Fault codes¶

When the heat pump controller detects a fault, it stores a code between 701 and 807. The plugin shows the newest one on the Last fault device (unit 203) and, when a new fault appears, writes it to the log and sends a notification. This page lists what each code means.

How the Last fault device works¶

• It shows the controller's newest stored fault with its date and time, for example 790: Severe inverter fault (2022-07-15 13:18). The time is shown in the time zone of your Domoticz server.
• The fault stays visible after it is cleared; the controller keeps its fault memory until an installer clears it. "No faults" means the controller has none stored.
• The message follows the plugin language: Dutch, German, Polish and English have their own texts; French uses the English text.
• A code the plugin does not know shows as <code>: Unknown fault.
• The total number of stored faults is on the Error count device (unit 200, unused by default).

Notifications¶

When the controller stores a new fault, the plugin writes an error line to the Domoticz log and sends one notification through every notification system set up in Domoticz (Setup → Settings → Notifications):

Heat pump fault 790: Severe inverter fault (2026-11-03 07:12)

Each fault is announced once, also across restarts. The fault that is already stored when the plugin first reads your controller (after installing or upgrading) is not announced.

All codes¶

Reset: Automatic means the heat pump restarts by itself; Automatic after a waiting time means it restarts after a countdown shown on the controller; Installer means the fault must be acknowledged on the controller, usually by an installer. An empty cell means the manual gives no details for that code.