Vaillant · Turbomax Plus Boilers
This code suggests an error related to the water pump operating in heating mode in your EcoTEC Pro / EcoTEC Plus boiler, possibly indicating it's not circulating water effectively or is running when it shouldn't be.
Click steps to track your progress.
Check your system pressure and top up if it's low.
Restart the boiler by cycling the power off and on at the mains.
Ensure all radiator valves are open to allow proper circulation.
If the error persists, contact a qualified heating engineer to inspect the pump and system.