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Thanks for your reply The problem seems to be the boiler shuts down,(fan off pump off) and when the water in the heat exchanger cools, the boiler, and pump then starts up and goes through the same procedure again. I cant understand why the whole thing shuts down after the boiler stat...

Problem Boiler fires up on Central Heating Mode, Pump runs and system heats up. Boiler reaches temperture and thermistor shuts boiler burner down. Pump runs on, then.. Pump and boiler shut down. for no reason! (approx 45 seconds after boiler gas goes off) Boiler gradually...