Faults, Causes And Remedies - Wilo HELIX VE 1-Serie Einbau- Und Betriebsanleitung

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.
Fault
Pump does not operate
Pumps is running but output is insuffi-
cient
Pump output is erratic
Pump vibrates or is noisy
Motor overheats, motor protection trips
Mechanical seal leaks
The flow is irregular
In mode 2, the pump does not stop if the
flow is zero
If the fault cannot be resolved, please
contact the Wilo customer service.
Installation and operating instructions -
Possible causes
No current
Thermistor tripping device has tripped
cutting offpower
Incorrect direction of rotation
Parts of the pump are obstructed by for-
eign bodies
Air in suction pipe
Suction pipe too narrow
Valve opening is insufficient
Air inside the pump
Foreign bodies inside the pump
Pump is not correctly attached to ground
Bearing damaged
Open circuit in one of the phases
Ambient temperature too high
Mechanical seal is damaged
In Mode 2, the pressure sensor is not
adequate
The non-return valve is not tight
The non-return valve is not adequate
The tank has low capacity due to the
installation
WILO-HELIX VE 1~
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.
Faults must be remedied by qualified personnel
only!
Observe the safety instructions in section 9
Maintenance!
Remedies
Check fuses, wiring and connections
Eliminate any cause of overloading of the
motor
Check the direction of rotation of the
motor and correct it if necessary
Check and clean the pump
Seal the suction pipe so that it is airtight
Install a larger suction pipe
Open the valve properly
Vent the pump; check that the sucti-
on 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
Remove the foreign bodies
Retighten the screws
Call Wilo customer service
Check fuses, wiring and connections
Provide cooling
Replace the mechanical seal
Put a sensor with conforming pressure
scale and accuracy
Clean it or change it
Replace it by an adequate non-return
valve
Change it or add an other one on the
installation
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