S.34 — Heating Mode Frost Protection Error (EcoTEC 65kW)

What does S.34 mean?

This indicates a problem with the EcoTEC 65kW boiler's frost protection function in heating mode, which is designed to prevent pipes from freezing in cold weather.

• Frost protection system malfunction
• Sensor fault in cold conditions

Click steps to track your progress.

1. 1

   Ensure the boiler is receiving electrical power.

2. 2

   Check your system pressure and top up if it's low.

3. 3

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

4. 4

   If cold weather persists and the error remains, contact a qualified heating engineer to inspect the frost protection system.