FLO
FLO 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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E01
Charger will not start charging; vehicle shows ‘Charging Error’ and FLO app displays E01.
Pilot Signal Communication Fault
E02
Charger refuses to start; FLO app or LED pattern indicates E02 ground fault / GFCI trip.
Ground Fault / Leakage Current Detected
E03
Charger shows E03 / ‘Overcurrent’ and stops charging shortly after starting.
Output Overcurrent Protection Trip
E04
Charger displays E04 / ‘Overvoltage’ and will not start charging.
AC Line Overvoltage Protection
E05
Charger shows E05 / ‘Undervoltage’ and refuses to charge or stops mid-session.
AC Line Undervoltage / Brownout Detection
E06
Charger indicates E06 / ‘Ground Missing’ or ‘Ground Fault – No Reference’ and will not charge.
Protective Earth (Ground) Detection Failure
E07
Charger shows E07 / ‘Relay Welded’ or ‘Contactor Fault’ and refuses to start charging.
Stuck or Welded Power Contactor
E08
Charger displays E08 / ‘Overtemperature’ and stops or refuses to start charging, especially on hot days.
Internal Overtemperature Protection Trip
E09
Charger shows E09 / ‘Pilot Short’ and will not initiate charging.
Pilot Signal Short to Ground or Power
E10
Charger displays E10 / ‘Proximity Fault’ and does not latch into charging state.
Proximity Pilot (PP) Circuit Fault
E11
Charger shows E11 / ‘Internal Communication Error’ and is unresponsive to start commands.
Internal Control Board Communication Failure
E12
Charger indicates E12 / ‘RTC Error’ or ‘Clock Failure’ and may have issues with scheduled charging.
Real-Time Clock (RTC) or Timekeeping Failure
E13
Charger shows E13 / ‘Meter Error’ or ‘Energy Measurement Fault’; charging may be disabled or unmetered.
Internal Energy Meter Communication or Calibration Fault
E14
Charger displays E14 / ‘Isolation Fault’ and refuses to charge.
Insulation / Isolation Resistance Fault on Output
E15
Charger shows E15 / ‘Lock Fault’ on units with connector holster lock; connector may be stuck or not lock.
Connector Locking Mechanism Failure
E16
Charger indicates E16 / ‘Wi-Fi Error’ or ‘Network Module Fault’; remote monitoring and app control fail.
Wi-Fi / Network Module Communication Failure
E17
Charger shows E17 / ‘Configuration Error’; may not deliver expected current or may refuse to start.
Configuration / Parameter Corruption
E18
Charger displays E18 / ‘Contactor Feedback Error’; unit may click but not start charging.
Contactor Feedback / Position Sensing Fault
E19
Charger shows E19 / ‘Firmware Mismatch’ or ‘Module Version Error’.
Incompatible Firmware Between Modules
E20
Charger indicates E20 / ‘EVSE Self-Test Failed’ at startup and will not charge.
Self-Test Failure of Safety Circuits
Symptom
Charger enclosure is warm or hot to the touch even when not charging.
Standby Power Dissipation / Internal Component Overheating
Symptom
Charger has no power at all; LEDs are off and it does not respond to the app.
No AC Supply / Input Power Loss
Symptom
Charger intermittently trips a GFCI or AFCI breaker in the home panel.
Nuisance Ground-Fault or Arc-Fault Tripping
Symptom
Charger makes loud clicking, buzzing, or humming noises during operation.
Abnormal Contactor or Transformer Noise
Symptom
Charger powers on but will not start charging; vehicle shows ‘Not Charging’ and no error code is displayed.
Charge Session Not Initiating
Symptom
Charger starts charging but stops after a few minutes without any visible error code; LEDs may show idle state.
Intermittent Charging / Session Dropout
Symptom
Charger trips the house breaker immediately when a charging session starts.
Short Circuit or Severe Overcurrent on Start
Symptom
Charger’s cable is difficult to unwind or rewind; insulation feels stiff, especially in cold weather.
Cable Flexibility / Mechanical Wear Issue
Symptom
Charger’s cable or connector becomes very hot during charging; plastic may discolor or smell.
Overheating Connector / High Contact Resistance
Symptom
Charger’s energy usage reported in the FLO app seems inaccurate compared to the home’s utility meter.
Energy Measurement Inaccuracy
Symptom
Charger’s front cover or enclosure is loose, rattling, or not sealing properly.
Mechanical Enclosure Integrity Issue
Symptom
Charger’s front LEDs do not match the status shown in the FLO app (e.g., app says charging but LEDs show idle).
Status Indication / LED Driver Fault
Symptom
Charger’s front LEDs flash in an unusual pattern and the unit beeps, but no code is shown in the app.
Non-Coded Fault Indication / LED-Only Diagnostic
Symptom
Charger’s RFID reader does not detect cards or fobs, preventing session start on access-controlled units.
RFID Reader Failure
Symptom
Charger’s scheduled charging does not start at the programmed time, even though the unit is online.
Scheduling / Timer Malfunction
Symptom
Charger’s Wi-Fi signal is weak or frequently disconnects, causing unreliable app control.
Poor Wireless Connectivity
Symptom
Water or condensation visible inside the charger enclosure or around cable entry.
