Commercial Chef
Commercial Chef Microwaves Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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dE
Microwave displays dE or "door" and will not start a cycle.
Door Open Detection Error
E1
Microwave beeps and displays E1, will not start a cooking cycle.
Door Switch Input Error
E2
Microwave displays E2 and stops heating shortly after starting.
Temperature Sensor / Thermistor Fault
E3
Microwave shows E3 and will not heat, fan may run briefly then stop.
Magnetron Overheat / Thermal Cutout Trip
E4
Microwave displays E4 and will not start, sometimes after a power surge or outage.
Control Board Communication / EEPROM Error
E5
Microwave shows E5 and stops mid-cycle, often accompanied by a relay clicking sound.
High Voltage System Protection / Overcurrent Fault
E6
Microwave displays E6 and keypad may be unresponsive or partially responsive.
Keypad / Touch Panel Error
E7
Microwave shows E7 and the turntable does not rotate, though the unit may still heat.
Turntable Motor / Position Error
E8
Microwave displays E8 and stops heating, fan may continue to run.
Cooling Fan / Airflow Error
E9
Microwave shows E9 and will not start, often after a door slam or impact.
Door Latch / Interlock Mechanism Error
H0
Microwave displays H0 or HO and does not heat, though lights and fan may operate.
Magnetron / High Voltage Failure
H1
Microwave displays H1 or "Hot" and will not start a new cycle immediately after heavy use.
Cavity Overheat Protection
LOC
Microwave displays LOC or a lock icon and will not start; keypad appears disabled.
Child Lock / Control Lock Activated
PF
Microwave displays PF or "Power Failure" and beeps after an outage or brief power loss.
Power Interruption / Line Voltage Event
SE
Microwave displays SE or "SENSOR" error and cancels sensor-cook programs.
Humidity / Steam Sensor Error
Symptom
Microwave buttons are unresponsive or only some keys work intermittently.
Membrane Keypad Wear / Failure
Symptom
Microwave clock and settings reset to default every time it is unplugged or after brief power interruptions.
Loss of Non-Volatile Memory / Backup Power
Symptom
Microwave cooking is uneven; some areas of food are very hot while others remain cold.
Uneven Heating / Distribution Issue
Symptom
Microwave display works but is very dim or segments are missing.
Display / VFD / LED Failure
Symptom
Microwave door will not open or is very hard to open after cooking.
Door Latch / Release Mechanism Binding
Symptom
Microwave door will not stay closed or pops open during operation.
Door Latch Retention Failure
Symptom
Microwave emits a burning smell or visible smoke from the interior during or after use.
Interior Arcing or Component Overheating
Symptom
Microwave emits a strong chemical or plastic smell the first few times it is used.
Normal Burn-In Odor / Residual Manufacturing Oils
Symptom
Microwave exterior (top or sides) becomes excessively hot to the touch during normal use.
Insufficient Ventilation / Cooling
Symptom
Microwave fan runs but turntable and magnetron do not start; unit sounds like it is in a cool-down mode only.
Stuck in Vent / Fan Mode
Symptom
Microwave has power and display, but pressing START does nothing; no relay click, no fan, no light.
No Start – Control or Door Interlock Fault
Symptom
Microwave interior light does not come on when the door is opened or during cooking, but unit otherwise works.
Interior Light Circuit Failure
Symptom
Microwave interior light stays on when the door is closed and not running.
Door Switch Logic Fault – Light Circuit Stuck
Symptom
Microwave interior shows sparking or arcing, especially near the side wall or around the waveguide cover.
Microwave Cavity Arcing
Symptom
Microwave light, fan, and turntable run when the door is closed, even without pressing START.
Stuck Relay or Miswired Door Switch – Unintended Operation
Symptom
Microwave makes a rattling or scraping noise when the turntable rotates.
Turntable Mechanical Noise
Symptom
Microwave makes loud buzzing or humming noise while running, louder than normal, sometimes with reduced heating.
Noisy High Voltage Transformer or Magnetron
Symptom
Microwave produces a loud popping sound and stops heating, sometimes accompanied by a burnt smell.
Component Failure with Internal Arcing
Symptom
Microwave runs but does not heat food; turntable and light work, timer counts down normally.
No Heat – High Voltage System Failure
Symptom
Microwave runs for a few seconds then shuts off completely, sometimes resetting the clock.
Overcurrent or Overheat Shutdown
Symptom
Microwave trips the household breaker or blows a fuse as soon as START is pressed.
Short Circuit Under Load – High Voltage or Line Short
Symptom
Microwave turntable does not rotate, but heating still occurs.
Turntable Drive Failure
Symptom
Microwave will not start at all; display is blank and no lights or sounds when pressing buttons.
