Fault
Possible Cause
Remedy
Pump fails to start.
Power supply failure.
Control panel fuse blown.
Low water level.
Reinstate incoming power supply.
Replace power supply fuse.
Reinstate water supply.
Pump fails to stop.
Set point set too high.
Air in system.
System pressure low due to
large leak.
Lower set point.
Bleed pumps.
Switch unit off until leak is repaired.
Pump switches on and off
quickly.
Air in system.
Unit isolated from system
vessel or pre-charge incorrect.
Purge air from pumps and pipework.
Check vessel and system isolating valves are in the
open position and check vessel pre-charge.
Charge as necessary with Nitrogen or dry air.
Pump runs but will not
make pressure.
Pump air locked.
Large leak in system
Passing too much water.
Open bleed screw in system and vent.
Check system for leaks.
Check pump Non return valve.
Pump overheating.
Pump partially seized.
Remove pump and check for sediment build up or
foreign objects
Pump set frequently
starting. (pressure falls
to cut in point).
Newly installed system with large
amount of air in pipe work.
Leaks in system pipe work.
Vessel pre-charge incorrect.
Bleed system to remove air.
Repair leaks.
Isolate vessel and pre-charge with
Nitrogen as appropriate.
Break tank overflowing.
Non-return valve letting by.
Replace pump or non-return valve in pump.
Pump stops and
pressure drops
immediately.
Non-return valve letting by.
Vessel pre-charge incorrect.
Replace pump or non-return valve in pump.
Check vessel pre-charge and Charge as
necessary with Nitrogen or dry air.
Fault finding guide
Xylem Water Solutions UK Limited
Millwey Rise Industrial Estate, Axminster, Devon EX13 5HU - UK
Tel: 01297 630230 Fax: 01297 630270
e-mail: [email protected]
www.lowara.co.uk www.xyleminc.com
Lowara is a trademark of Xylem Inc. or one of its subsidiaries.
© 2017 Xylem, Inc.
Lowara reserve the right to make modifications without prior notice.
Code UKLIT0167 P03/17
O&M Micro Presfix_Layout 1 29/03/2017 11:15 Page 6
