Schumacher
Schumacher EV Home Chargers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
EV charger will not start charging; display shows E1 shortly after plugging into vehicle.
Pilot Signal Communication Fault
E10
Charger shows E10 and stops charging; may occur during hot weather or long sessions.
Overtemperature – Output Cable / Connector
E11
Display shows E11; charger will not start and may indicate a lock or key symbol.
Proximity / Latch Switch Fault
E12
Charger shows E12 and refuses to start; may be accompanied by a network or Wi‑Fi icon flashing on smart models.
Internal Configuration / Calibration Error
E13
Display shows E13; charger may not recognize that a vehicle is connected.
Vehicle Detection / Pilot Duty Cycle Error
E14
Charger shows E14 and stops charging; may occur when vehicle requests high current.
Current Sensor Calibration / Range Error
E15
Display shows E15; charger may not power up fully or may reboot repeatedly.
Low-Voltage Power Supply Fault
E16
Charger shows E16; smart features may be disabled and charging may be limited or blocked.
Network / OCPP Communication Fault (Smart Models)
E17
Display shows E17; charger indicates a schedule or authorization error and will not start.
User Authorization / RFID Fault (If Equipped)
E18
Charger shows E18 and immediately stops when vehicle is connected; may indicate polarity or wiring issue.
Line Wiring / Polarity Error
E19
Display shows E19; charger may indicate a self-test failure at startup.
Self-Test / Internal Safety Relay Test Failure
E2
Charger display shows E2 and refuses to start charging when connected to vehicle.
Ground Fault / Leakage Current Detected
E20
Charger shows E20; may indicate a time or clock synchronization error on smart models.
Real-Time Clock / Scheduling Error
E3
Display shows E3 and charging stops or will not start.
Overvoltage Input Protection Trip
E4
Charger shows E4 and does not energize the vehicle; fan may run briefly then stop.
Undervoltage / Brownout Protection
E5
Display shows E5 and charging stops; unit may feel warm to the touch.
Overtemperature Protection – Internal Electronics
E6
Charger displays E6 and refuses to start; sometimes occurs immediately when powered up.
Relay/Contactor Welded or Stuck
E7
Display shows E7; charger may start then immediately stop charging.
Output Overcurrent / Short Circuit Protection
E8
Charger shows E8 and does not charge; may occur after a surge or lightning event.
Internal Communication Error Between Control Board and Power Module
E9
Display shows E9; charger will not start charging and may beep or flash LEDs.
Ground Continuity / Protective Earth Fault
Symptom
Charger clicks repeatedly (relay chatter) when a vehicle is connected, but charging does not start.
Unstable Contactor Control / Pilot Negotiation Failure
Symptom
Charger display is on but very dim or flickering; unit may reboot randomly.
Unstable Low-Voltage DC Supply
Symptom
Charger display shows incorrect amperage or energy readings compared to the vehicle or an external meter.
Metering / Current Sensing Inaccuracy
Symptom
Charger emits a strong burning smell or visible smoke during operation.
Severe Overheating / Component Failure
Symptom
Charger fan runs loudly or continuously even when not charging.
Cooling Fan Control or Temperature Sensor Drift
Symptom
Charger has no power at all – display is blank, no LEDs, and no relay click when vehicle is connected.
No AC Supply / Internal Fuse or Breaker Open
Symptom
Charger intermittently trips the home’s GFCI breaker or AFCI breaker, but the charger itself shows no error.
Nuisance Tripping Due to Leakage or Inrush
Symptom
Charger makes a high-pitched whining or buzzing noise during operation.
Audible Noise from Power Electronics or Contactor
Symptom
Charger mounting bracket or housing is loose on the wall; unit may vibrate when plugging in.
Mechanical Mounting / Bracket Loosening
Symptom
Charger or cable becomes excessively hot during normal charging, but no error code appears.
High-Resistance Connection / Overheating Conductors
Symptom
Charger powers on and shows ready, but will not start charging when plugged into any vehicle; no error code displayed.
Pilot Signal Not Detected by Vehicle
Symptom
Charger starts charging but stops after a few minutes without any error code; user must unplug and replug to restart.
Intermittent Overtemperature or Ground Fault Trip Without Displayed Code
Symptom
Charger’s cable insulation is cracked, stiff, or shows signs of UV damage.
Aged or Environmentally Damaged Output Cable
Symptom
Charger’s front panel buttons or touch controls do not respond reliably.
Front Panel / Keypad Failure
Symptom
Charger’s Wi‑Fi or app connection frequently drops, but charging continues.
Unstable Wireless Communication
Symptom
Visible arcing or sparking at the J1772 connector when plugging in or unplugging.
Connector Contact Damage / Improper De-Energization
Symptom
Water or condensation visible inside the charger housing or around the cable entry; charger may behave erratically.
