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The black compressor at the lower back of a chest freezer with the side cover off, a small start relay plugged onto its side, seen close with nobody in the frame.

Sub-Zero EC40 with Service flashing: the freezer compressor has run far too long

EC40 (40 on IC-27 columns) is logged when the freezer compressor runs excessively.

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Mon–Sat, 8am–8pm

  • Compressor and sealed system
  • Freezer compressor and start relay repair
  • Source: Sub-Zero

Book a visit

Three short steps, about a minute.

or call (844) 456-4651

What EC40
actually means.

EC40 (40 on IC-27 columns) is logged when the freezer compressor runs excessively. Sub-Zero names a door left ajar, a dirty condenser, and fan, sensor or sealed-system trouble as the causes, and asks owners to judge by how far the temperature is above the setting.

Sub-Zero freezer display · also shown as EC 40, 40

What to do when EC40 shows on the freezer

Kind of codeCompressor and sealed system

The compressor did not start, started and cut out, or ran without bringing the cabinet down, which the control reports as a code. A start relay or an overload protector that clicks and gives up is the cheapest answer and is ruled out first; a compressor that will not turn, or refrigerant lost from a leak, is a sealed system job and the point where age decides between repair and a new freezer. Keep the food cold while it is diagnosed.

Usually leads toFreezer compressor and start relay repair

Getting a freezer's compressor running again, from the small start relay and overload that fail most often to the compressor itself when it will not pump.

Shows up asFreezer Error Code

A freezer error code appears on the display: letters and digits, a flashing temperature, or a warning symbol, sometimes with an alarm and sometimes with the freezer still running.

MakeSub-Zero

Sub-Zero freezers repaired in the home, with the food kept shut in while the cause is found.

SourceSub-Zero answer: 600, 648PRO, 700 Series EC40 and Service flashing

600, 648PRO and 700 Series (EC40 with Service flashing) and IC-27 integrated columns (40). Designer models log runtime problems as 40 with a zone digit instead.

Before you book,
in this order.

Each step comes from Sub-Zero's own guidance for EC40 on its freezers. Follow it to the end: the last card says whether this is a visit.

01

Read the freezer temperature on the display: if it is more than 10° above the setting and the door was not left open, keep the door shut and book a visit.

02

If the temperature is less than 10° over the setting, turn the power off and vacuum the condenser behind the grille, then restore power.

03

Once temperatures are back near normal, hold the door ajar alarm key for 15 seconds to clear EC40; do not clear it while the freezer is still warm.

Still there?

It usually turns into freezer compressor and start relay repair. Book with the code and the model number.

What not to do

EC40 is not the refrigerator-side code; excessive fresh food compressor run is EC50. It is also not a sensor code, although a failed sensor is one of the possible causes behind it.

What you may
notice with it.

The freezer problems EC40 tends to arrive with. Answer these at the freezer before anyone is booked.

All problems

Before you call

Freezer Error Code

All 7 causes, cheapest first

It also comes with

The glowing control panel on the front of a stainless undercounter freezer drawer in a home bar, a blurred, unreadable code beside a flashing warning light, an owner's manual lying open with out-of-focus pages on the counter above. Problem

Freezer Error Code

7 causes, cheapest first

Where EC40 usually leads

Freezer compressor and start relay repair.

Start relay, overload or compressor · moderate to highest.
Book a visit What the job involves

Sub-Zero
freezers.

Sub-Zero freezers repaired in the home, with the food kept shut in while the cause is found.

Sub-Zero freezer repair

More Sub-Zero codes

EC07EC0821222420 4 5095 1 0035 C 0090 5 80
A tall stainless steel built-in freezer column stands flush in white kitchen cabinetry in a US home, its door open on lit glass shelves and pull-out bins of frozen food. Sub-Zero builds this

Freezer column

A built-in, full-height freezer that stands alone in the cabinetry, often beside a matching fresh-food column, with a stainless or panel-ready door and an electronic control.

 Two stainless undercounter freezer drawers built into a US home bar island, the top drawer pulled out to show frost-free bins of ice cream pints and frozen fruit bags. Sub-Zero builds this

Undercounter freezer

A 15- to 24-inch freezer or a pair of freezer drawers built in under a counter, in a kitchen island, a home bar, a basement or a pool house, venting from the front.

In Sub-Zero's own words

Excessive freezer compressor run
Sub-Zero answer: 600, 648PRO, 700 Series EC40 and Service flashing Sub-Zero answer: IC-27 integrated columns error code 40 Sub-Zero answer: 600 Series error code 40

Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. 600, 648PRO and 700 Series (EC40 with Service flashing) and IC-27 integrated columns (40). Designer models log runtime problems as 40 with a zone digit instead.

Sub-Zero EC40 freezer repair,
where we come out.

The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered.

All service areas

Tampa BayFL · 31 areas

OrlandoFL · 30 areas

Miami / South FloridaFL · 47 areas

New York MetroNY · 75 areas

HoustonTX · 36 areas

ChicagoIL · 50 areas

Los AngelesCA · 95 areas

San DiegoCA · 31 areas

San Francisco Bay AreaCA · 74 areas

A parent and a child packing summer berries into bags beside an open upright freezer in a tidy garage
For the heart of your home.

Questions
about EC40.

Can I clear EC40 myself?
Read the freezer temperature on the display: if it is more than 10° above the setting and the door was not left open, keep the door shut and book a visit. If it comes back, it needs a visit.
Why does Sub-Zero say not to clear EC40 while the freezer is warm?
The logged code is what the technician reads to see what happened. If you clear it while temperatures are still high, the record of the long run is gone before anyone has diagnosed it.
Can a dirty condenser really set EC40 on a 700 Series freezer?
Yes. A clogged condenser cannot shed heat, so the compressor runs longer to hold temperature. Sub-Zero lists condenser cleaning as the first step when the temperature is only slightly high.
Does a door left open set EC40?
It can. A door that did not close lets warm air in and keeps the compressor running, and Sub-Zero names a door left ajar among the causes. If the door was the reason, temperatures usually recover once it is shut.

Back to your everyday

Still showing EC40?

Book with the code or the alarm pattern written exactly as the freezer shows it, the full model number, and whether the food is still frozen hard — when there is a code, that is where the diagnosis starts.

Schedule a repair Call (844) 456-4651
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