Navien NaviCirc Series Installation And Operation Manual page 21

Keep the fixture open to allow the hot water line to purge.
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Set the water heater temperature to a higher temperature.
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Check whether the pump is stuck.
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If NaviCirc is used on a non-Navien appliance, check that the pump is
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properly sized and installed per the manufacturer's instructions.
Clean out the water heater filter and the NaviCirc inlet.
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Contact Navien Technical Support.
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Contact Navien Technical Support.
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Adjust the water heater temperature.
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It is normal for some hot water to bleed over to the cold line during
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recirculation.
If the hot water discharge continues to come from the cold water
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faucet after installation, the NaviCirc may require service.
In this case contact Navien Support.
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The NaviCirc will stop recirculation if it reaches the set temperature
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during recirculation. This is the NaviCirc temperature cut-off function
and small noises may occur. This means the NaviCirc is operating
normally.
If other noises occur, contact Navien Technical Support.
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What to do
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