Saunier Duval Xeon 60FF boiler won't run. Fan Hunting?

Discussion in 'Plumbing and Central Heating' started by Jboy, 1 Apr 2007.

  1. Jboy

    Joined:
    1 Apr 2007
    Messages:
    19
    Thanks Received:
    0
    Location:
    Nottingham
    Country:
    United Kingdom
    The boiler won't fire up, the flue fan just keeps stopping & starting. Followed Faulting guide & swapped Air pressure switch & control board, checked all piping, also swapped fan but no change. Any idea's? Also what is the Air pressure switch actually "looking" for? Positive pressure down the red pipe, vacuum up the clear? If I disconnect both pipes to the switch the fan will run constantly but the boiler still doesn't fire up.
     
  2. Rob

    Rob

    Joined:
    14 Aug 2006
    Messages:
    4,481
    Thanks Received:
    415
    Location:
    London
    Country:
    United Kingdom
    Is this your own boiler?
     
  3. gas4you

    Joined:
    23 Feb 2007
    Messages:
    17,963
    Thanks Received:
    864
    Location:
    Norfolk
    Country:
    United Kingdom
    Have you connected aps pipes the correct way around? Try switching them to eliminate this.
     
  4. nortimax

    Joined:
    30 Mar 2007
    Messages:
    285
    Thanks Received:
    25
    Country:
    United Kingdom
    Does this boiler have a pilot or a flame rectification?
     
  5. Jboy

    Joined:
    1 Apr 2007
    Messages:
    19
    Thanks Received:
    0
    Location:
    Nottingham
    Country:
    United Kingdom
    Yup, it's my own boiler- worst luck. Pipes checked both have no leaks & red pipe confirmed goes from H on APS to near the output on the fan. If I swap them around on the APS the fan runs continuous but still no led3 or boiler firing up. Huge blast of air out the flue, no change of I block flue with my hand. Should I be able to start the boiler firing if I gently blow down the red pipe?
     
  6. Jboy

    Joined:
    1 Apr 2007
    Messages:
    19
    Thanks Received:
    0
    Location:
    Nottingham
    Country:
    United Kingdom
    Whats flame retrification? It has a pilot which automatically fires up normally.
     
  7. gas4you

    Joined:
    23 Feb 2007
    Messages:
    17,963
    Thanks Received:
    864
    Location:
    Norfolk
    Country:
    United Kingdom
    If it worked like this then it would prove fan/aps/pipe fault
     
  8. nortimax

    Joined:
    30 Mar 2007
    Messages:
    285
    Thanks Received:
    25
    Country:
    United Kingdom
    That could be your problem. no pilot no rectification no boiler!
     
  9. gas4you

    Joined:
    23 Feb 2007
    Messages:
    17,963
    Thanks Received:
    864
    Location:
    Norfolk
    Country:
    United Kingdom
    As nortimax says. If no pilot and burner lighting then fan will keep stopping and starting each time the boiler tries to light. probably do this about 3-5 times then lock out. Is this what you are getting?
     
  10. Jboy

    Joined:
    1 Apr 2007
    Messages:
    19
    Thanks Received:
    0
    Location:
    Nottingham
    Country:
    United Kingdom
    If it worked like this then it would prove fan/aps/pipe fault[/quote]
    Sorry I don't understand, it must be the cold! The PCB has 4 neons, only 1 & 2 are lighting. The faulting guide indicates an air flowing fault. If neon 3 was lit it suggestes ignition, pilot or flame problem. I've just checked the old APS & it seems to switch ok when I blow down the H connector. (Should have checked it before rather than take the guides word it was the fault!)
     
  11. nortimax

    Joined:
    30 Mar 2007
    Messages:
    285
    Thanks Received:
    25
    Country:
    United Kingdom
    You might have spent a lot of money for a blocked pilot injector. Rectification is (believe it or not) when you put an AC current to a flame. The flame carries the current changes it to DC and is picked up by the flame sensor. Simple and effective flame failure device.
     
  12. Jboy

    Joined:
    1 Apr 2007
    Messages:
    19
    Thanks Received:
    0
    Location:
    Nottingham
    Country:
    United Kingdom
    Just to add the fan goes for 1 second & stops for 1 sec etc.
     
  13. nortimax

    Joined:
    30 Mar 2007
    Messages:
    285
    Thanks Received:
    25
    Country:
    United Kingdom
    Thought you said you had replaced the pressure switch sorry.
     
  14. Rob

    Rob

    Joined:
    14 Aug 2006
    Messages:
    4,481
    Thanks Received:
    415
    Location:
    London
    Country:
    United Kingdom
    fan cycling is usually the pcb, as soon as it recieves the N/O from the APS.
     
  15. nortimax

    Joined:
    30 Mar 2007
    Messages:
    285
    Thanks Received:
    25
    Country:
    United Kingdom
    jboys first post sates he's also changed the board.
     

Share This Page