Vaillant · Turbomax Plus Boilers
This code signifies that there is a blockage within the Ecomax Pro 828E boiler appliance itself, impeding the normal circulation of water through the system.
Click steps to track your progress.
Turn off the boiler at the mains power supply.
Ensure all system valves (e.g., radiator valves) are open.
Attempt a boiler reset by waiting a few minutes and turning it back on.
If the blockage persists, contact a qualified heating engineer to diagnose and clear the obstruction.