Boss MX1-3HL - Troubleshooting; Fault Finding Guide

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Rev 2.1 Oct-15 Page 23 / 28
Troubleshooting
If for any reason the pressurisation unit does not seem to be functioning correctly, please refer to the table
below for a list of solutions to known problems.
If the pressurisation unit is showing a fault code on the display, holding down the [SET] button will
cause the current system pressure to be temporarily shown on the display.
Fault Finding
• Check electrical supply.
• Check for external controls affecting the unit.
• If the pump is running continuously:
 Either the system is not full (possibly a leak)
 Check the pump pressure switch operation
 Check the Pressure Reducing Valve operation
• If the pump does not run:
 Check the pump pressure switch operation
 Check the pump operation
 Check the internal filter within the break tank is present and clear
• If the unit fails to pressurise the system:
 Check the system connection valve is open
 The operation of the break tank float valve that there is water available in the break tank
 Check the internal filter within the break tank is clear
 Check for system leaks
• For intermittent running, but normal when pressurising, check for system leaks
• If the system over-pressurises:
 Check the operation of the pump pressure switch
 Check the operation of the Pressure Reducing Valve (if fitted)