The complaint: no ice from a Sub-Zero that was otherwise fine
The unit is a Sub-Zero 700BFI — the 700 series integrated bottom-freezer drawers that hide behind custom wood panels — and this one was built in July 2005. Twenty-one years old, still running, and by every account working fine except for one thing: the ice maker had gone quiet. On the phone that sounds like an ice-maker problem, and plenty of companies would quote an ice maker from the phone. We don’t quote parts over the phone. This call is why.
What we found under the ice maker
On this series the ice maker sits directly above the freezer evaporator — the coil that makes the cold. When the drawer came out, the evaporator wasn’t a coil any more. It was a solid block of frost and ice, fins buried, tubes encased. Air can’t pass through a coil like that, so the freezer runs and runs without getting properly cold, and an ice maker that never sees the temperature it needs to cycle simply stops. The ice maker was fine. It was being starved.
Why a freezer turns its own coil into an ice block
Every frost-free freezer melts the frost off its evaporator several times a day with a defrost heater. On a Sub-Zero 700 series that heater is governed by a small bimetal thermostat clipped to the coil — Sub-Zero calls it the defrost terminator. When the terminator fails, the defrost cycle no longer works as designed, the frost never fully clears, and every cooling cycle adds another layer. Over weeks, the coil disappears. The heater itself wasn’t the failure here; the $89 terminator was. Sub-Zero’s own guidance treats frost buildup in the freezer as a service call rather than a user fix, for exactly this reason.
The fix: steam, not a chisel
We never chip ice off an evaporator — one slip through a tube and an $89 job becomes a sealed-system repair. The coil was steamed clear, the defrost terminator replaced with Sub-Zero’s service part, the defrost heater and evaporator fan checked, and the drawer and panels went back on. On site 1 hour 33 minutes, the same day the call came in.
The bill — and the repair we didn’t sell
$318 total: $220 for the manual defrost and installation, $89 for the defrost terminator, with the $85 diagnostic credited toward the work. An ice maker would have cost more and fixed nothing, because the ice maker wasn’t the problem. A comparable new Sub-Zero integrated freezer is many thousands of dollars before the custom panels and installation. A 2005 unit with a healthy sealed system had no business being replaced over a thermostat.
If your Sub-Zero ice maker stops
Before anyone quotes you an ice maker, ask two questions: is the freezer actually holding zero degrees, and what does the evaporator look like? On a 700 series the honest diagnosis takes pulling the drawer, not reading a symptom. Frost building on the back wall or under the drawer, a freezer that seems “cold but not cold enough,” cubes that came out small before production stopped entirely — those point at the defrost system, not the ice maker. Our earlier guide covers the other reasons a Sub-Zero ice maker quits.
We repair Sub-Zero built-ins and integrated units in Beverly Hills, West Hollywood, Bel Air and across Los Angeles, 7 days a week — see Sub-Zero refrigerator repair and real prices from 3,600+ repairs. And if the coil itself is the problem rather than the frost on it, here is what a Sub-Zero sealed-system repair looks like.