Use this comprehensive service checklist to maintain air source heat pumps. It covers cylinder and expansion vessel checks, relief valve testing, electrical and pipe connections, refrigerant leak indicators, antifreeze levels, filter cleaning, system pressure and air release, room thermostat and zone valve operation, smoke and carbon monoxide alarm tests, and meter readings. Capture photos, note faults and corrective actions, and record customer and engineer sign-off for complete maintenance documentation.
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