Ideal Logic System IE fault F16

What it means

Boiler has detected a fault with the gas valve.

Likely causes

1. Faulty gas valve wiring
2. Faulty gas valve
3. Low gas pressure
4. Gas valve wiring/PCB fault
5. Faulty spark generator causing ignition failure
6. Faulty electrode
7. Blocked condensate/trap
8. Flue components not correctly assembled, fixed or supported
9. Flue or flue terminal obstructed
10. Seals on flue extensions displaced during installation
11. Combustion products and inlet air mixing due to flue integrity fault
12. Gas control valve fault requiring replacement
13. Spark generator fault requiring replacement
14. CO/CO2 ratio greater than 0.004 indicates need for cleaning
15. Debris or deposits in heat engine/sump outlet
16. Damaged electrode affecting combustion
17. Condensate trap blockage or drying out
18. Combustion deposits building up on heat exchanger
19. Damaged or worn electrode affecting spark gap
20. Debris in sump outlet or condensate trap
21. Water or gas joint leakage
22. Faulty gas control valve requiring replacement

Where to start

1. Check gas valve wiring
2. Restart boiler and check if it ignites briefly then extinguishes
3. Check gas pressure at boiler inlet is >18 mbar