PLEASE can somebody help, we live out in the sticks and have recently re-installed a Camray 5 oil boiler. The boiler worked fine for 1 day and then just locked out. We opened it up and cleaned out nearly 1/2 bin liner full of soot. The boiler then worked fine again for 1 day and its now packed up again. What can be causing all this build up of soot, has anyone any ideas????