When a VOOL charger runs into a problem it records a status code. You will see it in the VOOL app, in the portal under the charger’s health status, or quoted back to you by support. This page lists the codes a charger can report, what each one means, and whether charging keeps running.
Two things before you start. Almost every code clears by itself once the cause is gone — there is nothing to acknowledge. And these numbers are not the numbers 01–11 printed in the charger’s user manual: that is a separate, older list, and both are kept side by side in Troubleshooting VOOL charger: error codes.
Supply voltage
These codes are about the mains voltage reaching the charger. The exact trigger levels are set per installation, so the same grid can produce a warning at one site and nothing at another. Codes 13–16 stop charging; 17, 18 and 20–25 do not.
13 — “Voltage too high L1”. Voltage on phase 1 is above the range the charger will operate in. Charging stops and will not restart while the code is active. This is a supply-side problem, not a charger fault. Have an electrician measure the voltage at the charger; if it is the grid, your network operator has to fix it.
14 — “Voltage too high L2”. Voltage on phase 2 is above the range the charger will operate in. Charging stops and will not restart while the code is active. This is a supply-side problem, not a charger fault. Have an electrician measure the voltage at the charger; if it is the grid, your network operator has to fix it.
15 — “Voltage too high L3”. Voltage on phase 3 is above the range the charger will operate in. Charging stops and will not restart while the code is active. This is a supply-side problem, not a charger fault. Have an electrician measure the voltage at the charger; if it is the grid, your network operator has to fix it.
16 — “Voltage too low L1”. Voltage on phase 1 is below the range the charger will operate in. Charging stops and will not restart while the code is active. Check that every fuse and breaker feeding the charger is on. If they are, this is a supply problem rather than a charger fault — have an electrician measure the voltage at the charger, and if the grid is the cause, your network operator has to fix it.
17 — “Voltage too low L2”. Voltage on phase 2 is below the range the charger will operate in. Charging continues. Check the fuses and breakers on that phase. If the voltage stays low, have an electrician measure it.
18 — “Voltage too low L3”. Voltage on phase 3 is below the range the charger will operate in. Charging continues. Check the fuses and breakers on that phase. If the voltage stays low, have an electrician measure it.
20 — “Voltage high warning L1”. Voltage on phase 1 is unusually high but still inside the operating range. Charging continues. Nothing to do unless it keeps appearing. If it does, have an electrician look at the installation.
21 — “Voltage high warning L2”. Voltage on phase 2 is unusually high but still inside the operating range. Charging continues. Nothing to do unless it keeps appearing. If it does, have an electrician look at the installation.
22 — “Voltage high warning L3”. Voltage on phase 3 is unusually high but still inside the operating range. Charging continues. Nothing to do unless it keeps appearing. If it does, have an electrician look at the installation.
23 — “Voltage low warning L1”. Voltage on phase 1 is unusually low but still inside the operating range. Charging continues. Often appears when something heavy on the same phase switches on. If it appears with no obvious cause, have an electrician check the installation.
24 — “Voltage low warning L2”. Voltage on phase 2 is unusually low but still inside the operating range. Charging continues. Often appears when something heavy on the same phase switches on. If it appears with no obvious cause, have an electrician check the installation.
25 — “Voltage low warning L3”. Voltage on phase 3 is unusually low but still inside the operating range. Charging continues. Often appears when something heavy on the same phase switches on. If it appears with no obvious cause, have an electrician check the installation.
Communication
The charger is made of several parts that talk to each other, and it also talks to a load management controller and to power meters. These codes say which link went quiet.
2 — “Load management comm fault”. Load management is switched on for this charger, but the charger cannot reach the controller. Charging stops after a short delay. Check that the LMC has power and is online, and that the charger is still attached to it. See re-attaching a charger to the LMC and checking the CAN link.
