pull the unit and check the supply line. That clears the urgent cause in about a minute. Then it’s the drain pan, a look for ice on the freezer floor, and a short defrost cycle watched to see how water moves through the tube. Most of these are clear within the first few minutes on site.
Clogged defrost drain? We clear it and test the heater and thermostat to confirm the cycle’s actually running. A plain clog is quick. A failed defrost part takes longer but is still a standard fix.
When to call
If you’ve looked at the pan and the water keeps coming back, or there’s a steady drip off the supply line, don’t sit on it. Same if there’s already water under the flooring or dripping you can’t locate.
Bay Area Appliance Repair Service covers the East Bay, Tri-Valley, Peninsula, and South Bay, and water calls jump the line because of the damage risk. The visit is a $75 diagnostic, credited to the repair. We’ll tell you what’s going on and, once we’ve found it, give you a written repair-or-replace call and price. Schedule a visit or call the number on the site.