S.00 — Heating Mode Error: No Heat Demand (EcoTEC Pro / EcoTEC Plus)

What does S.00 mean?

This indicates an error within the heating mode where no demand for heat is being registered in your EcoTEC Pro / EcoTEC Plus boiler. This can be caused by control settings or a fault preventing the demand from being sent.

• No heat demand from external controls
• Thermostat or programmer error

Click steps to track your progress.

1. 1

   Check your room thermostat is set above the current room temperature and your programmer is active.

2. 2

   Try restarting the boiler by turning off and on the main power supply.

3. 3

   Ensure there are no external control devices (like smart thermostats) reporting errors.

4. 4

   If the issue persists, contact a qualified heating engineer to check your controls and boiler settings.