BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Locate the external filling loop, which is usually a silver flexible hose connected to two valves under the boiler.Gradually open the valves to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close both valves tightly to stop the flow and ensure the boiler resets itself.
Your boiler is struggling to detect water moving through it, likely because the internal water pressure has dropped too low or a sensor is misreading the situation.
Check your boiler control panel to see if the pressure gauge is below 1.0 bar.If the pressure is low, locate the filling loop (usually a silver braided hose under the boiler) and open the valves to let water in until the needle reaches 1.5 bar.Once the pressure is in the green zone, close the valves tightly and restart the boiler.
Your boiler has stopped heating because it cannot detect enough water moving through the system to operate safely.
Check your boiler pressure gauge to see if it is below 1.0 bar.If the pressure is low, locate the filling loop under the boiler.Open the valves to allow water into the system until the gauge reads between 1.0 and 1.5 bar, then turn the valves off tightly.
Your boiler has failed to light the flame needed to heat your home's water.
Full guide for E01Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Full guide for E02Your boiler's temperature sensor is providing incorrect readings, so it has purposefully shut down to prevent overheating.
Full guide for E05on the Halstead Wickes 100
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 Halstead 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