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How important is the annual maintenance service and what’s involved in it? Right now, it looks no different than the annual boiler service. This is what I have · Clean evaporator coil; · Check antifreeze; · Clean magnetic filters/strainers; · Remove trapped air; · Check primary pressure; · Check flow rate; · Check controller settings; · Ensure heat pump system is safe; · Clear debris from drip tray and ensure water is draining away correctly;