HEART system.main-function-lost H-01001

Main function lost. The system cannot do its main job. Every HEART MUST be able to detect this.

Likely causes

• A part the main job depends on has failed: a burner that will not light, a camera that does not answer, a pump that has tripped.
• A safety device has stopped the job on purpose: a thermal-runaway cut-out on a 3D printer, an RCD trip on an EV charger, a dry-run lock-out on a pump.
• A consumable has run out: filament, water in a tank, paper, space on a memory card.
• Power to the part that does the work is gone, while the controller still runs on a battery or UPS.
• Every worker or service that serves customers is stuck or down, as on a web shop where no order can be taken.

How to fix or prevent it

1. Read the alert's explanation and cause: they say which part stopped and why, often with a second fault code.
2. If a safety device tripped, find the reason before you reset it. Never bypass a cut-out to get the job running again.
3. Refill or replace what ran out (filament, water, paper, card), then resume the job.
4. Check power and fuses to the working part, and look for messages from the product's own controller or display.
5. Restart the product only if its manual says that is safe. If the job stops again, stop and call service.
6. To prevent it: follow the maintenance schedule, and act on earlier warnings such as system.main-function-degraded, power.battery-low or storage.nearly-full.

What the HEART does by itself

Every HEART must notice this (Autonomy Level A1). It raises a critical alert, sets its status to failing, and tells a person through the owner's escalation route at once. A Playbook may try one safe step that the product allows, such as restarting a stuck software worker, but a HEART never resets a safety device or works around an interlock. The alert resolves by itself when the main job works again.

When to call service

At once if a safety device tripped (a thermal cut-out, an earth-leak trip, a welded contactor), if anything smells hot or looks damaged, or if the job stops again after one restart. For medical or life-safety products, follow the product's own emergency instructions first.

Related codes

• system.main-function-degraded H-01002: Main function degraded
• actuators.not-responding H-09001: Actuator not responding
• power.supply-lost H-02001: Main power lost
• storage.full H-04002: Storage full
• software.crash-loop H-06003: Crash loop

Inside a message a code is written bare, "code": "storage.full". In logs, tickets, documents and searches it is written HEART storage.full. Things that simply happen, such as system.started, are event types, not faults. The codes are defined in Part 3, Section 5.4, and their H-numbers in Section 5.7. All of it, as data: fault-codes.json.

All fault codes, by area · All fault codes, by H-number · Problem types (API errors)