3 — “Front panel comm error”. The charger's main controller has lost contact with the front panel — the part with the light ring and the RFID reader. Charging is not affected, but the light ring and the card reader may not respond. Switch the charger off at the main switch, wait ten seconds and switch it back on. If the code returns, contact [email protected].
4 — “Internal comm error, GW”. The main controller and the communication module inside the charger are not talking to each other reliably. Charging continues. Restart the charger from the main switch. If the code keeps coming back, contact [email protected].
9 — “Advanced interface card comm error”. The charger cannot reach the advanced interface card fitted to it. Charging stops and will not restart while the code is active. Contact [email protected]. Requires charger software 2.12.2 or newer to appear.
34 — “RTC communication lost”. The charger's real-time clock stopped answering. Charging continues. Usually clears by itself. If it stays, contact [email protected].
200 — “Internal powermeter comm lost”. The charger's built-in energy meter is not answering, so the charger cannot measure what it is delivering. Charging stops and will not restart while the code is active. Contact [email protected].
201 — “Internal powermeter comm warning”. Occasional dropped messages to the built-in energy meter. Charging continues. Nothing to do. If it becomes constant it usually turns into code 200.
202 — “External powermeter comm lost”. The separate energy meter used for load management or billing is not answering. Charging stops and will not restart while the code is active. Check the meter's wiring and power. If it is a load-management meter, also check the LMC. Otherwise contact [email protected].
203 — “External powermeter comm warning”. Occasional dropped messages to the external energy meter. Charging continues. Nothing to do. If it becomes constant it usually turns into code 202.
Residual current protection
The charger has its own residual current sensor in addition to the RCD in your fuse box. These are safety codes and the charger is deliberately strict about them.
101 — “RCD sensor fault”. The residual current sensor reports a fault, or its self-test failed. Charging stops and will not restart while the code is active. The charger will not charge without working residual current protection. Contact [email protected].
102 — “DC current leakage”. The sensor detected direct-current leakage in the charging circuit. Charging stops immediately and the charger stays out of service until the cause is gone. Unplug the cable and plug it in again. If it happens again, stop using that cable and try another one; if it still happens, stop using the charger and contact [email protected].
103 — “AC current leakage”. The sensor detected alternating-current leakage in the charging circuit. Charging stops immediately and the charger stays out of service until the cause is gone. Unplug the cable and plug it in again. If it happens again, stop using that cable and try another one; if it still happens, stop using the charger and contact [email protected].
Cable, connector and vehicle
These come from the signal wires in the Type 2 connector — CP is the line the car and charger use to negotiate, PP tells the charger how much current the cable is rated for. The CP checks were renumbered out of the 300s and into the 150s. A charger on older software reports the same check under its old 30x number and it means exactly the same thing, so both numbers are given below.
150, older software 300 — “CP diode fault detected”. The charger checks a diode in the vehicle's charging circuit and did not find it behaving correctly. Charging stops immediately. Try a different cable, and if you can, a different vehicle. If the fault follows the cable, replace the cable; if it follows the car, it is a vehicle-side fault. Requires charger software 2.12.4 or newer to appear.
151, older software 301 — “CP positive voltage high”. The 12 V level on the CP line has risen above 12.7 V. Charging stops immediately. Restart the charger from the main switch, and try another cable if you have one. If the code returns, contact [email protected]. Requires charger software 2.12.4 or newer to appear.
155, older software 305 — “Invalid CP signal voltage warning”. A brief reading on the CP line that matches no standard state. Charging continues. Nothing to do about the code itself. When it appears alongside a low-voltage code, deal with the voltage first — that is almost always the real fault.
156, older software 306 — “Invalid CP signal voltage”. The same reading as 155, but it did not go away. Charging stops and will not restart while the code is active. Unplug at both ends and plug in again, pushing the plug fully home. If it repeats, try another cable; if it still repeats, contact [email protected].