No Power – Primary Power Circuit Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| dE |
Microwave displays dE or "door" and will not start a cycle.
|
Door Open Detection Error | View Details |
| E1 |
Microwave beeps and displays E1, will not start a cooking cycle.
|
Door Switch Input Error | View Details |
| E2 |
Microwave displays E2 and stops heating shortly after starting.
|
Temperature Sensor / Thermistor Fault | View Details |
| E3 |
Microwave shows E3 and will not heat, fan may run briefly then stop.
|
Magnetron Overheat / Thermal Cutout Trip | View Details |
| E4 |
Microwave displays E4 and will not start, sometimes after a power surge or outage.
|
Control Board Communication / EEPROM Error | View Details |
| E5 |
Microwave shows E5 and stops mid-cycle, often accompanied by a relay clicking sound.
|
High Voltage System Protection / Overcurrent Fault | View Details |
| E6 |
Microwave displays E6 and keypad may be unresponsive or partially responsive.
|
Keypad / Touch Panel Error | View Details |
| E7 |
Microwave shows E7 and the turntable does not rotate, though the unit may still heat.
|
Turntable Motor / Position Error | View Details |
| E8 |
Microwave displays E8 and stops heating, fan may continue to run.
|
Cooling Fan / Airflow Error | View Details |
| E9 |
Microwave shows E9 and will not start, often after a door slam or impact.
|
Door Latch / Interlock Mechanism Error | View Details |
| H0 |
Microwave displays H0 or HO and does not heat, though lights and fan may operate.
|
Magnetron / High Voltage Failure | View Details |
| H1 |
Microwave displays H1 or "Hot" and will not start a new cycle immediately after heavy use.
|
Cavity Overheat Protection | View Details |
| LOC |
Microwave displays LOC or a lock icon and will not start; keypad appears disabled.
|
Child Lock / Control Lock Activated | View Details |
| PF |
Microwave displays PF or "Power Failure" and beeps after an outage or brief power loss.
|
Power Interruption / Line Voltage Event | View Details |
| SE |
Microwave displays SE or "SENSOR" error and cancels sensor-cook programs.
|
Humidity / Steam Sensor Error | View Details |
| – |
Microwave buttons are unresponsive or only some keys work intermittently.
|
Membrane Keypad Wear / Failure | View Details |
| – |
Microwave clock and settings reset to default every time it is unplugged or after brief power interruptions.
|
Loss of Non-Volatile Memory / Backup Power | View Details |
| – |
Microwave cooking is uneven; some areas of food are very hot while others remain cold.
|
Uneven Heating / Distribution Issue | View Details |
| – |
Microwave display works but is very dim or segments are missing.
|
Display / VFD / LED Failure | View Details |
| – |
Microwave door will not open or is very hard to open after cooking.
|
Door Latch / Release Mechanism Binding | View Details |
| – |
Microwave door will not stay closed or pops open during operation.
|
Door Latch Retention Failure | View Details |
| – |
Microwave emits a burning smell or visible smoke from the interior during or after use.
|
Interior Arcing or Component Overheating | View Details |
| – |
Microwave emits a strong chemical or plastic smell the first few times it is used.
|
Normal Burn-In Odor / Residual Manufacturing Oils | View Details |
| – |
Microwave exterior (top or sides) becomes excessively hot to the touch during normal use.
|
Insufficient Ventilation / Cooling | View Details |
| – |
Microwave fan runs but turntable and magnetron do not start; unit sounds like it is in a cool-down mode only.
|
Stuck in Vent / Fan Mode | View Details |
| – |
Microwave has power and display, but pressing START does nothing; no relay click, no fan, no light.
|
No Start – Control or Door Interlock Fault | View Details |
| – |
Microwave interior light does not come on when the door is opened or during cooking, but unit otherwise works.
|
Interior Light Circuit Failure | View Details |
| – |
Microwave interior light stays on when the door is closed and not running.
|
Door Switch Logic Fault – Light Circuit Stuck | View Details |
| – |
Microwave interior shows sparking or arcing, especially near the side wall or around the waveguide cover.
|
Microwave Cavity Arcing | View Details |
| – |
Microwave light, fan, and turntable run when the door is closed, even without pressing START.
|
Stuck Relay or Miswired Door Switch – Unintended Operation | View Details |
| – |
Microwave makes a rattling or scraping noise when the turntable rotates.
|
Turntable Mechanical Noise | View Details |
| – |
Microwave makes loud buzzing or humming noise while running, louder than normal, sometimes with reduced heating.
|
Noisy High Voltage Transformer or Magnetron | View Details |
| – |
Microwave produces a loud popping sound and stops heating, sometimes accompanied by a burnt smell.
|
Component Failure with Internal Arcing | View Details |
| – |
Microwave runs but does not heat food; turntable and light work, timer counts down normally.
|
No Heat – High Voltage System Failure | View Details |
| – |
Microwave runs for a few seconds then shuts off completely, sometimes resetting the clock.
|
Overcurrent or Overheat Shutdown | View Details |
| – |
Microwave trips the household breaker or blows a fuse as soon as START is pressed.
|
Short Circuit Under Load – High Voltage or Line Short | View Details |
| – |
Microwave turntable does not rotate, but heating still occurs.
|
Turntable Drive Failure | View Details |
| – |
Microwave will not start at all; display is blank and no lights or sounds when pressing buttons.
|
No Power – Primary Power Circuit Failure | View Details |
No matching codes found
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