Doctors Lake Refrigeration — independent Sub-Zero built-in refrigeration repair in Orange Park, FL 32073 (Clay County). Call (904) 442-8210. # Frost, water and defrost faults in Sub-Zero built-ins Frost on the freezer walls, water under the crisper, ice in the bin. Where the water collects names the failed component before anything is disassembled. Source: https://subzerorepairorangepark.com/service/frost-and-defrost-faults/ --- **Symptoms this page covers:** A sheet of frost on the freezer back wall that returns after you clear it; Water pooling under the crisper drawers or along the bottom of the cabinet; A solid slab of ice in the ice bin instead of loose cubes; Ice forming under the freezer drawer or around the drawer runners; Food at the back of the freezer frosted over while the front is fine; A puddle appearing on the kitchen floor in front of the unit. **What gets checked, in order:** Identify where the water is collecting, because the location names the failed component; Check whether the evaporator is iced over and how evenly the frost has formed; Trace the drain line for a blockage or an ice plug at the outlet; Test the defrost heater and the termination sensor rather than swapping both; Check the drain heater or drain path on models that have one; Inspect gaskets and door closure, since humid air is what supplies the frost. Frost is a symptom with a short list of causes, and in a Florida house the raw material is never in short supply. Every time a door opens, humid air enters the cabinet, condenses on the coldest surface it can find, and freezes there. A working refrigerator melts that frost off on a schedule and drains the water away. When either half of that arrangement fails, the frost accumulates and the water stays. ## Where the water sits tells you what failed We ask people to look before they call, because the location is most of the diagnosis. **Frost on the freezer back wall, returning after you clear it.** The evaporator is not being defrosted properly. Either the heater is not producing heat, or the sensor that terminates the cycle is calling it done too early, or the control is not initiating the cycle at all. These read very differently on a meter and there is no reason to guess between them. **Water under the crisper drawers.** The fresh-food drain is blocked. Melt water that should run down the back wall and out is backing up into the bottom of the compartment instead. Nine times out of ten this is debris in the drain, not a failed part. **Ice under the freezer drawer or around the runners.** The freezer drain has plugged, usually with an ice plug at its outlet. Clearing it is straightforward. Working out why it plugged — a drain heater that is not working, a drain tube that has shifted, a cycle that is running long — is the part that keeps it from coming back in four months. **A slab in the ice bin.** This one gets misattributed constantly. Loose cubes become a slab when the bin warms up between harvests and the surfaces melt and refreeze into each other. The ice maker is doing its job. Something else is letting the bin warm — a defrost cycle running too long, a drawer or door not sealing, or a compartment that is drifting. **A puddle on the floor.** Water has found its way past the evaporation pan or is overflowing it. Worth attending to quickly in a house with hardwood or engineered floors, which is most of Orange Park. ## Why the drain plugged, which is the part that matters Clearing a blocked drain is quick. Working out why it blocked is what stops the same call coming back in four months, and there are only a handful of honest answers. Ordinary organic debris — food particles, crumbs and the film that builds in any drain path — narrows the tube until melt water no longer clears it between cycles. Once it is slow, the standing water freezes at the coldest point, usually right at the outlet, and now the blockage is ice rather than debris. On models fitted with a drain heater, a heater that has failed produces exactly that ice plug on a perfectly clean tube, and clearing the tube without testing the heater guarantees a return visit. A drain tube that has shifted out of position, or a grommet that has come adrift, dumps water where it should not be while the drain itself is clear. Each of those has a different fix and they are not distinguishable by looking at the puddle. That is why the drain gets traced along its length and the heater and termination sensor get read on a meter rather than replaced on suspicion. ## Humidity is the other half of the story Northeast Florida gives a cabinet a great deal of moisture to work with for most of the year, and a built-in installed against an exterior wall or in an open-plan kitchen that vents to a screened porch sees more of it than the design assumes. A gasket that has taken a permanent set, a door held a millimetre open by a overloaded shelf, or a custom overlay panel that has dropped on its hinge all allow a continuous trickle of humid air in. The defrost system then spends its life fighting a load it should never have had. That is why we check doors on every frost call, even when the frost is clearly an electrical fault. Fixing a heater in a cabinet that is still inhaling wet air just means the next failure arrives sooner. ## The visit Flat diagnostic fee, credited toward the repair. Written estimate before anything is ordered. If the evaporator is fully iced, part of the visit is thaw time, and we will tell you honestly whether that is best done while we wait or on a return trip. --- **Contact.** Doctors Lake Refrigeration, Orange Park, FL 32073. Phone (904) 442-8210. Monday – Friday 08:00–18:00; Saturday 09:00–16:00. Closed Sunday. Calls placed after hours are returned the next working morning. The phone is the only channel — this site publishes no contact form and no email intake. **Affiliation.** Doctors Lake Refrigeration is an independent appliance repair company. We are not affiliated with, authorized by, or endorsed by Sub-Zero or its parent company. All brand names and model numbers are the property of their respective owners and are used only to identify the appliances we service.