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What this code means
The TCO has opened due to excessive temperature or a wiring issue (left oven, priority 1).
First step from the service manual
Check TCO.
Next steps: diagnose the root cause
1
Verify the error code is active
Power cycle the unit and see if the code returns. If it does, the fault is persistent and requires diagnosis.
2
Get the full diagnostic procedure
Get step-by-step guidance, test values, and wiring diagrams from the OEM service manual.
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Related Wolf range error codes
0021Bake element drive relay or triac is closed when it should be open (right oven).0022Bake element drive relay or triac is closed when it should be open (left oven).01Door Lock or Unlock Switches not sensed within 60 seconds while driving the…01-00RTD Open01-01RTD Shorted0121Right convection element drive relay or triac is closed when it should be open…0122Right convection element drive relay or triac is closed when it should be open…02Over temperature occurs when the oven reaches a temperature of 630°F for an…02-00Meat Probe Short0221Right or left oven bake/right convection element DLB relay shorted (right oven).0222Right or left oven bake/right convection element DLB relay shorted (left oven).03Continuous sensor activation on cooktop control glass, typically caused by…03-00No Inner Bake element detected.03-01No Outer Bake element detected.03-02No Broil element detected.03-03No Left Convection element detected.03-04No Right Convection element detected.03-05No MDL (Motor Door Lock) detected.03-06No Left Convection Fan detected.03-07No Right Convection Fan detected.03-08No Cooling Fan detected.03-09No Oven Light detected.0321Broil element drive relay or triac is closed when it should be open (right…0322Broil element drive relay or triac is closed when it should be open (left oven).04Shorted circuit detected on the RTD Sensor.04-00Lock inputs invalid.04-01Lock/Door inputs invalid for Clean.04-02MDL run timeout.0421Left convection element drive relay or triac is closed when it should be open…0422Left convection element drive relay or triac is closed when it should be open…05-00TCO (Thermal Cutoff) detected as open.0521Right or left oven broil/left convection element DLB relay shorted (right oven).0522Right or left oven broil/left convection element DLB relay shorted (left oven).06-00Brownout error.0631The DLB relay on the auxiliary outputs is closed when it should be open (right…0632The DLB relay on the auxiliary outputs is closed when it should be open (left…07SPI Communication lost from ECH to the Control Board as reported by Control…07-00Inner Bake relay shorted.07-01Outer Bake relay shorted.07-02Broil relay shorted.07-03Left Convection relay shorted.07-04Right Convection relay shorted.07-05MDL relay shorted.07-06Left Convection Fan triac shorted.07-07Right Convection Fan triac shorted.07-08Cooling Fan triac shorted.07-09Oven Light relay shorted.07-10DLB1 shorted.07-11DLB2 shorted.07-12Aux DLB shorted.07-13Inner Bake relay open.07-14Outer Bake relay open.07-15Broil relay open.07-16Left Convection relay open.07-17Right Convection relay open.07-18MDL relay open.07-19Left Convection Fan triac open.07-20Right Convection Fan triac open.07-21Cooling Fan triac open.07-22Oven Light relay open.07-23DLB1 relay or TCO open.07-24DLB2 relay open.07-25Aux DLB open.07-26RTD Circuitry error.07-27RM EE checksum error.07-28HIV SPI communication error detected by RM control.07-29HIV SPI communication error detected by HV-micro.07-30HIV micro feedback error.07-31RM LOV fuse error.07-32RM HIV fuse error.07-33HSWD active, should be inactive.07-34HSWD inactive, should be active.07-35RM Ambient Thermistor open error.07-36RM Ambient Thermistor shorted error.07-37RM Line Voltage A/D error.07-38MDL circuitry error.07-39RM FMEA circuitry error.08EEPROM checksum is incorrect08-00Keypad circuit error.08-01Keypad communications error detected by the UIM.08-02Keypad communications error detected by the Keypad.08-03Keypad FMEA error.08-04Keypad EE CRC error.08-05Keypad mains sync error.09Meat probe being sensed as shorted.09-00UIM EE checksum error.09-01UIM configuration data CRC error.09-02UIM fuse error.09-03UIM ambient thermistor open error.09-04UIM ambient thermistor shorted error.09-05LCD module error.0BAnalog to Digital error during calibration phase.0CCommunication lost with oven control board.0C21The NTC thermal cutoff on the right relay board is active (relay board over…0C22The NTC thermal cutoff on the left relay board is active (relay board over…0EPower relay shorted, sensed as closed when should be open10-00Communications error detected by the UIM.10-01Communications error detected by the RM (Relay Module).1021Bake element drive relay is open when it should be closed (right oven).1022Bake element drive relay is open when it should be closed (left oven).11-00Overtemp error11-01Overtemp error1121Right convection element drive relay is open when it should be closed (right…1122Right convection element drive relay is open when it should be closed (left…12-00RM Ambient overtemp error.1231Right or left oven bake/right convection element DLB relay open (right oven).1232Right or left oven bake/right convection element DLB relay open (left oven).13-00UIM Ambient overtemp error.1321Broil element drive relay is open when it should be closed (right oven).1322Broil element drive relay is open when it should be closed (left oven).14-00Self-clean rate-of-rise error.1421Left convection element drive relay is open when it should be closed (right…1422Left convection element drive relay is open when it should be