BoilerFaultCodesThe 6 most common faults
Your boiler's control panel and its internal computer are not talking to each other, meaning the unit cannot receive instructions to provide heat or hot water.
Why it happens: This fault occurs when the data link between the boiler's control screen and its main internal computer is broken or interrupted. The most common reason is a loose wiring connection or a component failure caused by a power surge or natural wear and tear. Without this communication link, the boiler cannot process your heating requests and shuts down for safety.
Full guide for conYour boiler has detected that it is running too hot because it does not have enough water inside the system to function safely.
Check your boiler's pressure gauge on the front display; if it is below 1.0 bar, the system needs more water.Locate the filling loop (usually a silver braided hose with one or two valves) underneath the boiler.Open the valves slowly to top up the system pressure until the needle reaches the green zone (between 1.0 and 1.5 bar), then close the valves tightly.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Locate the external filling loop, usually two small valves connected by a flexible silver hose underneath the boiler.Slowly open the valves to let water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.Firmly close both valves and check the display to see if the error code has cleared.
Your boiler has detected trapped air bubbles that are preventing water from flowing properly and heating up, causing the system to shut down for safety.
Check your boiler pressure gauge and ensure it is between 1.0 and 1.5 barTop up the pressure using the filling loop if it is below 1.0 barBleed your radiators starting from the ground floor and working your way up to release any trapped airReset the boiler using the flame-through-a-cross button on the front panel
Your boiler is struggling to heat up because there is either not enough water in the system or the water isn't circulating properly.
Check your boiler pressure gauge; if it is below 1 bar, use the filling loop to top it up to approximately 1.5 barOnce pressure is restored, reset the boiler using the flame/reset buttonCheck all radiators for cold spots that might indicate air locks in the system
Your boiler has trapped air inside its system, which is preventing the internal water pump from moving heat around your home properly.
Check your boiler pressure gauge to ensure it is between 1.0 and 1.5 bar.If low, use the filling loop to top up the system pressure to the correct level.Bleed your radiators starting from the ground floor and moving upwards to release any trapped air.
on the Vaillant ecoTEC Plus 832
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Vaillant shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue