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

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Jboy

from United Kingdom

Joined: 01 Apr 2007
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Location: Nottingham,
United Kingdom

PostPosted: Sun Apr 01, 2007 11:35 am Reply with quote

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.
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Rob

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PostPosted: Sun Apr 01, 2007 11:57 am Reply with quote

Is this your own boiler?
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gas4you

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PostPosted: Sun Apr 01, 2007 12:03 pm Reply with quote

Have you connected aps pipes the correct way around? Try switching them to eliminate this.
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nortimax

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PostPosted: Sun Apr 01, 2007 12:08 pm Reply with quote

Jboy wrote:
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.


Does this boiler have a pilot or a flame rectification?
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Jboy

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Location: Nottingham,
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PostPosted: Sun Apr 01, 2007 12:11 pm Reply with quote

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?
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Jboy

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Location: Nottingham,
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PostPosted: Sun Apr 01, 2007 12:12 pm Reply with quote

Whats flame retrification? It has a pilot which automatically fires up normally.
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gas4you

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PostPosted: Sun Apr 01, 2007 12:16 pm Reply with quote

Jboy wrote:
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?


If it worked like this then it would prove fan/aps/pipe fault
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nortimax

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PostPosted: Sun Apr 01, 2007 12:17 pm Reply with quote

That could be your problem. no pilot no rectification no boiler!
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gas4you

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PostPosted: Sun Apr 01, 2007 12:19 pm Reply with quote

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?
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Jboy

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Location: Nottingham,
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PostPosted: Sun Apr 01, 2007 12:24 pm Reply with quote

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!)
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nortimax

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PostPosted: Sun Apr 01, 2007 12:25 pm Reply with quote

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.
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Jboy

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Location: Nottingham,
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PostPosted: Sun Apr 01, 2007 12:26 pm Reply with quote

Just to add the fan goes for 1 second & stops for 1 sec etc.
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nortimax

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PostPosted: Sun Apr 01, 2007 12:26 pm Reply with quote

Thought you said you had replaced the pressure switch sorry.
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Rob

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PostPosted: Sun Apr 01, 2007 12:28 pm Reply with quote

fan cycling is usually the pcb, as soon as it recieves the N/O from the APS.
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nortimax

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PostPosted: Sun Apr 01, 2007 12:30 pm Reply with quote

jboys first post sates he's also changed the board.
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