Common fault
Why does frost keep building up in my freezer?
Short answer
If you scrape the frost out and it is back within a couple of weeks, the defrost cycle is starting and never completing. Three parts account for nearly all of it: a defrost heater that has burned open, a thermistor that has drifted far enough out of range that the control no longer triggers the cycle correctly, or a door gasket whose magnet has weakened, letting more moisture into the cabinet each day than the cycle can carry back out. The reason to deal with it early is that ice on the evaporator acts as insulation, so the unit does not fail, it fades. Cooling gets a little worse each week and the number on the display stops matching the temperature around the food.
Coastal San Diego brings this fault out earlier than a dry climate would. Along the water in Point Loma, Coronado, Pacific Beach, Del Mar and Encinitas the marine layer keeps indoor humidity high for most of the year, and every door opening loads the evaporator with more moisture than the identical freezer would see in Escondido or Rancho Bernardo. A defrost circuit that is only marginally weak survives inland and gives itself away on the coast. It is also why gasket condition matters more here than the price of a gasket suggests.
There is a test you can run yourself in ten seconds. Close the freezer door on a strip of paper and pull it out. If it slides free with no drag, the seal is not making contact at that point, and the worst spot is usually on the hinge side or at a lower corner where the gasket has taken a set. On built-ins carrying a heavy custom panel the door hardware can also drift out of adjustment, which loads one corner of the seal and unloads the opposite one.
What we check on the visit: the heater for continuity and current draw, the thermistor against a resistance table at a known temperature rather than by feel, the drain path below the coil, and whether the coil is frosted uniformly or frosted in one region. That last one matters. Uniform frost with a dead heater is the ordinary repair. Frost concentrated at one end of the coil is a different story and can point at the sealed system, which is worth establishing before any parts are ordered rather than after.
If the freezer sits in a second home that is closed up for weeks at a time, add one more cause. The cabinet is sealed with whatever humidity was in the room on the day the house was shut, and a full reload of unfrozen food after a long empty stretch runs the defrost cycle hard for days afterward. Frost that appears after a return trip is not the same problem as frost that has been quietly building all year.
If that matches what your appliance is doing, say so when you call — it tells us which parts to bring, and most of these are finished in one visit.
The visit, step by step
Nothing here is unusual — it is simply what a proper diagnosis on built-in equipment looks like, and it is worth knowing so you can tell the difference.
- Symptom first. What it is doing, when it started, and whether anything changed in the kitchen — a new filter, a power cut, a door left ajar.
- Panels off. Grille, kick plate or rear cover, depending on the unit. Readings at the coil and the fan, water pressure at the inlet where the fault involves ice or water.
- Quote. One figure, parts and labour, agreed before work starts.
- Repair and re-test. The unit is brought back up and verified before the van leaves.
What it costs
The call-out and diagnosis is a flat charge, quoted when you book. What that pays for is a technician who tests the component instead of reading the symptom and guessing — which is the difference between one visit and three.
The repair price comes after the diagnosis, as a single figure for parts and labour, and it is agreed by you before the work starts. Factory-approved parts, priced openly. No surcharge for evenings or weekends.
Andrei did a fantastic job repairing my washing machine! He was punctual, polite, and very knowledgeable. He explained the problem in detail and fixed it quickly. I was impressed with his professionalism and the reasonable pricing.
My refrigerator stopped cooling right before the weekend, and I was panicking. Thankfully, Dmitry arrived the same day, diagnosed the issue quickly, and had all the parts needed. He fixed it on the spot.
Bill was on time and very professional. He quickly analyzed and fixed it at minimal costs. He also looked into another potential problem on an appliance for free. I will use his services for all of my appliances.
Appliance down in San Diego?
Tell us the brand and what it is doing — we can usually name the likely repair before we arrive.