closed (left…15-00LPM (Low Power Module) error.1531Right or left oven broil/left convection element DLB relay shorted (right oven).1532Right or left oven broil/left convection element DLB relay shorted (left oven).1621The DLB relay on the auxiliary outputs is open when it should be closed (right…1622The DLB relay on the auxiliary outputs is open when it should be closed (left…1731The drive circuit for the oven light is open when it should be conducting…1732The drive circuit for the oven light is open when it should be conducting (left…1831The drive circuit for the MDL is open when it should be conducting (right oven).1832The drive circuit for the MDL is open when it should be conducting (left oven).1931The drive circuit for the convection fan is open when it should be conducting…1932The drive circuit for the convection fan is open when it should be conducting…1A31The drive circuit for the left convection fan is open when it should be…1A32The drive circuit for the left convection fan is open when it should be…1B21The drive circuit for the cooling fan is open when it should be conducting…1B22The drive circuit for the cooling fan is open when it should be conducting…20Wrong connection2031The ambient temperature sensor circuit on the relay board is malfunctioning…2032The ambient temperature sensor circuit on the relay board is malfunctioning…2131The relay board calibration data is blank or corrupted (right oven).2132The relay board calibration data is blank or corrupted (left oven).22Pad error on cooktop control board.2421The RTD circuit on the relay board is malfunctioning (right oven).2422The RTD circuit on the relay board is malfunctioning (left oven).2521The MDL switch circuit on the relay board is malfunctioning (right oven).2522The MDL switch circuit on the relay board is malfunctioning (left oven).2631The door switch circuit on the relay board is malfunctioning (right oven).2632The door switch circuit on the relay board is malfunctioning (left oven).2721The watchdog has reset the right relay board.2722The watchdog has reset the left relay board.2931The incoming voltage level detection circuit on the relay board is…2932The incoming voltage level detection circuit on the relay board is…2A31No communications or too many bad packets between the two processors on the…2A32No communications or too many bad packets between the two processors on the…2B31One of the output monitor circuits on the relay board is malfunctioning (right…2B32One of the output monitor circuits on the relay board is malfunctioning (left…2C21The relay board detects an error with the RS485 network (right oven).2C22The relay board detects an error with the RS485 network (left oven).2F21Hardware fault on the high-voltage control of the relay board (right).2F22Hardware fault on the high-voltage control of the relay board (left).30Data flash error, result of flashing software.3031The temperature probe is broken, socket is broken or wired wrong; probe circuit…3032The temperature probe is broken, socket is broken or wired wrong; probe circuit…31Invalid configuration on generator.3121RTD is broken or wired wrong; RTD circuit reporting below 1091 Ω ±5.3 Ω @ 75°F…3122RTD is broken or wired wrong; RTD circuit reporting below 1091 Ω ±5.3 Ω @ 75°F…3221The RTD is broken or wired wrong; RTD circuit reporting below 3049 ohms (right…3222The RTD is broken or wired wrong; RTD circuit reporting below 3049 ohms (left…3311The TCO has opened due to excessive temperature or a wiring issue (right oven…3421The MDL has run too long without finding the correct position (right oven).3422The MDL has run too long without finding the correct position (left oven).3521The door switch is open while in self-clean or the MDL is not locked in…3522The door switch is open while in self-clean or the MDL is not locked in…36TC (control) temperature too high.3721The MDL lock switch and unlock switch are closed at the same time (right oven).3722The MDL lock switch and unlock switch are closed at the same time (left oven).3821The incoming voltage on the bake element bank is irregular or not detected…3822The incoming voltage on the bake element bank is irregular or not detected…39Controller options error.3921The incoming voltage on the broil element bank is irregular or not detected…3922The incoming voltage on the broil element bank is irregular or not detected…3A21The incoming voltage on an auxiliary element bank is irregular or not detected…3A22The incoming voltage on an auxiliary element bank is irregular or not detected…3B20The incoming voltage is below 177V.3C20The incoming voltage is above 265V.3D20The incoming frequency is below 47 Hz or above 63 Hz.3E21The status and the data register of the low voltage control output pins are not…3E22The status and the data register of the low voltage control output pins are not…3F21The relay board did not receive any Set oven output status messages within the…3F22The relay board did not receive any Set oven output status messages within the…4021No load detected when the bake/broil/convection element is turned on.4022No load detected when the bake element is turned on (left oven).4121No load detected when the right convection element is turned on (right oven).4122No load detected when the right convection element is turned on (left oven).4221No load detected when the broil element is turned on (right oven).4222No load detected when the broil element is turned on (left oven).4321No load detected when the left convection element is turned on (right oven).4322No load detected when the left convection element is turned on (left oven).4421No load detected when the cooling fan is turned on, or the drive