The most common Sub Zero Refrigerator error codes

💡Below are some of the most common Sub Zero Refrigerator error codes:

Sub Zero Wine Storage Units 400 Series – Possible error indicators

NOTE: Temperatures shown are for reference only, actual temperatures may vary.

Temp 55 + SERVICE (Flashing) Error Code EE – Upper compartment thermistor fault

BELL ON (Flashing)
Temp 55 + SERVICE (Flashing) Error Code EE – Upper compartment thermistor fault with temperature alarm

Temp EE + SERVICE (Flashing) Error Code 55 – Lower compartment thermistor fault

BELL ON (Flashing)
Temp EE + SERVICE (Flashing) 55 – Lower compartment thermistor fault with temperature alarm

Temp 55 + SERVICE (Flashing) 55 – Either evaporator thermistor fault

BELL ON (Flashing)
Temp 55 SERVICE (Flashing) 55 – Either evaporator thermistor fault with temperature alarm

NOTE: Cooling functions are disabled when error indicators appear.

Sub Zero Refrigerator MODEL 427R 400 SERIES – Possible Error Indicators

NOTE: Temperature shown is for reference only, actual temperature may vary.
TOP DRAWER (Flashing)
Temp EE + LOWER DRAWER (Flashing) – Refrigerator compartment thermistor fault
TOP DRAWER (Flashing)
Temp 40 + LOWER DRAWER (Flashing) – Refrigerator evaporator thermistor fault.
Temp E0
700BR & 700BF Communication Error between – Control Board & Control Panel
Temp E3
700BR & 700BF Communication Error between – Control Board & Control Panel

Sub Zero 400-2 SERIES WINE STORAGE – Possible Error Indicators

NOTE: Temperatures shown are for reference only, actual temperatures may vary.
Temp 55 + SERVICE (Flashing) EE – Upper compartment thermistor fault
BELL ON (Flashing)
Temp 55 + SERVICE (Flashing) EE – Upper compartment thermistor fault with temperature alarm
Temp EE + SERVICE (Flashing) 55 – Lower compartment thermistor fault
BELL ON (Flashing)
Temp EE + SERVICE (Flashing) 55 – Lower compartment thermistor fault with temperature alarm
Temp 55 + SERVICE (Flashing) 55 – Either evaporator thermistor fault
BELL ON (Flashing)
Temp 55 + SERVICE (Flashing) 55 – Either evaporator thermistor fault with temperature alarm
NOTE: Cooling functions are disabled when error indicators appear.

Sub Zero 400-2 SERIES WINE STORAGE

CODE INDICATION
05 Upper Cabinet Thermistor read open / short for 10+ seconds, or repeatedly erratic tempís.
06 Upper Evap. Thermistor read open / short for 10+ seconds, or repeatedly erratic tempís.
07 Lower Cabinet Thermistor read open / short for 10+ seconds, or repeatedly erratic tempís.
08 Lower Evap. Thermistor read open / short for 10+ seconds, or repeatedly erratic tempís.
10 Upper Cabinet Warm Temperature alarm
11 Upper Cabinet Cold Temperature alarm
12 Lower Cabinet Warm Temperature alarm
13 Lower Cabinet Cold Temperature alarm
15 Sealed System Fault (evap temp. cannot drop 5∞ in 5 minutes, 3 consecutive valve activations)

Sub Zero 400-2 SERIES – 427R-2 REFRIGERATOR CODE INDICATION

05 Upper Cabinet Thermistor read open / short for 10+ seconds, or repeatedly erratic tempís.
50 Excessive Refrigerator compressor run

Sub Zero 600 SERIES (Prior To Serial #1810000)

Possible Error Indicators
NOTE: Temperatures shown are for reference only, actual temperatures may vary.
Temp EE + SERVICE (Flashing) Code 38 – Freezer compartment thermistor Fault
Temp 00 + SERVICE (Flashing) Code EE – Refrigerator compartment thermistor fault
Temp 00 + SERVICE (Flashing) Code 38 – Refrigerator evaporator thermistor fault
SERVICE (Flashing)
Temp 00 ICE (Flashing) Code 38 – Water valve energized longer than 15 seconds. Icemaker system disabled.
NOTE: A 45 minute dwell follows each IM cycles (no power to Icemaker). To bypass 45 minute dwell, Switch unit OFF then back ON.
SERVICE (Flashing)
12 VACUUM (Flashing) Code 45 – CONDENSER:Several excessive compressor run periods

Sub Zero 600 SERIES (Starting With Serial #1810000)

Possible Error Indicators
NOTE: Temperatures shown are for reference only, actual temperatures may vary.
Temp EE + SERVICE (Flashing) Code 38 – Freezer compartment thermistor fault
Temp 00 + SERVICE (Flashing) Code EE – Refrigerator compartment thermistor fault
Temp 00 + SERVICE (Flashing) Code 38 – Several excessive compressor run periods OR Refrigerator evaporator thermistor fault
SERVICE (Flashing)
Temp 00 ICE (Flashing) Code 38 – Water valve energized longer than 15 seconds. Icemaker system disabled.
NOTE: A 45 minute dwell follows each IM cycles (no power to Icemaker). To bypass 45 minute dwell, Switch unit OFF then back ON.
CODE INDICATION
05 Refrig. Cabinet Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic tempís
06 Refrig. Evaporator Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic tempís
07 Freezer Cabinet Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic tempís
08 Freezer Evaporator Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic tempís
20 Defrost Underheat with No Voltage Feedback Through Gray/White Wire at Defrost Start
21 Defrost Overheat
22 No Voltage Feedback Through Gray/White Wire at Defrost Start
23 Defrost Overheat with No Voltage Feedback through Gray/White Wire at Defrost Start
24 Defrost Underheat

