Smappee error codes

This page covers the Smappee EV Base, EV Base Charger, EV Wall Business, fourth-generation EV Wall and Smappee DC charging stations. It explains the codes sent to the supervision, the codes shown by the EV Wall V4 and the LEDs.

Where to read the code: in Chargekeeper, charging station list, connector details, Information column (or the active sessions list, Information column). It shows "OCPP code - vendor code - information". See Manufacturer error codes.

How Smappee reports errors

Smappee charging stations do not speak OCPP themselves: the OCPP connection goes through the Smappee cloud, which relays the station state to Chargekeeper.

Faults arrive in the vendor code (vendorErrorCode), as SMP_AC_xxxx for AC stations and SMP_DC_xxxx for DC stations, for example SMP_AC_0100.

On the EV Base and EV Wall Business, the station has no display: every fault shows as the same steady red LED. The vendor code is therefore the only place where the cause can be read.

Smappee's documentation does not say which OCPP error code comes with each SMP_ code. The "OCPP code" column gives the one received from stations supervised by Chargekeeper, when it has been recorded.

AC stations (EV Base, EV Base Charger, EV Wall Business, EV Wall V4) — codes sent to the supervision

Code	Meaning	What to do	OCPP code
`SMP_AC_0001`	Unacceptable leakage current detected by the residual current monitor	Have the station wiring checked by a qualified electrician; contact Smappee support if the fault persists	—
`SMP_AC_0002`	Fault on the positive side of the Control Pilot signal	Contact Smappee support (support@smappee.com)	—
`SMP_AC_0003`	Fault on the Proximity Pilot signal	Contact Smappee support (support@smappee.com)	—
`SMP_AC_0004`	Measured temperature outside the allowed range (too hot or too cold)	Make sure ambient conditions stay within the specified operating range (for example, shade from direct sun)	—
`SMP_AC_0005`	Station disabled by an external command	Re-enable the station from the Smappee Dashboard	—
`SMP_AC_0006`	The socket could not lock the charging cable	Re-insert the cable fully; check that nothing blocks the lock	—
`SMP_AC_0007`	Fault on the negative side of the Control Pilot signal	Contact Smappee support (support@smappee.com)	—
`SMP_AC_0100`	The station lost its internet connection	Check the site's internet connection; check the Smappee Connect LED (see below)	`WeakSignal`
`SMP_AC_0101`	The station detected a faulty energy meter	Check the meter; contact Smappee support	—

Smappee DC stations — codes sent to the supervision

Codes SMP_DC_0003, SMP_DC_0004 and SMP_DC_0008 are warnings.

Code	Meaning	What to do	OCPP code
`SMP_DC_0001`	Charging cable temperature too high	Check ambient conditions; check that the charging cable is not damaged	—
`SMP_DC_0002`	Power inverter temperature too high	Check ambient conditions; check that air inlets and outlets are clear and filters are clean	—
`SMP_DC_0003`	Warning: cable temperature rising, power is reduced automatically	No action: the power reduction limits the temperature rise	—
`SMP_DC_0004`	Warning: inverter temperature rising, power is reduced automatically	No action: the power reduction limits the temperature rise	—
`SMP_DC_0005`	The emergency stop button has been pressed	If the state persists, release the emergency stop button on site	—
`SMP_DC_0006`	The insulation monitor tripped: insulation too low on the DC side	Have all DC wiring checked by a qualified technician	—
`SMP_DC_0007`	The vehicle reported an error	Contact Smappee support for details	—
`SMP_DC_0008`	Warning: one or more power inverters are offline	Have the inverter wiring checked; note the error codes shown on the inverters	—
`SMP_DC_0009`	No communication with the station's communication board	Have the internal wiring checked; contact Smappee support	—
`SMP_DC_0010`	Overvoltage detected	Contact Smappee support	—
`SMP_DC_0100`	The station lost its internet connection	Check the site's internet connection	`WeakSignal`
`SMP_DC_0101`	The station detected a faulty energy meter	Check the meter; contact Smappee support	—
`SMP_DC_0103`	Vehicle authentication timed out	Unplug the cable and start again	—

Other models: EV Wall V4 — codes shown on the display

These codes are shown on the display of the fourth-generation EV Wall (EVW4-332-…). The documentation does not say whether they are also sent over OCPP, nor which SMP_AC_ code they match.

Code	Meaning	What to do	OCPP code
`E01`	Cannot reach a time server (NTP)	Check the network connection and the firewall (port 123)	—
`E02`	No IP address obtained from the network	Check the network connection, DHCP and the firewall	—
`E03`	No connection with the Smappee cloud	Check the network connection and the firewall	—
`E10`	Residual current monitor error; the running session is stopped	Unplug and check the cable and connector for damage; try another cable or vehicle; call a qualified installer if the fault persists	—
`E20`	Negative voltage detected on the Control Pilot line	Unplug and check the cable and connector; try another cable or vehicle; call a qualified installer if the fault persists	—
`E21`	Control Pilot voltage too high	Unplug and check the cable and connector; try another cable or vehicle; call a qualified installer if the fault persists	—
`E22`	The vehicle signalled a fault (Control Pilot state E); charging is stopped for safety	Unplug the vehicle and check the error messages on its dashboard	—
`E30`	Invalid voltage on the Proximity Pilot line	Unplug and check the cable and connector; try another cable or vehicle; call a qualified installer if the fault persists	—
`E40`	RFID reader not detected or not responding	Call a qualified installer or service technician if the fault persists	—
`E41`	MID meter not detected or not responding	Call a qualified installer or service technician if the fault persists	—
`E50`	The charging connector could not be locked; charging is disabled	Re-insert the connector firmly; try another cable	—

LEDs and display

Station LED

On the EV Base, each charging point has its own LED and can show a different state. Faults are not differentiated: they all show as steady red. The EV Wall V4, EV One V4 and EV Dual show their status as text on a display.

