S.16 — DHW Mode Fan Overrun Error (EcoTEC Pro / EcoTEC Plus)

What does S.16 mean?

This error indicates that the EcoTEC Pro / EcoTEC Plus boiler's fan continues to run for an unusually long time or unexpectedly after the domestic hot water (DHW) cycle has completed.

• Fan malfunction
• Control system error

Click steps to track your progress.

1. 1

   Reset the boiler by turning off and on the main electrical supply.

2. 2

   Check that the flue terminal outside is clear and unobstructed.

3. 3

   If the issue persists, contact a qualified heating engineer to inspect the fan and associated controls.