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F13 fault with Saunier Duval Xeon Condens 30 HE?

I had a thermistor fault and fixed that. Now I keep getting an intermittant F13 fault.
Also the boiler makes a pop noise when it swicthes off.
The wiring appears to be intact and I have measured through with a meter.
Can anyone help me with this one please?
Andrew, May 2009
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