Water Under Your Commercial Refrigerator: Where It Comes From
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Updated October 14, 2026
Quick answer
Water under a reach-in almost always comes from defrost water that is not reaching the condensate pan: a clogged or frozen drain line, a cracked pan, or a pan heater that has failed and lets the pan overflow. Unit not level is the other common cause. A wet floor in a kitchen is also a slip hazard, so fix it the same day.
Where defrost water should go
Each defrost cycle melts frost off the evaporator. The water runs down a drain tube to a pan near the compressor, where a heater or the hot discharge line evaporates it. Any break in that path ends up on your floor.
Checks you can do
- Check the unit is level front to back. Many units are designed to tilt slightly so water runs to the drain.
- Look at the condensate pan. Is it full, cracked, or sitting off its bracket?
- Look inside at the bottom of the evaporator cover. A sheet of ice there means the drain froze.
- Check door gaskets. Humid air leaking in makes more frost, and more water.
Causes a technician fixes
- Frozen drain line from a failed drain heater (freezers)
- Evaporator icing from a defrost fault
- Failed condensate pan heater or evaporator element
- Cracked drain tube inside the cabinet wall
Related: refrigeration water leaks.
Find the source first
| Where the water is | Where it likely comes from |
|---|---|
| Under the front of the unit | Condensate pan overflow or door gasket sweat running down |
| Inside the cabinet floor | Drain blocked or frozen; defrost water has nowhere to go |
| Behind the unit | Drain tube cracked or pulled off the pan |
| Outside on the doors and frame | Condensation from humid air: door heater failed or gasket leaking |
| Under a prep table rail | Rail drain clogged with food debris |
Prep tables and food debris
Prep table rails drain into the same system as the cabinet on many models, and crumbs, cheese and lettuce block the drain opening. Clean the rail drain when you clean the pans. A clogged rail drain overflows into the cabinet, then onto the floor.
Why it gets worse in summer
Humid air carries more moisture. Every door opening brings it in, and it ends up as frost, then defrost water. A condensate pan sized for normal conditions can overflow when the pan heater is weak and the air is humid. If leaks appear only in hot, humid weeks, the pan heater or the gaskets are the first suspects.
Ice under a freezer
On reach-in freezers, a drain heater keeps the drain line from freezing during defrost. When it fails, water refreezes in the drain and then in the cabinet bottom, often as a sheet of ice under the evaporator cover. Do not chip at it; switch to a manual defrost and call. The heater needs replacing or the problem returns within days.
What the technician does
- Clears and flushes the drain line and checks its slope
- Tests the condensate pan heater or hot-gas pan loop
- Tests the drain heater on freezers
- Checks defrost operation and termination
- Inspects gaskets and the door frame heater if the unit has one
- Levels the unit so water runs toward the drain
Slip and food-safety risks
A wet floor next to a cook line is a slip hazard for staff, and standing water under equipment draws pests and fails health inspections. Put down a wet-floor sign and a drip pan until the cause is fixed. If water is coming from an iced evaporator, the cabinet will warm soon; watch the temperature.
Related problems
Owner checks in order
- Wipe up and put down a drip pan so you can see where new water appears.
- Check level with a phone level app on the top front edge and side edge.
- Pull the bottom grille and look at the condensate pan: water level, cracks, position.
- Look inside for ice under the evaporator cover or water pooled on the cabinet floor.
- Run your hand along the door frame and gaskets for sweating.
- On a prep table, clear the rail drain opening.
Bay Area factors
Coastal and Bayside humidity in San Francisco, the Peninsula and Alameda adds moisture with every door opening, so condensate pans work harder than in drier inland kitchens. Older buildings often have floors that are not level, so units drift out of level after cleaning or moving. Re-level after every deep clean.
What not to do
- Do not chip ice from the evaporator or drain; you can puncture tubing.
- Do not unplug and plug repeatedly; the compressor needs time between starts.
- Do not seal the drain shut to stop the leak; water will back up into the cabinet.
When to call a technician
Call if the drain is frozen, the evaporator is iced, or the pan keeps overflowing after you level the unit.
Open 7 days, 8 AM to 5 PM, with emergency service until 9 PM. CA Lic. #776244.
Frequently asked questions
Why is my reach-in leaking water on the floor?
The most common causes are a blocked or frozen drain line, an overflowing condensate pan, or a unit that is not level.
Is water under a commercial fridge dangerous?
It is a slip hazard and, if it comes from an iced evaporator, a sign the unit will soon stop cooling.
Can I clear the drain myself?
You can flush an accessible drain with warm water. Do not chip ice off the evaporator; that damages the coil.
Why does my reach-in only leak in summer?
Humid air brings in more moisture, and a weak condensate pan heater cannot evaporate the extra defrost water.
Can a dirty condenser cause leaks?
Indirectly; a hot, struggling unit runs longer, frosts more and produces more defrost water.
Should water drain inside the cabinet?
Yes, into the drain opening under the evaporator; it should never pool on the cabinet floor.
Related guides
Sources
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