Sub Zero 600-2 SERIES

Possible Error Indicators
NOTE: Temperatures shown are for reference only, actual temperatures may vary.
Temp EE SERVICE (Flashing) Code 38 – Freezer compartment thermistor fault
Temp 00 SERVICE (Flashing) Code EE – Refrigerator compartment thermistor fault
Temp 00 SERVICE (Flashing) Code 38 – Several excessive compressor run periods OR- Refrigerator evaporator thermistor fault
SERVICE (Flashing)
Temp 00 ICE (Flashing) Code 38 – Water valve energized longer than 15 seconds, five consecutive times. Icemaker system disabled 24 hours each time.
NOTE: A 45 minute dwell follows each IM cycles (no power to Icemaker). To bypass 45 minute dwell, Switch ice maker system OFF then back ON.
Temp 00 SERVICE (Steady, not Flashing)Code 38 – Error Codes logged and observed but not cleared.
CODE INDICATION
05 Ref. cabinet therm. read open, short or erratic temp for 10+ secís
06 Ref. evap. therm. read open, short or erratic temp for 10+ secís
07 Fre. cabinet therm. read open, short or erratic temp for 10+ secís
08 Fre. evap. therm. read open, short or erratic temp for 10+ secís
20 Defrost underheat & no feedback thru Gr/Wh wire at defrst start
21 Defrost overheat
22 No feedback thru Gr/Wh wire at defrost start
23 Defrost overheat & no feedback thru Gr/Wh wire at defrost start
24 Defrost underheat
30 Excess IM Water Valve Solenoid Activation (> 15 Seconds)
40 Excessive Freezer Comp Run
50 Excessive Refrigerator Comp Run

Sub Zero 700 SERIES

Possible Error Indicators
(- -) –  Control is shut off. Press COLDER key to start unit.
(- 20 ) – Zone/Compartment thermistor fault. Repair wiring or replace thermistor.
( 55) –  Zone/Compartment thermistor shorted. Repair wiring or replace thermistor.
(Su) – Blue wire of display cable unhooked or faulty. Repair wiring.
(- 88 ) –  Red Wire of display cable unhooked or faulty, top lights are off and keys are inoperative.

Sub Zero 700-2 SERIES (Tall Units)

Possible Error Indicators
NOTE: Temperatures shown are for reference only, actual temperatures may vary.
EE SERVICE (Flashing) 38 – Freezer compartment thermistor Fault
00 SERVICE (Flashing) EE – Refrigerator compartment thermistor fault
00 SERVICE (Flashing) 38 – Several excessive compressor run periods OR Refrigerator evaporator thermistor fault
SERVICE (Flashing)
00 ICE (Flashing) 38 – Water valve energized longer than 15 seconds. Ice maker system disabled.
NOTE: A 45 minute dwell follows each IM cycles (no power to Icemaker). To bypass 45 minute dwell, Switch unit OFF then back ON.

Sub Zero 700-2 SERIES (Tall Units)Starting W/ Serial #1756193

CODE INDICATION
05 Ref. cabinet therm. read open, short or erratic temp for 10+ secís
06 Ref. evap. therm. read open, short or erratic temp for 10+ secís
07 Fre. cabinet therm. read open, short or erratic temp for 10+ secís
08 Fre. evap. therm. read open, short or erratic temp for 10+ secís
20 Defrost underheat & no feedback thru Gr/Wh wire at defrst start
21 Defrost overheat
22 No feedback thru Gr/Wh wire at defrost start
23 Defrost overheat & no feedback thru Gr/Wh wire at defrost start
24 Defrost underheat
80 High VS compressor differential pressures or low voltage supplied to VS compressor
81 High Amperage Draw at VS compressor
82 VS comp. couldnít maintain min. speed at highest current draw
83 Locked VS compressor Rotor
84 Short circuit at VS compressor controller output circuit
85 VS compressor inverter overheated & shut down VS compressor
86 Serial communication failure between VS compressor controller and electronic control board
87 Speed information from electronic control board is out of spec.
88 Electronic control board not receiving status data in response to speed commands
NOTE: VS Compressor = Variable Speed Compressor

Sub Zero 700-3 SERIES – TALL UNITS

CODE INDICATION
05 Ref. cabinet therm. read open, short or erratic temp for 10+ secís
06 Ref. evap. therm. read open, short or erratic temp for 10+ secís
07 Fre. cabinet therm. read open, short or erratic temp for 10+ secís
08 Fre. evap. therm. read open, short or erratic temp for 10+ secís
20 Defrost underheat & no feedback thru Gr/Wh wire at defrst start
21 Defrost overheat
22 No feedback thru Gr/Wh wire at defrost start
23 Defrost overheat & no feedback thru Gr/Wh wire at defrost start
24 Defrost underheat
30 Excess IM Water Valve Solenoid Activation (> 15 Seconds)
40 Excessive Freezer Comp Run
50 Excessive Refrigerator Comp Run

Sub Zero 700-3 SERIES – BASE UNITS

CODE INDICATION
05 Ref. cabinet therm. read open, short or erratic temp for 10+ secís
06 Ref. evap. therm. read open, short or erratic temp for 10+ secís
07 Fre. cabinet therm. read open, short or erratic temp for 10+ secís
08 Fre. evap. therm. read open, short or erratic temp for 10+ secís
20 Defrost underheat & no feedback thru Gr/Wh wire at defrst start
21 Defrost overheat
22 No feedback thru Gr/Wh wire at defrost start
23 Defrost overheat & no feedback thru Gr/Wh wire at defrost start
24 Defrost underheat
30 NA
40 Excessive Freezer Comp Run
50 Excessive Refrigerator Comp Run

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