BoilerFaultCodesThe 6 most common faults
01
F37 High DIY-safe
Your boiler has stopped working because the water pressure inside the system is too low.
What to try first
Locate the filling loop, which is usually a flexible silver hose connected under your boiler.Open the valves at both ends of the hose to allow water into the system.Monitor the pressure gauge on the front of the boiler until the needle reaches the green zone (typically 1.0 to 1.5 bar).Close both valves tightly and remove the filling loop if it is not a permanent fixture.
02
F07 High Engineer
Your boiler has detected that the exhaust gases leaving the system are getting too hot, so it has shut down to prevent potential damage or overheating.
Full guide for F0703
F10 High Engineer
Your boiler is struggling to detect the flow of water because of a faulty electronic sensor, which will prevent your heating and hot water from working.
Full guide for F1004
F11 High Engineer
Your boiler is struggling to detect the flow of water through the system, which means it has stopped working to prevent potential damage.
Full guide for F1105
F13 High Engineer
Your boiler is struggling to detect the temperature of the water for your taps, which means it has stopped heating your hot water to keep the system safe.
Full guide for F1306
F14 High Engineer
Your boiler is having trouble measuring the temperature of the water flowing through it due to a faulty sensor, which means it has safely shut down to prevent overheating.
Full guide for F14on the Ferroli Energy Top B
Filling loopPressure relief valvePressure sensorFlue gas sensorHeat exchangerFlow temperature probe
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