Im no heating engineer, but I had same prob, I had to fit a new fan, which was an easy job. If yours is jamming, which the old style ones did (if your 24cdi is older than about 2003), this will stop boiler igniting pilot as safety precedure, then switch boiler off automatically. The fan is located at top of the boiler, behind front panels, so listen to see if it runs when you switch heating on. If you are left with flashing lights, remove front panel on boiler, on the reverse of this panel is a guide tellin you what the different flashes mean.
If it is the fan you should def consider changing yourself, easy.
Jex3
February 2009
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