circuit for…4422No load detected when the cooling fan is turned on, or the drive circuit for…4531No load detected when the right convection fan is turned on, or the drive…4532No load detected when the right convection fan is turned on, or the drive…4631No load detected when the left convection fan is turned on, or the drive…4632No load detected when the left convection fan is turned on, or the drive…47LIN communication error between control board and generators.4731No load detected when the oven light is turned on, or the drive circuit for the…4732No load detected when the oven light is turned on, or the drive circuit for the…4821No load detected when the MDL is turned on, or the drive circuit for the MDL is…4822No load detected when the MDL is turned on, or the drive circuit for the MDL is…4F21The requested output state is not equal to the feedback response of the relay…4F22The requested output state is not equal to the feedback response of the relay…5021RTD senses temperature above 950°F (510°C) while in clean mode (right oven).5022RTD senses temperature above 950°F (510°C) while in clean mode (left oven).5121RTD senses temperature above 600°F (316°C) while not in clean mode (right oven).5122RTD senses temperature above 600°F (316°C) while not in clean mode (left oven).5221Relay board ambient temperature sensor is over 216°F (right oven).5222Relay board ambient temperature sensor is over 216°F (left oven).5321UIM ambient temperature sensor is over 185°F (85°C).5521The cooling fan speed is below the minimum threshold (right oven).5522The cooling fan speed is below the minimum threshold (left oven).6020The UIM detects an error with the RS485 network.6320The configuration data on the UIM is corrupt or has invalid values.6A10RAM on the UIM has failed the memory test.6C30UIM detects an error on the USB network.8110The UIM display has a fault.9010Touch screen (POD/ECH) is not responding to inputs.A026The relay board ambient temperature sensor is over 217°F (left relay board).A027The relay board ambient temperature sensor is over 217°F (right relay board).A03FReference for RTD circuit is not correct (left relay board).A040Reference for RTD circuit is not correct (right relay board).A0BCRTD data from the relay board is not plausible (left).A0BERTD data from the relay board is not plausible (right).A0C0Relay board has wasted too many communication frames (left relay board).A0C1Relay board has wasted too many communication frames (right relay board).E 01Key error on the left secondary control board.E 02Key error on the right secondary control board.E 03Key error on the primary control board.E 04Data flash error; a cyclic reset of the controller (not a shown error).E 05LIN communication errorE 07Primary control board (TC) temperature too high.E 09Coil assembly 1 temperature too high.E 10Coil assembly 2 temperature too high.E 11Coil assembly 3 temperature too high.E 12Coil assembly 4 temperature too high.E 13Coil assembly 5 temperature too high.E 14Configuration implausible (CRC error of configuration data or configuration…E 15Power supply error on generator; generator voltage too low.E 16Unspecified generator error.E 17Unspecified primary control board error.E 18Unspecified left secondary control board error.E 19Unspecified right secondary control board error.E 20Temperature monitoring error on generator (heat sink sensor failure…E 21Controller cyclic reset error (primary, left secondary, right secondary).E 30Generator relay error.E 31Invalid potentiometerE 32Coil temperature sensorE 33Coil temperature sensor; two wire connection from the coil NTC to the generator…E 34Fan 2 errorE 35Fan 3 errorE 36Fan 4 errorE 37Fan 4 errorE 38Fan 5 errorE 39Generator hardware error (ADC error 0x32 or 0x50).E 40Generator hardware error (Sync error 0x33).E 41Generator hardware error (PWM output error 0x23).E 42Generator hardware error (cyclic reset of generator 0x20).E 43Generator hardware error (cyclic reset of generator 0x39).E 45LIN hardware error on primaryE 46RS485 hardware error on primary; not a shown error, only logged for the options…E 47Power supply error on primary; voltage regulator on the primary is broken.E 48Power supply error on left secondary; voltage regulator on the left secondary…E 49Power supply error on right secondary; voltage regulator on the right secondary…E 50Continuous key push on the primaryE 51Continuous key push on the left secondaryE 52Continuous key push on the right secondaryE 53Left secondary defect or wire harness broken; no communication with the left…E 54Right secondary defect or wire harness broken; no communication with the right…E 55Primary communication error; possible communication hardware error on the…E 56Left secondary temperature too high.E 57Right secondary temperature too high.E 61Hardware error on primary; NTC failure.E 62Hardware error on left secondary; NTC failure.E 63Hardware error on right secondary; NTC failure.E00Overvoltage condition detected on the power supply lines.E08Invalid induction configuration detected.E2Coil temperature too high.E4Configuration implausible (control board issue).E58Knob error due to contact or rubbing between knob and bezel.E6Power supply errorE60Low voltage detected on the control board.E7Unspecified error, usually accompanied by another error.E8Fan error on generator board.E9Temperature monitoring error.EAController error on cooktop.ErrError code has been logged into oven controller.HotOven temperature too hot for cooking mode selected; a mode was attempted while…PFUnit had a power failure.SAbUnit is in Sabbath feature.U400Over voltage on cooking zone.
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