Use this ground source heat pump service checklist to perform a thorough maintenance visit. Record model and serial numbers, assess the unvented cylinder, expansion vessel, relief and temperature and pressure valves, and clean inline strainers. Inspect electrical and pipe connections, look for oil that may indicate a refrigerant leak, verify antifreeze levels and system pressure, release air from the heating circuit, confirm room thermostat and zone valve operation, test carbon monoxide and smoke alarms, capture meter readings, photos, and signatures.
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