Thermostat shows E09 and cannot join the Wiser system after a reset

Safety first: No mains work is required for this procedure.

• Remove old pairing: In the Wiser app, delete the thermostat from the device list. If you no longer have access to the old system, perform a hard reset on the thermostat (refer to manual).
• Reset Heat Hub pairing mode: Press and hold the pairing button on the Heat Hub until the LED indicates pairing mode (see Wiser documentation).
• Factory reset thermostat: Use the reset pinhole or button sequence to restore factory settings. This clears previous bindings.
• Re-add via app: Use the Wiser app to add a new room thermostat and follow the on-screen instructions. Keep the thermostat within a few metres of the Heat Hub during pairing.
• Update firmware: Once paired, check for firmware updates for both the Heat Hub and thermostat. If E09 persists, contact Wiser support as the device may be locked or defective.