Water Ingress / Seal Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Charger will not start charging; vehicle shows ‘Charging Error’ and FLO app displays E01.
|
Pilot Signal Communication Fault | View Details |
| E02 |
Charger refuses to start; FLO app or LED pattern indicates E02 ground fault / GFCI trip.
|
Ground Fault / Leakage Current Detected | View Details |
| E03 |
Charger shows E03 / ‘Overcurrent’ and stops charging shortly after starting.
|
Output Overcurrent Protection Trip | View Details |
| E04 |
Charger displays E04 / ‘Overvoltage’ and will not start charging.
|
AC Line Overvoltage Protection | View Details |
| E05 |
Charger shows E05 / ‘Undervoltage’ and refuses to charge or stops mid-session.
|
AC Line Undervoltage / Brownout Detection | View Details |
| E06 |
Charger indicates E06 / ‘Ground Missing’ or ‘Ground Fault – No Reference’ and will not charge.
|
Protective Earth (Ground) Detection Failure | View Details |
| E07 |
Charger shows E07 / ‘Relay Welded’ or ‘Contactor Fault’ and refuses to start charging.
|
Stuck or Welded Power Contactor | View Details |
| E08 |
Charger displays E08 / ‘Overtemperature’ and stops or refuses to start charging, especially on hot days.
|
Internal Overtemperature Protection Trip | View Details |
| E09 |
Charger shows E09 / ‘Pilot Short’ and will not initiate charging.
|
Pilot Signal Short to Ground or Power | View Details |
| E10 |
Charger displays E10 / ‘Proximity Fault’ and does not latch into charging state.
|
Proximity Pilot (PP) Circuit Fault | View Details |
| E11 |
Charger shows E11 / ‘Internal Communication Error’ and is unresponsive to start commands.
|
Internal Control Board Communication Failure | View Details |
| E12 |
Charger indicates E12 / ‘RTC Error’ or ‘Clock Failure’ and may have issues with scheduled charging.
|
Real-Time Clock (RTC) or Timekeeping Failure | View Details |
| E13 |
Charger shows E13 / ‘Meter Error’ or ‘Energy Measurement Fault’; charging may be disabled or unmetered.
|
Internal Energy Meter Communication or Calibration Fault | View Details |
| E14 |
Charger displays E14 / ‘Isolation Fault’ and refuses to charge.
|
Insulation / Isolation Resistance Fault on Output | View Details |
| E15 |
Charger shows E15 / ‘Lock Fault’ on units with connector holster lock; connector may be stuck or not lock.
|
Connector Locking Mechanism Failure | View Details |
| E16 |
Charger indicates E16 / ‘Wi-Fi Error’ or ‘Network Module Fault’; remote monitoring and app control fail.
|
Wi-Fi / Network Module Communication Failure | View Details |
| E17 |
Charger shows E17 / ‘Configuration Error’; may not deliver expected current or may refuse to start.
|
Configuration / Parameter Corruption | View Details |
| E18 |
Charger displays E18 / ‘Contactor Feedback Error’; unit may click but not start charging.
|
Contactor Feedback / Position Sensing Fault | View Details |
| E19 |
Charger shows E19 / ‘Firmware Mismatch’ or ‘Module Version Error’.
|
Incompatible Firmware Between Modules | View Details |
| E20 |
Charger indicates E20 / ‘EVSE Self-Test Failed’ at startup and will not charge.
|
Self-Test Failure of Safety Circuits | View Details |
| – |
Charger enclosure is warm or hot to the touch even when not charging.
|
Standby Power Dissipation / Internal Component Overheating | View Details |
| – |
Charger has no power at all; LEDs are off and it does not respond to the app.
|
No AC Supply / Input Power Loss | View Details |
| – |
Charger intermittently trips a GFCI or AFCI breaker in the home panel.
|
Nuisance Ground-Fault or Arc-Fault Tripping | View Details |
| – |
Charger makes loud clicking, buzzing, or humming noises during operation.
|
Abnormal Contactor or Transformer Noise | View Details |
| – |
Charger powers on but will not start charging; vehicle shows ‘Not Charging’ and no error code is displayed.
|
Charge Session Not Initiating | View Details |
| – |
Charger starts charging but stops after a few minutes without any visible error code; LEDs may show idle state.
|
Intermittent Charging / Session Dropout | View Details |
| – |
Charger trips the house breaker immediately when a charging session starts.
|
Short Circuit or Severe Overcurrent on Start | View Details |
| – |
Charger’s cable is difficult to unwind or rewind; insulation feels stiff, especially in cold weather.
|
Cable Flexibility / Mechanical Wear Issue | View Details |
| – |
Charger’s cable or connector becomes very hot during charging; plastic may discolor or smell.
|
Overheating Connector / High Contact Resistance | View Details |
| – |
Charger’s energy usage reported in the FLO app seems inaccurate compared to the home’s utility meter.
|
Energy Measurement Inaccuracy | View Details |
| – |
Charger’s front cover or enclosure is loose, rattling, or not sealing properly.
|
Mechanical Enclosure Integrity Issue | View Details |
| – |
Charger’s front LEDs do not match the status shown in the FLO app (e.g., app says charging but LEDs show idle).
|
Status Indication / LED Driver Fault | View Details |
| – |
Charger’s front LEDs flash in an unusual pattern and the unit beeps, but no code is shown in the app.
|
Non-Coded Fault Indication / LED-Only Diagnostic | View Details |
| – |
Charger’s RFID reader does not detect cards or fobs, preventing session start on access-controlled units.
|
RFID Reader Failure | View Details |
| – |
Charger’s scheduled charging does not start at the programmed time, even though the unit is online.
|
Scheduling / Timer Malfunction | View Details |
| – |
Charger’s Wi-Fi signal is weak or frequently disconnects, causing unreliable app control.
|
Poor Wireless Connectivity | View Details |
| – |
Water or condensation visible inside the charger enclosure or around cable entry.
|
Water Ingress / Seal Failure | View Details |
No matching codes found
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