Heater/Circulator - Weak Water Flow

An analyst turned our 708-DS Agilent Dissolution Bath and when they initialized the system today, the error message heater air pocket or Heater OFF appeared.

I primed our pump G7986A and the temperature came back to increase and stabilized at 37°C. However, I noticed the flow coming out is really weak in comparison to another Agilent disso we have. I almost can not see the pump is working, even all the lights are green. When I prime I can see the flow is stronger, but 30 seconds later I cannot see the water flow anymore.

Is there any part in the pump that would be needed to be replaced?

Thank you so much.

Have a nice day.

Best regards,


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