BoilerFaultCodesThe 6 most common faults
Your boiler is currently completely unresponsive because it is not receiving any electrical power.
Check that the boiler isolator switch (usually a white switch near the boiler) is set to the ON position.Check your home's main fuse box (consumer unit) to see if any circuit breakers have tripped.Locate the fused spur next to the boiler and check if the replaceable fuse inside has blown.
Your boiler has stopped working because it has detected an issue with its water pressure or internal sensors, preventing it from safely heating your home or water.
Check the boiler pressure gauge on the front panel; if it is below 1.0 bar, use the filling loop to top it up to between 1.0 and 1.5 barTurn the boiler off at the mains for 60 seconds to reset the electronic faultTurn the boiler back on and observe if the error clears
Your boiler is struggling to start because the water pressure inside your heating system has dropped too low.
Locate the filling loop, which is usually a small silver braided hose or a plastic key underneath the boiler.Open the valves on the filling loop slowly to let water into the system.Watch the pressure gauge on the front of the boiler and close the valves once the needle reaches 1.5 bar.
Your boiler is not receiving any power, meaning it cannot turn on or provide any heating and hot water.
Check if other appliances in your home are working to ensure there isn't a general power cut.Ensure the boiler's power switch or fused spur on the wall is turned on.Check your property's main fuse box or consumer unit to see if a circuit breaker has tripped.
Your boiler has detected an issue that could be caused by low water pressure or a faulty internal sensor, leading to a safety shutdown.
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the filling loop to top up the system until the needle reaches the 1.5 bar mark.Restart the boiler to see if the fault clears; if the pressure is correct and the code remains, you will need an engineer.
Your boiler has detected low water pressure or a faulty internal sensor, causing the heating system to shut down for safety.
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is below 1 bar, use the filling loop to top up the system with water until it reaches the correct level.Restart the boiler to see if the fault clears.
on the Ferroli Optima 201
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 Ferroli 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