Moisture Ingress / Compromised Enclosure Seal
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
EV charger will not start charging; display shows E1 shortly after plugging into vehicle.
|
Pilot Signal Communication Fault | View Details |
| E10 |
Charger shows E10 and stops charging; may occur during hot weather or long sessions.
|
Overtemperature – Output Cable / Connector | View Details |
| E11 |
Display shows E11; charger will not start and may indicate a lock or key symbol.
|
Proximity / Latch Switch Fault | View Details |
| E12 |
Charger shows E12 and refuses to start; may be accompanied by a network or Wi‑Fi icon flashing on smart models.
|
Internal Configuration / Calibration Error | View Details |
| E13 |
Display shows E13; charger may not recognize that a vehicle is connected.
|
Vehicle Detection / Pilot Duty Cycle Error | View Details |
| E14 |
Charger shows E14 and stops charging; may occur when vehicle requests high current.
|
Current Sensor Calibration / Range Error | View Details |
| E15 |
Display shows E15; charger may not power up fully or may reboot repeatedly.
|
Low-Voltage Power Supply Fault | View Details |
| E16 |
Charger shows E16; smart features may be disabled and charging may be limited or blocked.
|
Network / OCPP Communication Fault (Smart Models) | View Details |
| E17 |
Display shows E17; charger indicates a schedule or authorization error and will not start.
|
User Authorization / RFID Fault (If Equipped) | View Details |
| E18 |
Charger shows E18 and immediately stops when vehicle is connected; may indicate polarity or wiring issue.
|
Line Wiring / Polarity Error | View Details |
| E19 |
Display shows E19; charger may indicate a self-test failure at startup.
|
Self-Test / Internal Safety Relay Test Failure | View Details |
| E2 |
Charger display shows E2 and refuses to start charging when connected to vehicle.
|
Ground Fault / Leakage Current Detected | View Details |
| E20 |
Charger shows E20; may indicate a time or clock synchronization error on smart models.
|
Real-Time Clock / Scheduling Error | View Details |
| E3 |
Display shows E3 and charging stops or will not start.
|
Overvoltage Input Protection Trip | View Details |
| E4 |
Charger shows E4 and does not energize the vehicle; fan may run briefly then stop.
|
Undervoltage / Brownout Protection | View Details |
| E5 |
Display shows E5 and charging stops; unit may feel warm to the touch.
|
Overtemperature Protection – Internal Electronics | View Details |
| E6 |
Charger displays E6 and refuses to start; sometimes occurs immediately when powered up.
|
Relay/Contactor Welded or Stuck | View Details |
| E7 |
Display shows E7; charger may start then immediately stop charging.
|
Output Overcurrent / Short Circuit Protection | View Details |
| E8 |
Charger shows E8 and does not charge; may occur after a surge or lightning event.
|
Internal Communication Error Between Control Board and Power Module | View Details |
| E9 |
Display shows E9; charger will not start charging and may beep or flash LEDs.
|
Ground Continuity / Protective Earth Fault | View Details |
| – |
Charger clicks repeatedly (relay chatter) when a vehicle is connected, but charging does not start.
|
Unstable Contactor Control / Pilot Negotiation Failure | View Details |
| – |
Charger display is on but very dim or flickering; unit may reboot randomly.
|
Unstable Low-Voltage DC Supply | View Details |
| – |
Charger display shows incorrect amperage or energy readings compared to the vehicle or an external meter.
|
Metering / Current Sensing Inaccuracy | View Details |
| – |
Charger emits a strong burning smell or visible smoke during operation.
|
Severe Overheating / Component Failure | View Details |
| – |
Charger fan runs loudly or continuously even when not charging.
|
Cooling Fan Control or Temperature Sensor Drift | View Details |
| – |
Charger has no power at all – display is blank, no LEDs, and no relay click when vehicle is connected.
|
No AC Supply / Internal Fuse or Breaker Open | View Details |
| – |
Charger intermittently trips the home’s GFCI breaker or AFCI breaker, but the charger itself shows no error.
|
Nuisance Tripping Due to Leakage or Inrush | View Details |
| – |
Charger makes a high-pitched whining or buzzing noise during operation.
|
Audible Noise from Power Electronics or Contactor | View Details |
| – |
Charger mounting bracket or housing is loose on the wall; unit may vibrate when plugging in.
|
Mechanical Mounting / Bracket Loosening | View Details |
| – |
Charger or cable becomes excessively hot during normal charging, but no error code appears.
|
High-Resistance Connection / Overheating Conductors | View Details |
| – |
Charger powers on and shows ready, but will not start charging when plugged into any vehicle; no error code displayed.
|
Pilot Signal Not Detected by Vehicle | View Details |
| – |
Charger starts charging but stops after a few minutes without any error code; user must unplug and replug to restart.
|
Intermittent Overtemperature or Ground Fault Trip Without Displayed Code | View Details |
| – |
Charger’s cable insulation is cracked, stiff, or shows signs of UV damage.
|
Aged or Environmentally Damaged Output Cable | View Details |
| – |
Charger’s front panel buttons or touch controls do not respond reliably.
|
Front Panel / Keypad Failure | View Details |
| – |
Charger’s Wi‑Fi or app connection frequently drops, but charging continues.
|
Unstable Wireless Communication | View Details |
| – |
Visible arcing or sparking at the J1772 connector when plugging in or unplugging.
|
Connector Contact Damage / Improper De-Energization | View Details |
| – |
Water or condensation visible inside the charger housing or around the cable entry; charger may behave erratically.
|
Moisture Ingress / Compromised Enclosure Seal | View Details |
No matching codes found
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