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Nope hasn't all night. Nothing at all so might have a problem here not fixed by increasing pressure.No error code now and hot water works...any idea?

Cheers both - that worked in that the hot water is working. Heating isn’t though, Nest thermostat is suggesting it will take 2 hours to heat up so will wait and see. Noted on the replacement boiler!

Good afternoon, I have the F37 error on my boiler. The pressure is around 0.5- so suspect this needs to be increased however I cant determine what valves relate to the water pressure. Have included a picture below if this helps. Thanks!