Boss MX1-3E - Break Tank Overfilling; Controller Issues

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Symptom
Problem
Solution
The break tank is overfilling and
discharging water to drain or
over the weir
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)
The float valve position is set
incorrectly
Set the float valve to its lowest
possible position
The float valve has failed
Replace float valve
A pump non-return valve has
failed
Replace non-return valve
The pump is repeatedly running
in short bursts
The internal isolation valve
within the unit is partially
closed
Fully open the internal isolation
valve
The restriction in the
connecting pipe work is too
great
Increase bore/ reduce number
of bends/ reduce length of
connecting pipe work
A pump non-return valve has
failed
Replace non-return valve
The expansion vessel has failed
or lost its pre-charge
Check the expansion vessel pre-
charge and re-charge if
necessary
The point of connection of the
unit is too far away from the
expansion vessel
Move unit/expansion vessel
connection points closer
together.
The buttons on the digital
controller do not respond
The plastic housing of the
digital controller has come
apart and the PCB has moved
Reassemble the digital
controller housing and ensure
that the PCB is properly seated
The digital controller
parameters are being corrupted
The controller is beings subject
to power spikes
Fit a suitable power filter
The digital controller does not
power up when the unit is
switched on
The fuse has blown
Replace the fuse
The mains power supply is at an
incorrect voltage or frequency
Check mains power supply
The 12V transformer has failed
Replace Transformer
The digital controller has failed
Replace digital controller
SERVICE is displayed on the
screen
The unit is due an annual
service
Contact service engineer