vSMART indicates 'Frost protection' and maintains a low temperature even when higher setpoints are selected.

Steps to exit frost protection:

• Check modes: In the app, ensure the system is not in holiday, away, or frost‑only mode. Switch back to normal or comfort mode.
• Increase setpoint: Set a higher room temperature and wait 10–15 minutes to see if the boiler responds.
• Outdoor sensor check: If an outdoor sensor is installed and reading extremely low or faulty values, inspect and replace it as needed.
• Boiler status: Check the boiler display for any freeze‑protection or sensor errors that may be forcing frost mode.

If the system remains stuck in frost protection despite correct settings, a boiler or control board fault may be present and should be investigated by a technician.