Thermostat shows E19 and the app indicates ‘Zigbee/Z-Wave device error’ for a connected Ngenic-compatible accessory.

Safety: Only handle low-voltage or battery devices.

• Move accessory closer: Place the Zigbee/Z-Wave accessory nearer to the Ngenic hub or thermostat acting as hub.
• Replace batteries: Install fresh batteries in the accessory.
• Re-pair device: Remove the accessory from the Ngenic app, then add it again following the pairing instructions.
• Check compatibility: Confirm the accessory model is listed as compatible with Ngenic; update its firmware if possible.

If E19 remains for a specific accessory, it may not be fully compatible or its radio module may be defective.