Modern Ferroli boiler fault codes are displayed on the digital display on the front of the boiler.
If your fault code isn’t listed below then you may have to find your model in this list then look up the troubleshooting instructions.
Some of the most common fault codes are:
A01 – No burner ignition
Possibly a gas supply problem. Is there gas at other appliances? Does your gas meter have credit and does the display show “ON”?
Is the condensate frozen or blocked?
Ignition or flame detection fault – gas safe engineer probably required
A02 – Flame detected with the burner off
Flame sensing fault – gas safe engineer probably required
A03 – High limit protection
The boiler is overheating so this could be related to a faulty sensor or a water circulation fault. Check radiator valves are all turned on and any isolation valves under the boiler or on magnetic filters are open.
A gas safe engineer is required to check the operation of the sensor or the pump.
A04 – Flue gas fault.
Gas safe engineer required to check the integrity of the flue.
A05 – Fan problem
Gas safe engineer required to check.
A06 – No flame after the ignition phase (6 times in 4 minutes).
Check the condensate pipework is not blocked or frozen. Otherwise gas safe engineer required to check.
A41 – Flow sensor disconnected
Gas safe engineer required to check.
A42 – Flow sensor fault
Gas safe engineer required to check.
F07 – High fume temperature
Gas safe engineer required to check.
F10 – Flow sensor fault
Gas safe engineer required to check.
F11 – Return sensor fault
Gas safe engineer required to check.
F12 – DHW sensor fault
Gas safe engineer required to check.
F13 – Exchanger probe fault
Gas safe engineer required to check.
F14 – Flow sensor fault
Gas safe engineer required to check.
F15 – Fan problem
Gas safe engineer required to check.
F34 – Supply voltage under 170V
The boiler requires a steady voltage of roughly 240V. If it is ,much lower than this the boiler will display the F34 fault. Further investigation is required to check your main supply is OK or if the boiler is displaying the wrong fault.
F35 – Irregular mains frequency
The boiler requires a steady voltage of roughly 240V. If the frequency of the AC supply is unsteady they boiler will display a F35 fault. Further investigation is required to check your main supply is OK or if the boiler is displaying the wrong fault.
F37 – Incorrect system water pressure
The pressure has dropped in your heating system. You will need to top up the pressure using the filling loop. Follow this link for more information.
F39 – External probe fault
Related to a weather compensating probe located outside. This is supposed to reduce you bills by changing the output of your heating depending on the temperature outside.
F43 – Exchanger protection activation
Gas safe engineer required to check.
F52 – Flow sensor fault
Gas safe engineer required to check.
A61, A63, A64 and F66 – Controller ABM03A fault
Gas safe engineer required to check.
A62 – No communication between controller and gas valve
Gas safe engineer required to check.