Signal	Meaning	What to do
Steady red	Charging point unavailable: fault, station disabled or not activated yet	Check in the app or the Smappee Dashboard whether the station is disabled, and re-enable it; read the vendor code (`SMP_AC_xxxx`) to find the cause; on the EV Base, check that both sides are powered (circuit breakers and RCD on); contact the installer or Smappee support if the LED stays red
Flashing red	RFID badge refused during authorisation	Check the badge authorisation in the supervision; the driver should contact their card supplier
Steady white	Charging point available	No action: the driver can plug in
Steady blue	Vehicle plugged in, session not yet authorised	Present the RFID badge, scan the QR code or use the Pay Station; if no authorisation is required, the LED should turn green within about 3 seconds: if it stays blue, check the station configuration
Flashing blue	RFID badge authorisation in progress	Wait up to about 15 seconds: the LED turns red (refused or not started) or green (started)
Pulsing green	Vehicle charging	No action
Flashing green	Session waiting or paused by Smappee (overload protection, smart charging)	No action, information only; if frequent, check the grid maximum current setting and the site measurements
Steady green	The station allows current but the vehicle is not drawing it: charge complete, stopped by the vehicle or session paused	Check the session status in the app or the Smappee Dashboard (paused or charging ended); if charging ended while the battery is not full, check the vehicle's charge settings or errors
Steady or pulsing green alternating, with clicking	The session keeps starting and stopping	Have the installer check and reset the internal RCD, and call them back if it trips again; have a qualified electrician check the wiring, the phase-neutral and neutral-earth voltages and the earth resistance
Off	The station has no power	Check the station's circuit breaker; have the installer check the internal RCD, and call them back if it trips again

Smappee Connect LED

The Smappee Connect is the internet gateway mounted inside the station; its LED is only visible with the station open (installer). Because OCPP goes through the Smappee cloud, a Connect without internet also makes the station offline for the supervision.

Signal	Meaning	What to do
Flashing red	The Connect has no internet access: the station is offline for the cloud and for the supervision	Check the network cable, the switch port and internet access; check the firewall rules; contact Smappee support if the problem persists
Steady green	The Connect is on the local network but has not reached the Smappee servers yet	Wait up to 2 minutes; then check the firewall and contact support
Steady blue	The Connect is booting	If it lasts longer than about 30 seconds, contact support
Flashing blue	The Connect is in install mode, waiting to be connected to the network (with Ethernet: no cable detected or Ethernet mode not enabled)	Complete the activation in the Smappee app; for Ethernet, enable Ethernet mode in the app and check the cable
Breathing green	The Connect is working normally	No action

Smappee 4G Connect LED

On the 4G Connect, the LED shows 4G reception, not the cloud status: red means a weak or missing 4G signal.

Signal	Meaning	What to do
Flashing red	No 4G reception or no internet access	Check the SIM card status and 4G coverage; move the 4G Connect or switch to a wired connection; contact support if the problem persists
Breathing red	Poor 4G reception at the installation position	Move the 4G Connect to a better spot or use another connection method
Breathing yellow	Average 4G reception; some functions may be slow	Consider moving the 4G Connect
Flashing cyan	The 4G Connect is searching for a network	Wait; if it persists, check the SIM card status and coverage

Sources

OCPP 1.6 – User manual (Smappee EV Line), version 1.9.1, March 2025 — https://www.smappee.com/eu/files/technical_documentation_ev-line-ocpp-manual
Smappee EV Line – OCPP manual, version 1.6, August 2023 — https://support.smappee.com/hc/en-gb/article_attachments/48209666958996
Smappee EV Base – Installation manual, version 3.03.5, August 2025 — https://www.smappee.com/technical_documentation_installation-manual_ev-base-v3_en/
Smappee EV Base – Installation manual (EV Base Charger, EVBC), version 1.3.1, July 2026 — https://www.smappee.com/eu/files/technical_documentation-installation-manual_ev-base
Smappee EV Wall Business – Installation manual, version 1.7, February 2023 — https://www.smappee.com/technical_documentation-installation-manual_ev-wall-business-v2_en/
Smappee EV Wall – Install and Operate Guide, version 4.0, May 2026 — https://www.smappee.com/eu/files/technical_documentation-installation-manual_ev-wall
Smappee Help Center – What do the LED colours of my charging station mean? (article 4404724890644) — https://support.smappee.com/hc/en-gb/articles/4404724890644-What-do-the-LED-colours-of-my-charging-station-mean
Smappee Help Center – The car does not start charging (article 4418364942100) — https://support.smappee.com/hc/en-gb/articles/4418364942100-The-car-does-not-start-charging
Smappee Help Center – Not all the EV Line components are being detected (article 4418452081940) — https://support.smappee.com/hc/en-gb/articles/4418452081940-Not-all-the-EV-Line-components-are-being-detected
Smappee Help Center – What do the colours of my Smappee LED tell me? (article 360040588872) — https://support.smappee.com/hc/en-gb/articles/360040588872-What-do-the-colours-of-my-Smappee-LED-tell-me