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Hello, I am not able to find the manual for that boiler in my files... generally however there is a thermostat inside the boiler that you can simply turn the dial on to adjust.... if you can send me the relevant page from the manual you have, I will take a look at it for you.
Use tje paper clip icon at the right end of the tool bar to attach a photo of the page in the manual, or
the '+attach file' link to the left of the send button.
We can go from there if you wish, or I can opt out to other of our experts here... with that particular boiler though odds are not good that anyone else will have the manual.