Stuart Turner Stuart SPU 130 Mini, Installation, Operation & Maintenance Instructions Manual, Page: 26 / 32

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11 TROUBLE SHOOTING GUIDE
Symptoms Error Code Probable Cause Recommended Action
Pump(s) not
starting
No power to SPU Ensure the green light is on the front of the SPU, check fuse.
Low water Low water in tank
Depress float valve to varify water is filling tank, check water level
and supply.
System pressure =
set pressure
SPU functioning correctly. Check the set system pressure.
Sensor error Pressure sensor
fault
Remove pressure from the SPU outlet and verify the displayed
pressure is 0 bar. Er will be displayed if the sensor signal is outside
parameters. (Replace sensor - call Stuart Turner).
Pump(s) will not
stop
System pressure set
too high
System set pressure is set higher than the pump performance
capability, reduce set pressure. Ensure you have purchased the
correct SPU for the system pressure required.
Sensor error Pressure sensor
fault
Remove pressure from the SPU outlet and verify the displayed
pressure is 0 bar. Er will be displayed if the sensor signal is outside
parameters. (Replace sensor - call Stuart Turner).
Low pressure
alarm triggered
Low pressure
Leak in system. Check system for leaks. Check for leaking pressure relief valve.
Low pressure alarm
set too high.
Reduce Low press alarm pressure. Check system pressure range
during normal operation.
Sensor error Pressure sensor
fault
Remove pressure from the SPU outlet and verify the displayed
pressure is 0 bar. Er will be displayed if the sensor signal is outside
parameters. (Replace sensor - call Stuart Turner).
High pressure
alarm triggered
High pressure System pressure
too high
Check system operation. Increase High presure alarm set pressure.
Sensor error Pressure sensor
fault
Remove pressure from the SPU outlet and verify the displayed
pressure is 0 bar. Error will be displayed if the sensor signal is outside
parameters. (Replace sensor - call Stuart Turner).
Sensor failure
error
Sensor error Pressure sensor
outside specifcation
Remove pressure from the SPU outlet and varify the displayed
pressure is 0 bar. Er will be displayed if the sensor signal is outside
parameters. (Replace sensor - call Stuart Turner).
Water
overflowing
warning pipe or
weir
Water level too high Check function of the fill valve, replace or adjust if needed.
Manifold NRV
leaking
Isolate SPU from system and mains water and replace non-return
valve and manifold.