36 — “Invalid PP signal voltage”. A brief reading on the cable-rating line that matches no standard value. Charging continues. Push the plug fully into the socket. If it repeats, the cable or the socket contacts may be dirty or worn. Requires charger software 2.12.2 or newer to appear.
104 — “Socket locking fault”. The motorised lock that holds the plug in the socket did not reach the position it was asked for. Charging stops immediately and the charger stays out of service until the cause is gone. Make sure the cable is not pulled tight or hanging with its weight on the plug, push the plug deeper in and try again. If it repeats, the plug or the lock needs to be looked at — contact [email protected].
28 — “Current not zero”. The charger measured current flowing while its relays were open, which should be impossible. Charging stops and will not restart while the code is active. Restart the charger from the main switch. If the code returns, stop using the charger and contact [email protected].
Temperature
Both of these appear as “Internal temperature high”, so the code number is the only thing that tells you which one you have.
30 — “Internal temperature high”. The charger has reached 80 °C inside. Clears again at 75 °C. Charging continues, though it may slow down. Nothing to do — but if it happens on mild days, check that the charger is not in direct sun and that nothing is blocking it.
31 — “Internal temperature high”. The charger has reached 90 °C inside and will not charge. Clears again at 80 °C. Let the charger cool down; charging resumes on its own. If it reaches this on a normal day, shade or ventilation is the fix, and it is worth having the installation checked.
Local inputs
Some installations wire an external switch into the charger — an emergency stop button, or a signal that pauses charging.
32 — “Emergency stop activated”. The charger's emergency stop input was triggered. Charging stops immediately and the charger stays out of service until the cause is gone. Find out why the emergency stop was triggered and release it. Charging resumes about ten seconds after the input is cleared. Requires charger software 2.11.0 or newer.
33 — “Charging locally paused”. The charger's pause input was triggered — for example by a building system that wants the load off for a while. Nothing is broken, and charging continues when the input is released. Requires charger software 2.11.0 or newer.
Charger internals
These are about the charger's own hardware and software rather than anything you can see. The last two need us — they do not clear on their own.
199 — “Power measurement system error”. The charger's check on power-loss detection did not give a plausible result after charging started. Charging continues. Nothing to do — it clears itself about five minutes later. If charging actually stopped, the cause is a different code. Requires charger software 2.12.2 or newer.
35 — “RTC configuration invalid”. The real-time clock did not configure correctly when the charger started up. Charging continues. Restart the charger from the main switch. If it returns, contact [email protected].
5 — “MCU process overload”. The controller's timed tasks ran slightly over their budget. Charging continues. Nothing to do. Worth mentioning to support only if it appears constantly.
6 — “MCU process overload”. The controller's timed tasks ran well over their budget. Charging continues. Nothing to do, but tell us if you see it — contact [email protected].
7 — “Hardware version fault”. The software found a hardware version it does not support. The charger will not operate at all. This one cannot clear by itself and a restart will not help. Contact [email protected].
8 — “Incompatible FW versions”. The two pieces of software inside the charger are versions that do not work together. The charger will not operate at all. This one cannot clear by itself and a restart will not help. It is fixed by pushing the right software to the charger — contact [email protected].
What the severity words mean
Every code carries a severity, and that is what decides whether charging stops. From mildest to most serious: a warning is recorded but changes nothing; reduced power lowers the charging current; block new sessions lets the current session finish but refuses the next one; a delayed stop ends charging after a short grace period; a normal stop ends it; a fast stop ends it immediately; an emergency stop ends it immediately and keeps the charger out of service until the cause is gone; and a critical failure means the charger will not operate until someone fixes it.
If your code is not here
A handful of codes exist only for our engineers and are not listed above. If the code you are looking at is not on this page, send it to [email protected] with the charger’s name and roughly when it appeared, and we will tell you what it was.
This list is current as of September 2026 and applies to the 22 kW VOOL charger. It includes the renumbering of the CP codes out of the 300s and into the 150s. Where a code needs a particular charger software version, that is noted with it.