Common fault
Why does frost keep building up in my freezer?
Short answer
Chipping the same back panel twice means the defrost circuit, not the cooling: a failed heater, a drifted thermistor, or a drain iced closed so melt refreezes on the coil. Say so when you call Poway Sub-Zero Repair Experts on (858) 630-4145.
Why we start there
A Poway garage freezer adds two suspects — a gasket gone rigid in dry heat, and a drain that refreezes overnight.
What happens next
The ice itself is what does the damage, which is why this fault gets described as the freezer gradually getting worse rather than breaking. A coil furred with frost is insulated by that frost, heat transfer drops, the compartment runs a degree warmer each week, and the display carries on reporting the number it was asked to hold. By the time drawers are frozen into their runners or a chest lid has iced to its seal, the coil has been struggling for months and the contents have been through temperature cycles they should never have seen. Soft ice cream in a freezer that still looks frozen is the earliest honest warning you get.
Look before you scrape, because taking the ice off by hand throws away the evidence that would have named the part. A thin even fur over the entire back panel is ordinary moisture. A dense slab over one area, or ice creeping around the fan cover, is the circuit. Ice standing across the floor of the compartment with water turning up underneath the unit is the drain. A rim following the line of the door or the lid seal is the gasket. On a garage unit, test that seal after dark instead of in the afternoon, because material that has gone rigid will often still make contact while it is warm and let go once it has cooled, which is precisely why these faults get reported as coming and going.
If that matches what yours is doing, say so when you call — it decides which parts come on the van.
Appliance down in Poway?
Tell us the brand and what it is doing — we can usually name the likely repair before we arrive.
Questions
Answers before you call
What actually happens on the visit, and when do I hear a number?
Airflow and the condenser first, including whether a soffit or a later cabinet run closed off the heat path in an older Poway kitchen. Then evaporator fan draw, coil, defrost heater continuity, thermistor resistance against the published figures, gasket pull, cabinet temperature by probe. The number for parts and labor comes last. Poway Sub-Zero Repair Experts takes those calls on (858) 630-4145.
What parts do you fit, and will mine be on the van?
The manufacturer’s own parts where the model still has them, and we say so when something has to be a pattern equivalent. Generic fans and thermistors usually run, then reappear within a season. Whether yours is on the van depends on the model number you read out. That is a two-minute call to Poway Sub-Zero Repair Experts on (858) 630-4145.