myenergi zappi PE Fault
Code 25. myenergi say the earth is either disconnected or its impedance is too high — a problem in the installation rather than in the charger.
Stop — this needs an engineer
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What this means
PE Fault is code 25 and myenergi describe it as a problem with the main earth connection to the unit, with a precise statement of what that means: the earth is either disconnected or the impedance of the earth connection is too high. That is not a fault inside the charger. It is the charger measuring the earth path it depends on and finding it inadequate, and refusing to charge as a result. This matters more on a chargepoint than on almost any other appliance in a house, because of what the earth is protecting.
A car on a driveway is a large conductive object that a person stands next to, in the rain, holding a cable. The whole protective scheme depends on there being a low-impedance path to earth so that a fault causes a protective device to operate rather than energising the car body. A charger that has detected a poor earth and stopped is doing precisely what it should, and it is one of the few faults in this category where the right response is to leave it alone until somebody qualified has looked at it. myenergi's published action is to unplug the EV, check the earth connection to the zappi, and hold the button to reset.
That check is an electrician's job rather than an owner's, because it means opening a permanently connected mains enclosure — and myenergi's own safety wording covers exactly that: always disconnect the device from the supply before removing the cover, and everyone involved in commissioning, maintaining and servicing must be suitably qualified. They add one specific case worth mentioning to whoever attends: if the supply is IT earthed, check the Supply Grid and Earthing menu setting. That is unusual in a British home but it exists, and a charger configured for the wrong earthing arrangement will report a fault that is really a setting.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Earth impedance too high | The connection exists but is not good enough. Corrosion, a loose terminal, or an earth rod in dry ground can all raise impedance beyond what the unit accepts. | Common |
| The earth connection has been disconnected | myenergi’s first stated case. Often follows work on the consumer unit or on the charger circuit, and it may not have been noticed at the time. | Occasional |
| A wrong earthing configuration setting | myenergi name this specifically — on an IT earthed supply, the Supply Grid and Earthing menu setting needs checking. A charger set for the wrong arrangement reports a fault that is really a configuration. | Occasional |
| A problem with the incoming supply earth | The most serious version, and the one that is not yours or the installer’s. If the earth arriving at the property is compromised, that is a distribution network operator matter. | Occasional |
Can you fix it yourself?
Stop — this needs an engineer
What it costs to fix
Typical repair cost
£80–£260
Time on site
1h 30m
An electrician’s visit to test and correct the earth. A loose or corroded terminal is at the low end; work involving the supply earth or a new earthing arrangement sits well above it.
Typical UK prices including parts and labour, updated September 2026. Your quote may differ.
Own this appliance and had this code? . Nothing is published until a person has read it.
Related myenergi zappi fault codes
- PEN FaultStop — call an engineerCode 29. The protection against loss of the supply earth-neutral conductor has operated, and myenergi tell you to remove the fault before resetting.Related: earth and supply protection
- Bad Voltage RangeGet it checkedCode 31, shown with Over Voltage or Under Voltage. The mains supply is outside the range the zappi will charge on, so it has disconnected the car. The fault is upstream of the charger.Related: earth and supply protection
- SelfTest FailedGet it checkedCode 27, searched as A27. The built-in protection devices could not be tested, or failed the test, before a charge. myenergi’s action is a reset; they do not say it cannot be repaired.Related: same brand
- Charge BlockedUsually simple to fixNot a fault. The car keeps asking to charge after it already reported complete, and the zappi has stopped answering.Related: same brand
- Lock FailureGet it checkedCode 23, and the fix is counter-intuitive: push the plug further in to release it. Untethered zappis only.Related: same brand
- OverheatingGet it checkedTwo stages, both published: wavy lines over the zappi icon mean thermal limiting with reduced output, and the Overheating! message means the output is off. Ventilation is the remedy and charging resumes on its own.Related: same brand
Own a myenergi zappi ev charger? Save it and its codes come first next time.
Related guides
Common questions
Can I reset it and carry on?
myenergi’s published action includes checking the earth connection before resetting, and that check is the important half. Resetting past an earth fault leaves you charging a car on a driveway with a protective path the unit has already judged inadequate, which is exactly the situation the detection exists to prevent.
Is this the charger or my house?
Almost always the installation rather than the unit. myenergi describe the fault as the earth being disconnected or its impedance being too high, both of which are properties of the wiring and the supply. The person to call is the electrician who installed the charger, or another qualified electrician if that is not possible.
What is the earthing setting they mention?
On supplies with an unusual earthing arrangement — myenergi name IT earthing specifically — the zappi has a Supply Grid and Earthing menu setting that has to match. A unit configured for the wrong arrangement will report an earth fault that is really a mismatch, so it is worth mentioning to whoever attends.
Is it safe to use the car normally?
Yes. The fault is in the charging installation, not in the vehicle, and the charger has isolated itself. You can drive and charge elsewhere while you get the installation looked at.
Technical review
Not reviewed by an engineer
No engineer has read this page. Severity follows what the manufacturer publishes, and we would rather tell you that than let a byline imply a sign-off.
Sources and how we verified this
We establish the facts from the sources below and then write the explanation ourselves. We do not copy manufacturer wording and we do not host their manuals.
- Manufacturer technical and service documentation
This page has not been reviewed by an engineer, and we would rather tell you that than imply otherwise. The severity rating follows what the manufacturer publishes: where they say isolate the appliance and call someone, so do we.