A letter with no number beside it that the owner reads as a code
A label doing its job. The letter exists so the next figure has an owner. Nothing about it is a fault.
No band covers this one — quoted after the diagnosis
Sub-Zero reference · Denver, CO
F, r, FE and rE: the letters before the temperatures
F, r, FE and rE are not faults. Each letter names the thermistor whose temperature comes next on the display in Diagnostic Mode. Sub-Zero Pro Repair Denver reads the pairs against each other — (720) 704-2791.
Sub-Zero Pro Repair Denver — (720) 704-2791
Built-In panels read in Diagnostic Mode, older and newer alike
Enter Diagnostic Mode and the panel does not simply list temperatures. It puts a letter up first, then the figure that belongs to it. F is the freezer compartment, r the refrigerator compartment, FE the freezer coil and rE the refrigerator coil.
Read as pairs, they answer what a single figure cannot: is the compartment warm because the coil is warm, or in spite of it.
What we measure
- 01 Which letters the cabinet offers at all A combination cabinet lists four. One that only refrigerates lists the refrigerator pair; a freezer lists the freezer pair. The set says what the cabinet is.
- 02 Compartment temperature against evaporator temperature, per side The pair is the reading. A compartment sitting warm over a coil that is cold separates an airflow problem from a cooling one.
- 03 Whether any letter returns EE instead of a figure That probe is disconnected, shorted or misread. The letter still names it, so the panel tells us exactly which one to test.
- 04 The same letters again, after anything has been changed A location code is only worth what the second reading says. Figures that have moved confirm the repair; figures that have not send us back.
What it usually is
A compartment reading normally while its evaporator letter reads high
The manual sorts its causes by evaporator temperature for exactly this reason. The coil figure moves first; the shelf follows.
No band covers this one — quoted after the diagnosis
An older cabinet offering a fifth letter the newer ones do not
An inactive line, listed on the earlier generation's table. It is part of how that control describes itself, not a fault it is reporting.
No band covers this one — quoted after the diagnosis
Safe to keep running?
There is nothing here to keep running from. Letters are labels, and a cabinet showing them is simply being read. What matters is the figure each letter introduces: if one of those is wrong, that is where the diagnosis starts.
Where this sits
- All Sub-Zero codes and display states Every code, display state and procedure on one page.
- Diagnostic How a Sub-Zero gives up what it has stored
- EC 07 EC 07 is the freezer compartment sensor, and the run-time list starts here
- Refrigerator Repair Built-ins and panel-ready columns that run warm, never switch off, or put a code where a temperature belongs.
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 Built-In (600-3) service manual #7003192 Rev C, Thermistor Location Code Tables p. 8-5, and 600 Series service manual #3756270 Rev B, p. 8-2
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.