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Hi, silly question but my central heating system has two zone valves (upstairs and downstairs). Do I need to manually open these when bleading the system?

Hi, I’m hoping someone can shed some light. I have a Baxi Ecoblue 33 Combi with around 12 radiators. I seem to keep getting air in the system which needs blessing every 2/3 days. Pressure doesn’t drop until air is released. Checked all usual spots for leaks (including valves and under floor...