Home EV charger: live demo
healthy Pulse 59820324 · 2026-11-13T22:42:22Z · Monitoring only
A 7.4 kW home wallbox and the cars that use it. When a car charges shows when people are home, so every session stays private; HEART changes nothing. HEART runs on the charger's communication board, beside its certified safety controller and never in it.
Next in its story: system.main-function-lost in about 2 minutes.
What HEART Hub receives
Only the public Pulse and public alerts: the status and fault codes. Nothing else ever leaves the device.
| Status | healthy | public | |
| Charger | in-service | public |
What stays on the device
The owner or clinic sees these locally with a key. They are never reported.
| Grid voltage | 231.9 V | internal | |
| RCD | ok | internal | |
| Contactor | ok | internal | |
| Network link | up | internal | |
| Connector | charging | private | |
| Charging current | 31.5 A | private | |
| Connector temperature | 42.3 Cel | private |
Alerts in the last hour
| Fault code | Severity | Status | Raised (UTC) | What HEART says |
|---|---|---|---|---|
system.main-function-lostThe system cannot do its main job. Every HEART MUST be able to detect this. | critical | resolved 22:37:42 | 22:36:05 | The contactor does not close: the car cannot charge. The car asked for charge and the controller closed the contactor, but it stayed open: no current flows. A burnt coil or a failed relay driver is likely. Call the installer. |
actuators.not-respondingA motor, valve or similar part does not react to commands. | error | resolved 22:37:42 | 22:36:05 | The contactor does not follow its command. Command closed, mirror contact open (not-closing). The charger's own protection handles it; this is for the installer. |
system.main-function-lostThe system cannot do its main job. Every HEART MUST be able to detect this. | critical | resolved 22:31:00 | 22:29:05 | The residual current device has tripped: charging is stopped. Earth-leakage protection tripped. The charger is safe and will stay off. A qualified person must inspect the car and cable and reset it at the charger. HEART never resets it, and nothing can do so remotely. |
connectivity.link-lostA network link is down. | warning | resolved 22:25:00 | 22:22:05 | The charger cannot reach its backend. The charger's network link is down: its backend (over OCPP) and HEART Hub cannot be reached. Charging carries on locally. |
power.supply-lostMain power is gone. Running on battery or backup, if any. | error | resolved 22:18:00 | 22:17:05 | Grid supply is lost. No grid voltage at the charger. Check the circuit breaker and whether there is a power cut. HEART reports this on its small backup supply. |
power.supply-unstableVoltage or supply is outside the normal range. | warning | resolved 22:17:00 | 22:16:05 | Grid voltage is outside its normal range. Voltage outside 207 to 253 V. The charger pauses itself below 195 V or above 260 V. If it happens often, tell the electricity network operator. |
performance.too-hotThe device is overheating and may slow itself down. | warning | resolved 22:12:00 | 22:08:05 | The connector is too hot: charging current is reduced. Connector at 74 °C (derates above 70 °C, stops at 90 °C): the charger has cut the current to 16 A. A worn or dirty connector pin is the usual cause. Have it inspected. |
sensors.stuckA reading has not changed when it should have. | error | resolved 22:05:18 | 22:03:05 | The energy meter has stopped counting. Current is flowing (32 A), but the energy register has not moved for 60 s. Charging is safe, but billing and energy records are wrong until the meter is fixed. |
system.main-function-lostThe system cannot do its main job. Every HEART MUST be able to detect this. | critical | resolved 21:46:00 | 21:44:05 | The contactor is welded: the charger has locked itself out. The contactor stayed closed after the car left (its mirror contact reads closed, command open). The charger has isolated itself and refuses to charge. Call the installer: the contactor must be replaced. |
actuators.not-respondingA motor, valve or similar part does not react to commands. | error | resolved 21:46:00 | 21:44:05 | The contactor does not follow its command. Command open, mirror contact closed (welded). The charger's own protection handles it; this is for the installer. |
Now do it for your own device and monitor it here: https://heartcortex.ai/monitor. Start from a template, follow the HEART specifications, then register your device with its claim code.
What is inside: the code, how it works, and the specifications it follows · All demo devices
A demonstration that replays a one-hour story. Refreshes every 10 seconds.