59
SALMSON 12/2013
English
10. Faults, causes and remedies
WARNING! Risk of electrical shock!
Ensure that any electrical hazard is avoided.
Ensure that the power supply is switched off and
secured against unauthorised switching before
performing any work on the electric system.
WARNING! Risk of scalding!
In case of high water temperatures and high sys-
tem pressures, close the insulating valves upstream
and downstream of the pump.
First, allow pump to cool down.
If the fault cannot be resolved, please
contact the Salmson customer service.
Fault
Possible causes
Remedies
Pump does not operate
No current
Check fuses, wiring and connections
Thermistor tripping device has tripped,
cutting off power
Eliminate any cause of overloading of the
motor
Pumps is running but output is insuffi-
cient
Incorrect direction of rotation
Check the direction of rotation of the
motor and correct it if necessary
Parts of the pump are obstructed by for-
eign bodies
Check and clean the pump
Air in suction pipe
Seal the suction pipe so that it is airtight
Suction pipe too narrow
Install a larger suction pipe
Valve opening is insufficient
Open the valve properly
Pump output is erratic
Air inside the pump
Vent the pump; check that the suction
pipe is airtight. If required, start the
pump for 20 – 30 s – open the venting
plug to remove air – close the venting
plug and repeat the procedure several
times until no more air escapes from the
pump
Pump vibrates or is noisy
Foreign bodies inside the pump
Remove the foreign bodies
Pump is not correctly attached to ground
Retighten the screws
Bearing damaged
Call Salmson customer service
Motor overheats, motor protection trips
Open circuit in one of the phases
Check fuses, wiring and connections
Ambient temperature too high
Provide cooling
Mechanical seal leaks
Mechanical seal is damaged
Replace the mechanical seal
Flow is erratic
In „Constant pressure“ or „Variable pres-
sure“ mode, the pressure sensor is not
adequate
Replace with a sensor with matching
pressure range and accuracy
In „Constant pressure“ mode, the pump
does not stop if the flow is zero
The non-return valve is not tight
Clean it or replace it
The non-return valve is not adequate
Replace it by an adequate non-return
valve
Low tank capacity due to installation
Change it or add a tank to the installa-
tion
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