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 (WMDA units
only)
Check float valve flow restrictor
selection (WMDA units only)
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
Check float valve flow restrictor selection
The float valve position is set incorrectly Set the float valve to its lowest 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 buons 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
32
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