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The fan packed up. It had been noisy but was still running, when it packed up I realized that it had obviously been on the way out. I have replaced it, hoping that it would solve the problem. However, still wouldn't run properly with the case on, but would with it off. Today, with the case off...

Just been down there, when the boiler is switched on it starts to spark, pilot seems to struggle to light and when it does the flame doesn't seem very strong (it's still sparking). Sometimes the main burners will light, and the sparks stop, sometimes it'll burn for a few seconds before switching...

I checked both tanks and they are full of water. The boiler seems to switch itself on and off every second or so, it does get the water hot though. As I removed the front cover it fired up properly and stayed lit, I turned it off again and then started it again and it started switching off...

The pump is working. I do have a header tank in the attic which has over- flowed when the water has got too hot. Running the hot tap for a while stops this. How would the header tank affect the boiler? I haven't been up there to look yet, as it's a bit involved getting to it, but I have ladder...

My boiler keeps firing up and switching off every couple of seconds. Neon indicator no.4 flashes on and off as it does this. Sometimes it will stay on for a while and eventually it heats everything up, but something is obviously amiss. Any ideas?