biasi 24s problem

[talon]

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on CH mode the boiler fires for a few hours then I notice the rads have gone cold and the lock out light is up,it seems to reset but does the same later, I was looking at maybe another problem but as you mentioned the fan I have noticed the fan has got a lot noisier, could it be the fan playing up as the boiler gets hotter and when I come to reset it its cooled again ?
I know the pumps fine and that on these boilers its the pump start first ,then the fan so this could explain it.
any ideas anyone,
DHW seems to be ok.

 

[Agile]

If the ignition lockout light comes on then it could be any of several problems:-

Fan
Venturi
Air Pressure Switch
Gas valve sticking
Minimum gas pressure incorrectly set.

Since you say the fan has become more noisy then that sounds most likely to be involved with your problem. Replacement fan costs about £96.

However all those listed above are gas or safety related so I would not advise you to tamper with them and suggest you call a CORGI registered engineer.

Tony Glazier