Thermostat shows E19 and cannot join the user’s account; pairing via QR code fails repeatedly.

Safety first: No electrical work is required for registration issues.

• Check QR code: Ensure the QR code on the Drayton thermostat or HubR is clean and undamaged. Try manual entry of the serial number if supported.
• Remove old registrations: If the device was previously linked to another account, remove it from that account or perform a factory reset to clear old bindings.
• Correct region: Confirm that the app region matches the device’s intended market.
• Factory reset: Reset the thermostat or HubR to factory defaults and retry registration.
• Replace if ID invalid: If the app reports an invalid or duplicate ID after all steps, the device identity may be corrupted. Replace the thermostat or HubR.