Frost line gone after gasket job
There was a frost line down one side of the freezer and the door felt loose. New OEM gasket, squared the door, and showed me how to keep the seal clean. Fair price and on time. Will call them for anything built-in.
Symptom guide
Sub-Zero Freezer Not Freezing in Concord
When the freezer side gives up but the refrigerator still holds cold, the cooling itself is usually working — the cold just is not getting made or moved inside the freezer compartment. On the freezer columns and under-counter drawers common in Concord built-in kitchens, that points to the defrost system, a sensor, or the evaporator fan far more often than the compressor. We diagnose the real cause first, with the $89 service call waived when you book the repair.
A Sub-Zero freezer that will not freeze while the fridge stays cold is usually a defrost fault icing the evaporator, a temperature sensor reading wrong, or a stalled evaporator fan that cannot circulate the cold it makes — not a dead compressor. On a freezer column or a freezer drawer the symptom and the parts differ from a side-by-side, so we identify the platform and read the frost pattern before quoting anything.
Straight answers
Freezer-not-freezing questions, answered fast
The short version before the detail below.
My freezer is warm but the fridge is cold — what is it?
On most Sub-Zero built-ins each side has its own evaporator, so a warm freezer with a cold fridge isolates the fault to the freezer’s defrost system, sensor or fan. It is rarely the sealed system, and rarely the compressor.
Why is there frost building on the back wall?
A solid frost sheet on the freezer’s rear panel usually means the defrost heater or its sensor has failed, so frost never clears and eventually blocks airflow. Clearing it without fixing the defrost cycle only buys a few days.
Is it the compressor?
Almost never on its own when the fridge side is still cold. A failed compressor or sealed system typically warms both compartments, so a split — cold fridge, warm freezer — points inside the freezer, not at the sealed loop.
Triage table
Match the freezer symptom to the likely cause
A starting point only — the on-site diagnosis confirms which it is before any part is quoted.
| Symptom | Likely cause | What to do |
|---|---|---|
| Freezer warm, fridge fine | Defrost heater or sensor, or a stalled evaporator fan on the freezer side | Listen for the freezer fan; if frost is building, book a defrost diagnosis |
| Solid frost sheet on the back wall | Failed defrost heater or defrost thermostat letting frost accumulate | Do not chip it; a defrost repair clears and prevents the rebuild |
| Freezer drawer soft, never reaches set point | Drawer gasket leaking, slow fan, or a sensor reading high | Check the drawer seal and rails; book if it still will not pull down |
| Both freezer and fridge slowly warming | Condenser heat-load or sealed system — not a defrost-only fault | Check the condenser; this is the both-sides-warm path, a different page |
| Ice cream soft but ice cubes still form | Marginal airflow or a sensor a few degrees off, early defrost wear | Note the temperatures and book before it slides into a full no-freeze |
Move anything thawing to another freezer and book promptly — a freezer that drifts above 10°F is past the point of holding food safely.
Why it happens here
Freezer columns, drawers, and Concord’s split-day humidity
Concord’s newer built-in kitchens — the remodels around Ygnacio Valley, Crystyl Ranch and the east side — lean heavily on dedicated freezer columns and under-counter freezer drawers rather than a single over-under box. That matters, because each of those units runs its own evaporator and defrost cycle, so a freezer that quits while the kitchen refrigerator next to it stays cold is almost always an isolated freezer-side fault: a defrost heater that no longer melts the frost, a defrost sensor reading wrong, or an evaporator fan that has stopped moving cold air over the coil.
The defrost story has a local twist. Concord mornings often arrive with cool, humid Delta air drawn in overnight, then the afternoon turns hot and dry in the lee of Mount Diablo. Every time a freezer drawer or column door opens across that swing, humid air rolls in and freezes on the coil. A healthy defrost cycle melts it away on schedule; a failing heater or thermostat lets it stack up into the back-wall frost sheet we see most often, which then blocks the very airflow that keeps the compartment cold.
Freezer drawers add their own wrinkle. The wide gasket on a pull-out drawer takes more abuse than a hinged door — bags catch in it, rails wear, and a drawer that no longer seals flat lets a steady trickle of room air defeat the cold. We check the seal, the rails and the fan before assuming anything deeper. If both compartments are drifting warm together, that is a different problem; our warm-fridge guide covers the both-sides path and the condenser heat-load behind it.
Before you call
Three safe checks you can do first
None of these void anything or risk damage, and they sometimes narrow the fault before we arrive.
- 1
Listen for the freezer’s evaporator fan
With the freezer open, you should hear a soft fan moving air. If it is silent while the compartment is warm, a stalled freezer fan or its control is a strong suspect, and that is what we will test first.
- 2
Look at the frost pattern on the back wall
A light, even frost is normal. A thick solid sheet across the rear panel points to a defrost heater or thermostat that is not clearing frost — note it so we bring the defrost parts for your model.
- 3
Check the drawer or door seal
On a freezer drawer, make sure nothing is caught in the gasket and the drawer pulls fully shut on its rails. On a column, run a hand around the seal for cold leaks. A drawer that will not seal flat is a common, inexpensive cause.
Avoid these
What not to do with a freezer that won’t freeze
- Don’t chip or pry the back-wall frost off with a tool — the evaporator and defrost heater sit just behind it, and a puncture turns a defrost repair into a sealed-system job.
- Don’t crank the freezer to its coldest setting to compensate; if airflow is blocked by frost it changes nothing and overworks the system.
- Don’t keep refreezing thawed food across cycles; move perishables to another freezer rather than risk food safety while you wait for the visit.
- Don’t leave a leaking drawer gasket unaddressed — the constant humid-air intake both warms the freezer and accelerates the next frost build-up.
Typical cost
What the common freezer repairs run in Concord
Draft ranges for planning; the $89 diagnostic is waived when you book the repair.
| Service in Concord | Draft range | Time | Note |
|---|---|---|---|
| Diagnostic / service call | $150–$230 | 45–90 min | Temps, frost pattern, fan and defrost checks |
| Defrost heater / thermostat / sensor | $300–$750 | 1–3 h | Clears frost build-up and restores the cycle |
| Evaporator fan motor | $250–$650 | 1–2 h | Restores cold-air circulation on the freezer side |
| Freezer drawer gasket / alignment | $300–$700 | 1–2 h | Stops humid-air intake on pull-out drawers |
| Control board | $350–$1,250 | 1–4 h | Only after electrical proof a defrost-control board failed |
Draft ranges for planning; final quote depends on model, parts, access, and on-site diagnosis.
Keep exploring
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Reviews
Freezers brought back to temperature
Concord homeowners on the defrost, fan and sensor fixes that restored the freezer side.
Actually covered my area
A lot of "Bay Area" companies hedge on Martinez. They gave me a realistic arrival window for the route and showed up inside it. Quick freezer fix, clear about the labor warranty. Easy to recommend.
Same trusted crew next town over
We’re just over the Concord line and they treat Pleasant Hill like home turf. Realistic window, clear $89-waived policy, and they fixed our freezer drawer the first visit. Bookmarked.
FAQ
Frequently asked questions
Why is my Sub-Zero freezer not freezing but the fridge is still cold?
On most Sub-Zero built-ins the freezer and refrigerator each have their own evaporator, so a warm freezer with a cold fridge isolates the fault to the freezer side. The usual causes are a defrost heater or thermostat that no longer clears frost, a sensor reading wrong, or a stalled evaporator fan that cannot circulate the cold. We confirm with temperature and frost-pattern checks before quoting.
There is a thick sheet of frost on the back wall — is that the problem?
It is usually the visible result of a defrost fault. When the defrost heater or thermostat fails, frost that should melt away on schedule keeps building until it blocks the airflow that keeps the freezer cold. Chipping it off only helps for a few days; the lasting fix is repairing the defrost cycle so frost clears the way it should.
Could my freezer drawer just have a bad seal?
Often, yes. Pull-out freezer drawers take more gasket wear than hinged doors — bags catch in the seal and rails wear, so the drawer no longer closes flat. A steady trickle of humid room air then defeats the cold and feeds frost build-up. A gasket and alignment job is one of the more affordable freezer fixes, and we check the seal and rails before anything deeper.
How much does a freezer repair cost in Concord?
A defrost heater, thermostat or sensor repair typically runs $300–$750, an evaporator fan motor $250–$650, and a freezer drawer gasket and alignment $300–$700. The $89 diagnostic is waived when you book the repair, and a control board is only quoted after electrical testing proves it failed. Every repair carries a 365-day labor warranty with genuine OEM Sub-Zero parts.
Is the food in my freezer still safe?
Once a freezer drifts above about 10°F it is no longer holding food reliably, and anything that has partially thawed should not be refrozen. Move what you can to another freezer and book promptly. Tell us how warm it has gotten when you call so we can prioritize a no-freeze that is putting food at risk.
How fast can you reach my Concord home?
Most Concord-area freezer calls are scheduled within a couple of business days, with a realistic arrival window. Tell us the model and whether you are dealing with a freezer column, a drawer or an over-under unit when you call (650) 695-6963, so we arrive with the likely defrost parts, fan or gasket and finish in one visit where possible.
Book your repair
Get the freezer holding cold again
Tell us what your Sub-Zero freezer is doing and we’ll find the real cause — defrost, fan or seal first. $89 service call, waived when you book the repair, 365-day labor warranty.