Subject to change · FNA1HV 005_008_016_43622600 · 0421· EN
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13
Faultfinding / troubleshooting
Problem / fault
Possible cause
Elimination
E- Motor cannot be switched on during
commissioning
›
E-cable or connector are defective
›
Missing mains voltage
›
Motor / pump are defective
›
Too high viscosity
›
Have cable replaced by a specialist
›
Provide mains voltage or activate
electric fuse
›
Replace motor / pump (repair at
manufacturer‘s premises)
›
Heat medium
Electric motor switches off during
operation
›
E-motor is overheated
›
Pump is blocked
›
Allow engine to cool down, clean
ventilation slits if necessary
›
Replace pump (repair at manufacturer‘s
premises)
Flow rate is significantly too low
›
Filter element is clogged
›
Suction strainer is clogged
›
Viscosity is too high
›
Suction height is too great
›
Leak on suction side
›
Pump is worn
›
Replace filter element
›
Replace suction strainer
›
Heat medium
›
Adjust suction height
›
Replace suction hose or seal the
connection points (tighten them)
›
Replace pump (repair at manufacturer‘s
premises)
Too loud operating noise
›
Filter element is clogged
›
Suction strainer is clogged
›
Viscosity is too high
›
Suction height is too great
›
Leak on suction side
›
Filter unit is mounted on a vibration-
sensitive surface (e.g. metal sheet)
›
Replace filter element
›
Replace suction strainer
›
Heat medium
›
Adjust suction height
›
Replace suction hose or seal the
connection points (tighten them)
›
Improve local conditions
Pump does not suck in fluid
›
Leak on suction side
›
Filter unit is running dry (with new
filling)
›
Replace suction hose or seal connection
points (tighten them)
›
Pre-fill the unit (0,3 l to 3 l)
Oil on fan cover
Oil is running out of the terminal box
›
Sealing ring is leaking
›
Residual oil at housing after filter
element change
›
Screw connection is leaking
›
Replace motor or have it repaired at
manufacturer‘s premises
›
Clean off-line filter unit
›
Check screw connections, tighten / seal
them if necessary
Table 11: Fault table