Key Points. The F4 fault code indicates a failure in flame detection, leading to boiler lockout. Possible causes include stuck gas valves, wiring issues, faulty flame sensors, burner jet blockage, malfunctioning ignition leads, or a defective PCB. DIY repairs are not advisable; professional intervention by a Gas Safe Registered engineer is.. Now, wait for the system to cool down. 3. Locate the filling loop and if not already attached, secure it tightly. 4. Open the valves of the filling loop, and you'll hear the water entering the boiler. 5. Once the pressure gauge reaches 1, turn off the valves and release the filling Loop.

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Gas Engineer. May 24, 2020. #1. Hi. I've been out to look at this boiler today (I am a gas engineer) and found that this FF fault code keeps coming up even after restarting the boiler. On arrival I found pressure was on zero so I topped it back up and reset the boiler. On the display it says 141 then changes to temperature. Doesn't fire up at all.. Common fix for fault code F6, 58, F9, F-E1, F-E2, and F-F6. Inspect the fan for any obstructions or mechanical issues. Ensure that the fan is operating smoothly. Check the plug-in connection for any loose or damaged wiring. If necessary, clean or replace the fan and repair any faulty connections.