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If the display shows two squares rotating up and down. This pertains to the 40H only.
Push the power button.
If the unit has been in operation for a while and all of the sudden the squares begin rotating. This means power was lost somehow while unit was running.
The flow meter wire is loose on the computer, or the connector where the two wires connect between the computer and the flow meter are loose.
The remote itself may have a short, or the power cord going to the computer one of the prongs may not be making a good connection threw the connector or the computer.
If all of this has not fixed the issue then you may have a faulty computer.
Item Available:
-40H:
-40HI: