Frost closing the coil over again a week after it was cleared
An open element. A minute on the meter settles that, and it is the answer this code produces most often.
Defrost circuit: heater, terminator, thermistor $280–$690
Sub-Zero reference · Denver, CO
EC 24: heat was called for and did not arrive
EC 24 is a defrost that finished with the freezer coil still cold, and nothing recorded alongside it. Sub-Zero Pro Repair Denver measures the element, then where the element sits — (720) 704-2791.
Sub-Zero Pro Repair Denver — (720) 704-2791
Built-In 600-3 Series freezer defrost control
Two checks. That is the whole of Sub-Zero’s list for this code, and it is the shortest in the defrost group. Read the element’s resistance; if it is sound, look at where the element and the freezer sensor are fixed on the coil.
Nothing on that list mentions the compressor, and the distinction matters when a quote arrives. The machine is still making cold. What failed is the cycle that clears the coil so the cold can reach the food.
What we measure
- 01 Resistance across the defrost heater The first and shortest test on this code's list. An open element answers the code outright and needs no further reading.
- 02 Position of the heater and the freezer sensor on the coil Second and last on the list. An element working from the wrong place warms metal the sensor is not watching.
- 03 How the frost has built across the face of the coil An evenly bare coil and a patchy one point at different answers: a dead element against one out of position.
What it usually is
Half the coil clear and the lower passes still blocked solid
A heater that works but no longer runs the whole length of the coil, or a sensor remounted away from the heat. Both of them read as under-heat.
Defrost circuit: heater, terminator, thermistor $280–$690
The entry back a fortnight after a heater was fitted
A joint rather than a part. A terminal can read sound at room temperature and part company once current is through it. No band goes against this one.
No band covers this one — quoted after the diagnosis
Safe to keep running?
For a few days. Nothing here touches the cooling itself, so the compartment holds while frost closes the coil and the airflow drops behind it. Leave the ice where it is, though: the tubing behind that coil is thin, and a scraper turns a heater job into a far larger one.
Where this sits
- All Sub-Zero codes and display states Every code, display state and procedure on one page.
- EC 20 EC 20 stacks an under-heat on a silent feedback wire
- EC 07 EC 07 is the freezer compartment sensor, and the run-time list starts here
- Freezer Repair Freezer columns, sections and drawers that drift warm, ice over after each defrost, or store a run-time code.
Bench notes from
Tobias Reinhardt
- Trade
- Refrigeration technician — doors, gaskets and cabinet fit
- Years on the tools
- 9
- Metro
- Denver
- Holds
- EPA 608 certified
Checked against
Sub-Zero service manual #7003192 Rev C for the Built-In (600-3) Series: error code table, p. 8-2, and the two checks printed against code 24, p. 8-3
Reading it with you
Tell us what the panel is showing and we will tell you what we would measure first. Sub-Zero Pro Repair Denver — (720) 704-2791. On the road 8:00 am – 8:00 pm, seven days.
Read the cabinet before anyone quotes it
Describe the symptom on the phone and you will usually hear what it probably is before anyone drives out. A $89 service call covers the visit and the full diagnosis in Denver, and comes off the repair once you approve it.