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] buon will cause the current
system pressure to be temporarily shown on the display.
Symptom Problem Solution
LOW PRESSURE fault
is displayed and the
pumps do not run
The internal isolation valve within the unit is
closed
Open the internal isolation valve
The system pressure has fallen below the
LOW PRESSURE set point
Increase system pressure using a filling
loop, or enable the SYSTEM FILL option
The SPC CONTROLLER option is enabled Disable the SPC CONTROLLER option
The LOW PRESSURE set point is too high Review the system specifications
HIGH PRESSURE fault is
displayed
The isolation valve in the unit is closed Open the internal isolation valve
The system pressure has risen above the
HIGH PRESSURE set point
Decrease system pressure using a suitable
drain point
The expansion vessel has failed or lost its
pre-charge
Check the expansion vessel pre-charge
and re-charge if necessary
The expansion vessel is undersized Review the expansion vessel selection
The HIGH PRESSURE set point is too low Review the system specifications
P1 and/or P2 FLOOD
LIMIT is displayed
A large amount of water has been lost from
the system
Investigate cause
The pump is air-locked Bleed the pump
The unit is undersized for the system Review unit selection
The FLOOD LIMIT time is too short. Consult Flowtech
P1 and/or P2 FAIL is
displayed
The PUMP TYPE option is set incorrectly. Review PUMP TYPE seing
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 seing
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 seing
The pressure sensor has failed Replace pressure sensor
flowpress WMDA Pressurisation Units
31
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