Ferroli Fault Code F10 — Diagnose and Fix
Fault code F10 on a Ferroli boiler indicates no ignition. The gas valve opens but the spark or flame-detection circuit fails. Check the ignition lead, spark electrode gap (3–4mm), and flame sense wire before the PCB. Here is the correct diagnostic order UK Gas Safe engineers follow before ordering parts.
Step-by-step method
1. Confirm the F10 lockout
Cycle the boiler off at the fused spur for 60 seconds, restore power and press the reset button. If F10 returns within 5 minutes, proceed with diagnosis. Intermittent F10 usually points to a sensor or connection, not the PCB.
2. Check pressure and condensate first
Every fault-code diagnosis starts here: system pressure 1.0–1.5 bar cold, condensate pipe unfrozen and draining, gas supply proven at another appliance. These three account for ~60% of lockouts.
3. Test the component F10 points at
The gas valve opens but the spark or flame-detection circuit fails. Check the ignition lead, spark electrode gap (3–4mm), and flame sense wire before the PCB.
4. Reset and test-fire
After any component test, purge the gas line, restore all covers (interlocks matter), press reset and observe a full ignition cycle. Confirm flame current with a multimeter on the flame sense wire (typically 1–8 µA DC).
5. Call a Gas Safe engineer for parts
Any gas-side work on a Ferroli requires Gas Safe registration. Have the fault code, boiler GC number and serial to hand — engineers can pre-order the right part before attending.
Frequently asked questions
Can I reset a Ferroli F10 myself?+
Yes — press and hold the reset key for 5 seconds. If F10 returns, the underlying fault is still present and needs diagnosis.
How much does fixing F10 cost?+
£120–£280 typical, depending on part. PCBs are £180–£320 fitted; sensors £60–£100. Get a fixed-price quote — refuse hourly for diagnostic-only work.
Is F10 covered by boiler warranty?+
Yes if within the Ferroli manufacturer warranty period AND the boiler has valid annual services logged. Missed services void most warranties.