All Oasis heatpumps have a flow switch inside their external water pipe that will switch the unit on when water is flowing, and off when the water stops flowing. An EO3 message (triggered by the flow switch) will appear on the unit's screen each time the waterflow stops (your pool's pump/filter turns off) and the heat pump turns itself off.
Once the water starts flowing (your pools pump/filter turns back on) the E03 error clears itself.
The E03 message is only of concern if the pool pump turns the water flow on and the Heat Pumps does not start. Call or email Oasis if this is an issue.
www.oasisheatpumps.com

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