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Cold CH system pressure is 1bar and it rises to about 2.2 bar max when the system is hot - according to the pressure gauge on the boiler.

CH system is loosing pressure - drops from 1bar to zero over ~7days. Sime 100c combi boiler. So far, in no particular order; No signs of any leaks within the boiler itself. Replaced the PRV and had a bucket under overflow to double check PRV is holding - no leaks. Checked the CH...

Hi, long time listener first time caller... Sime Format 100C combi boiler. 5 years old, serviced annually, runs perfectly 99.9% of the time... ...when the outside temperature drops down to near freezing it develops a strange quirk. With demand from either DHW or CH the boiler fires up...