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Thanks for the reply. It's the Potterton Prima F. I have a feeling it may be a failed thermostat internally, and the boiler is cutting out as a safety mechanism. For a few months now, there has been loud clicking, as if from a bi-mettalic strip that at a certain temperature clicks on and...

My boiler is not firing properly. The pilot light is fine, and when cold the jets fire fine, then after about five minutes of running, the jets go out and whilst the water is still being pumped around the system, the jets do not re-light however the pilot burner stays alight. I have tried...