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Well......I'm stumped! Looks like I'll have to get an engineer out. Unless anyone has any other thoughts?? Is it better to get an Ideal engineer or a local Corgi plumber? Thanks.

As far as I'm aware it hasn't been serviced for a while although I did clean out the main burner and the fan. My first thought was the air pressure switch which I have just replaced(sorry forgot to say that in earlier post) and still nothing???

My Ideal C80FF(I know its c**p) boiler goes into a continuous loop of firing up for 20secs then shutting down for 20secs then firing up for 20secs etc, etc for both DHW and CH. Can anyone suggest a likely cause? The fan and pump continue to run after ignition goes out. Thanks in advance...