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Ideal Logic System IE Gen 2 fault F16

Gas valve fault

Gas boiler

What it means

Fault indicating an issue with the gas valve or its wiring.

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

The full answer, free

  • 59 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 49), right under the answer
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Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.

From the Ideal manual for the Logic System IE Gen 2. Check the model on the data plate before you order parts.

Other Ideal Logic System IE Gen 2 fault codes