Passion Veneto - How do I bleed air from my system?

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How do I bleed air from my system?
When draining and refilling your spa, the pump may become air
locked. An air-locked pump stops water from flowing in your spa
and is easily resolved by bleeding off the trapped air. To do this:
• Turn off all pumps
• Open the access panel below the topside control panel
• Loosen a heater union until you hear the trapped air escape
• Once water drips out in a continuous stream, hand tighten the
union until the water stops leaking
• Loosen the discharge union on Pump 2 as above
• Turn on all pumps to make sure that there are no leaks
• Put the access panels back on