Boss AX1-2.5E, Operation & Maintenance Manual

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If the pump has a plastic bleed screw like the one shown below, do not use excessive
force or attempt to use any tools to turn it as this may damage the pump casing.
Forcing Pumps to Run
Turn on the power supply to the digital controller and wait for the system pressure to
appear on the display. Then, enter the code 0823 and go to the first setting in the
menu, cold fill. While at this point in the menu, holding down the (MUTE) button will
force pump 1 to run, and holding down the (SET) button will force pump 2 to run.
If the controller is older than V6.1 then there is no way to force pump 2 to run via the
controller. To force the second pump to run, the unit must be isolated and the live
wires in terminals 13 and 14 must be swapped over. The second pump then becomes
“pump 1” and can be forced to run via the controller.
To bleed the pumps, the pumps must be started. Then while the pump is running, the
bleed screw must be opened until all the air has been removed and only water is being
discharged. The bleed screw can then be closed.
Failure to bleed the pumps may result in damage to the equipment, system and
property.
After bleeding the pumps, close the drain valve and remove the hose from the hose
tail.