Common fault
Why does frost keep building up in my freezer?
Short answer
Frost that comes back after you clear it means the defrost cycle is not completing.
The reasoning behind that
Three things account for nearly all of it: a defrost heater that has failed, a thermistor reading out of range so the cycle never triggers properly, and a door gasket that has lost its magnetic pull and is admitting humid air faster than the cycle can remove it. In Carlsbad the gasket version is more common than it would be inland, because the air coming in on a coastal morning carries far more moisture for the defrost system to deal with.
How the diagnosis goes
What we check, in order: the actual compartment temperature at the shelf against 0°F; where the frost is forming, since frost on the rear wall and frost around the door frame mean different faults; the defrost heater's continuity; the thermistor's resistance against spec; and the gasket, tested warm and along the hinge side, where it takes its set first.
Clearing the frost by hand treats the symptom and removes the evidence, which is the main reason this fault gets diagnosed late. Once the evaporator is furred over it insulates itself, so cooling degrades gradually rather than stopping, and owners describe the unit as slowly getting worse rather than breaking. On the coastal side of the city that decline runs quicker, because every door opening on a humid morning adds moisture the cycle then has to shed.
If that matches what yours is doing, say so when you call — it decides which parts come on the van.
Reviews
Two other companies had been out and both said gasket. He looked at how the column was standing before he touched the rubber. Our kitchen is an old Olde Carlsbad remodel and the thing had been wedged into an opening built for something else. Sat it level, door pulls flat now.
- ★★★★★
The Viking drawers out by the grill had stopped getting properly cold. Condenser was caked from the sea air out on that patio. He cleaned it, checked the seal, told me what to watch for. Short visit, straight answer, no push to replace anything.
- ★★★★★
The Wolf oven had been running cool for ages and I had just been adding ten minutes to everything without thinking about it. He put a probe in the cavity, showed me how far the sensor had drifted, replaced it and checked the door hinges too.
Appliance down in Carlsbad?
Tell us the brand and what it is doing — we can usually name the likely repair before we arrive.
Questions
Frequently asked questions
The kitchen is from an older Carlsbad remodel. Is a twenty-year-old built-in worth repairing?
Usually yes. A built-in is a fitted part of the kitchen, so replacing one means matching an opening, a panel front and a trim line that may not have been made for years, which turns a repair into a cabinetry job. We replace fans, defrost heaters, thermistors, gaskets and ice maker modules, and older units are easier to keep running than the newest control-board columns.
My wine column says it is at the set point but the bottles feel warm. Which do I believe?
The bottles. The sensor reads a spot the circulating air reaches, so the panel holds its set point while the racks sit several degrees above. It is our most common call from the La Costa estates and the golf-course blocks: lights on, door cold, nothing beeps. On a dual-zone column, a zone that drifts while the other holds is that zone's evaporator, fan or damper.