Error F2

Safety first

1) If you smell gas, evacuate the property immediately, do not operate electrical switches or the boiler, and call the National Gas Emergency Service (or your local emergency number).

2) If you are unsure or uncomfortable at any stage stop and call a Gas Safe engineer / RGII. Do not open the boiler casing or attempt to repair gas components yourself.

Initial quick checks a homeowner can safely do

1) Check other gas appliances (hob, gas fire) to confirm there is gas to the house. If none work, check the gas meter isolation lever or prepayment meter credit; restore supply if it has been turned off. If there is a supply failure, contact your gas supplier.

2) Check mains power and the boiler isolate switch. If mains power is lost or voltage is low the boiler can fault – restore power and try again.

3) Check boiler pressure on the gauge. A sealed system normally needs about 1.0–1.5 bar. If pressure is very low, top up using the filling loop per your manual (only if you are confident doing this) and recheck. Low system pressure can contribute to lockouts.

4) Inspect external condensate pipe (if visible) for freezing or blockage in cold weather. If frozen, thaw gently with warm water; do not use a naked flame. A blocked condensate can prevent ignition and lead to gurgling and lockout.

5) Look at the external flue termination from ground level for obvious blockages (bird nesting, debris, leaves). Do NOT climb on roofs — if the flue is high, wait for an engineer.

Reset and restart steps

1) Set the mode knob to BOILER OFF (per manual) if you need to stop the boiler before checking.

2) Try a normal reset: press the RESTART (F) / reset button on the boiler once and allow the ignition sequence to run. The boiler will attempt to light; if it succeeds, monitor for a while to ensure it remains stable.

3) If it attempts to light several times and fails repeatedly, the S30 will show an L2 ignition lockout after multiple attempts. Do not repeatedly press reset — record the fault and proceed to call an engineer.

4) Power-cycle the boiler: switch off at the mains for 30 seconds and switch back on, then try a single restart.

Diagnostics to note and provide to an engineer

1) Note whether you heard clicking (ignition attempts) or no sound at all. Clicking with no flame often points to ignition electrode, gas valve or flame detection issues; silence could indicate no gas or no power to ignition.

2) Note any gurgling noises (may indicate condensate/build-up) or unusual fan noises (fan or air-pressure fault can prevent ignition).

3) Record the exact code(s) displayed (F2, then L2 if it progressed) and any other codes or indicators on the panel.

When to call a professional (and why)

1) Call a Gas Safe registered engineer / RGII if the F2 returns after reset, if the boiler locks out to L2, if you hear abnormal noises, if there are signs of leaks, or if internal parts (gas valve, burner, ignition electrode, flame sensor, fan, PCB) are suspected. These are gas and safety critical components that must be checked and repaired by a qualified engineer.

2) Also call a professional if you cannot reach the gas meter, if other gas appliances do not work but the meter and supply appear on, or if low mains voltage or electrical faults are suspected — an electrician may be required.

What the engineer will likely check or do

1) Verify gas supply pressure and meter isolation, test gas valve operation and ignition electrode, inspect and test the flame detection sensor, check the fan and air-pressure switches, inspect the flue and condensate system, and check PCB/controls. They will also clear any fault logs and run calibrated ignition tests.

Final notes

1) Small user actions (check gas, thaw condensate pipe, top up system pressure, single reset) can clear many simple F2 causes, but persistent or repeat flame loss must be handled by a Gas Safe / RGII engineer. Do not attempt internal repairs or parts replacement yourself. Record symptoms and the exact fault codes to give to the engineer — it speeds diagnosis and repair.