Sub-Zero Sunnyvale Service Co.
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Total loss of cold

Sub-Zero not cooling in Sunnyvale

If your Sub-Zero has stopped cooling entirely, a few checks can save the diagnosis — and your food. Here is what to do now and the likely causes, from control and airflow to the sealed system.

1,071 reviews · 4.9 / 5
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$89 service call, waived when you book the repair · 365-day warranty on all labor

Refrigeration gauges connected to a built-in Sub-Zero while diagnosing a no-cooling fault in a Sunnyvale kitchen

Quick answer

A Sub-Zero that is not cooling usually comes down to power/control, airflow and defrost, a dirty condenser, or the sealed system. Start by confirming power and that nothing blocks airflow, then move perishables if it is drifting warm. We provide same-day and next-day diagnosis in Sunnyvale, fix it with genuine OEM parts, and waive the $89 visit when you book the repair. Call (669) 338-4601.

Straight answers

Quick answers

My Sub-Zero is warm — what do I do first?

Confirm it has power, check the door is sealing and vents are clear, then move perishables and book a priority visit if it stays warm.

Can you come today?

We hold same-day and next-day windows for Sunnyvale. Call early in the day for the best same-day slot.

Is no cooling always the compressor?

No. It is often a control, fan, defrost or condenser issue. Sealed-system faults are confirmed with pressure and electrical evidence.

Cost to diagnose?

An $89 service call, waived when you book the repair.

Likely causes when a Sub-Zero stops cooling

No-cooling causes → typical action
CauseWhat you might noticeTypical action
Power / controlDark display, no fansCheck power, test control board
Evaporator fanFreezer cold, fridge warm, quietTest and replace fan
Defrost circuitIce buildup then warmingTest heater, sensor, drain
Dirty condenserRunning hot and constantlyClean condenser, recheck temps
Sealed systemRunning but no cold at allPressure & electrical diagnosis

A unit that runs constantly but never gets cold often points to the sealed system — confirmed with evidence.

On dual-refrigeration models, a warm fridge with a cold freezer is usually airflow or defrost — see warm fridge & split temperature. A total loss of cold across both is more likely control or sealed system — see sealed system & compressor.

No-cooling diagnosis pricing

Draft ranges by outcome
OutcomeDraft rangeTime
Diagnostic / service visit$8945–90 min
Fan / defrost / sensor$280–$7001–3 h
Control board$350–$1,2501–4 h
Compressor / sealed system$1,450–$3,6002–6 h + parts

Draft ranges for planning only; final quote depends on the confirmed cause.

What to do right now if your Sub-Zero is warm

Safe checks before the technician arrives — they protect your food and often speed the diagnosis.

  1. 1
    Confirm power

    Check the unit has power and the breaker has not tripped. A dark display or silent fans points to power or control.

  2. 2
    Protect perishables

    If the box is above ~40°F, move perishables to a cooler or another fridge now.

  3. 3
    Check the door and vents

    Make sure the door is sealing fully and interior vents are not blocked by food.

  4. 4
    Feel the condenser area

    If the grille area is hot and the unit runs nonstop, a dirty condenser may be a factor — note it for the technician.

  5. 5
    Note any codes

    Write down any error code or alarm. Power-cycle once; if it stays warm, book a priority visit.

Related Sub-Zero help in Sunnyvale

Warm fridge & split temperature If only one side is warm Sealed system & compressor Runs but never cools EC 50 error code If a cooling code shows Water on the floor If a leak comes with warming Emergency repair Fastest available windows
Reviews

What Sunnyvale homeowners say

1,071 reviews · 4.9 / 5

Verified Sub-Zero repairs across Sunnyvale

No cooling
Woke up to a warm Sub-Zero. They came same-day, found a failed evaporator fan — not the compressor — and had us cold by afternoon with a genuine part. The $89 came off the repair.
Brian K. Lakewood Village, Sunnyvale
Control board
Whole unit went dead. They diagnosed the control board, proved it electrically, and used a genuine Sub-Zero part. Honest about cost and backed it with the 365-day labor warranty.
Natalie R. Cherry Chase, Sunnyvale
Sealed system
Ran constantly but never cooled. They put gauges on it and confirmed a sealed-system fault with evidence rather than guessing. Clear quote and careful work. Highly recommend.
Felix M. Birdland, Sunnyvale
Answers

Frequently asked questions

Why did my Sub-Zero stop cooling?

Most no-cooling calls trace to one of five causes: a power or control-board fault, a failed evaporator fan, a stuck defrost circuit, a clogged condenser, or the sealed system. We run factory-spec diagnostics to confirm the exact cause before quoting, so you pay for the real fix and not a guess. See sealed system & compressor if it runs but never gets cold.

Should I unplug my Sub-Zero if it is not cooling?

Only unplug it if you smell something burning or see scorching near the outlet, then call us. In every other case, leave the unit powered, move perishables to a cooler, and book a diagnosis. Cutting power can erase active error codes and a constantly running compressor often gives us the clearest evidence of a sealed-system or control fault when we arrive.

Can you come same-day in Sunnyvale for a warm Sub-Zero?

Yes. We hold same-day and next-day windows for Sunnyvale plus Mountain View, Cupertino, Santa Clara, and Los Altos. Call (669) 338-4601 early in the day for the best shot at a same-day slot. A total loss of cold is treated as a priority, since food and the compressor are both at risk the longer it runs warm.

How much will a no-cooling repair cost?

It depends on the confirmed cause. A fan, sensor, or defrost part typically runs a few hundred dollars; a control board or sealed-system repair costs more. The $89 service call is waived when you book the repair, all labor carries a 365-day warranty, and we install genuine OEM parts. See repair pricing for planning ranges by outcome.

Is the food in my Sub-Zero still safe?

If the interior has sat above about 40 degrees Fahrenheit for more than two hours, treat perishables like meat, dairy, and leftovers as at risk and relocate them to a cooler or another fridge. Frozen items often hold longer if the door stays shut. When in doubt, throw it out; protecting your food is the first thing we tell customers to do while they wait.

Does no cooling always mean a sealed-system or compressor problem?

No. While a unit that runs nonstop yet never gets cold can point to the sealed system, the cause is just as often a failed evaporator fan, a defrost issue, a dirty condenser, or a control board. We confirm sealed-system faults only with pressure readings and electrical evidence, never assumptions, so an expensive compressor repair is quoted only when the data clearly supports it.

Are you affiliated with Sub-Zero?

No. We are an independent Sub-Zero repair company serving Sunnyvale and nearby cities; we are not affiliated with or endorsed by the manufacturer. That said, we use factory-spec diagnostics, follow manufacturer-recommended procedures, install genuine OEM Sub-Zero parts, and back every repair with a 365-day labor warranty. Our work is rated 4.9 across 1071 reviews.

1,071 reviews · 4.9 / 5

Sub-Zero warm and not cooling in Sunnyvale? Get a same-day diagnosis.

Same-day and next-day visits across Sunnyvale. $89 service call, waived when you book the repair, and every repair carries our 365-day warranty on all labor.

(669) 338-4601 Book online
Call (669) 338-4601 Book online