Boss AX1-2.5E, Operation & Maintenance Manual

Page: 29 / 44

29
Symptom Problem Solution
P1 and/or P2 FAIL is displayed
The PUMP TYPE option is set
incorrectly.
Review PUMP TYPE setting
The relevant pump has failed Replace pump
P2 FAIL is displayed but the unit
is a single pump model The PUMPS NUMBER option is
incorrectly set to 2
Set PUMPS NUMBER to 1
LOW H20 fault is displayed
The mains water supply to the
unit has been isolated
Turn on the mains water supply
The mains pressure is poor
The fault will clear once the
break tank has been re-filled
A non-standard electrical
connection has been made into
terminals 19 & 20
Remove all non-standard
electrical connections
The low water float switch has
failed
Replace low water float switch
The digital controller has failed Replace digital controller
HIGH H20 fault is displayed
A non-standard electrical
connection has been made into
terminals 21 & 22
Remove all non-standard
electrical connections
The digital controller has failed Replace digital controller
Pressure reading does not
match actual system pressure.
The internal isolation valve
within the unit is closed Open the internal isolation
valve
The SENSOR TYPE option is set
incorrectly
Review SENSOR TYPE setting
A non-return valve has been
installed between the unit and
the system
Remove non-return valve
The pressure sensor has failed Replace pressure sensor
ERROR 1 fault is displayed
The SENSOR TYPE option is set
incorrectly
Review SENSOR TYPE setting
The pressure sensor has failed Replace pressure sensor
Pump runs but does not make
up pressure The pump is air-locked and not
pumping water
Bleed the pump
The pump is persistently
becoming air-locked
The wrong/no flow restrictor is
installed in the float valve (MX,
Digifiller and midi units only) Check float valve flow restrictor
selection (MX, Digifiller and
midi units only)