Fault finding chart – Xylem FC FCT (Single & Twin Version) User Manual
Page 16
16
en
For FCTS models:
suitably-sized blind flanges are available (see blind flange kits) in case it is necessa-
ry to remove one of the two motor-impeller assemblies, in order to enable the conti-
nuous operation of the remaining assembly.
7.3 Assembly
For re-assembly, follow the disassembly procedures in the reverse order. Change the gaskets and any
damaged or worn parts.
8. Fault finding chart
PROBLEM
Pump does not start
Pump does not deliver
Insufficient delivery
Pump stops after a short
interval
The pump vibrates and
is too noisy
PROBABLE CAUSE
No power supply
Automatic switch tripped or blown
fuses
Overload protection
Impeller jammed
There is air in the system and in the
pump body
Incorrect direction of rotation
Pump or pipes obstructed
Pump runs beyond rated capacity
Overload protection trips
The pump does not rotate freely
Liquid is too viscous
Worn ball bearings
The pump is cavitating
Foreign matter inside the pump
POSSIBLE REMEDIES
Supply electrical power
Re-set the switch and replace the
fuse
Re-set the protection
See point 6.2
Bleed the system and prime the
pump (see point 6.2)
See point 6.1
Disassemble and/or clean
Partially close the delivery gate valve
Replace bearings
See paragraph 6.2
Disassemble and/or clean
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