Insufficient or no coolant flow
Coolant level too low
Top up coolant
Constriction or foreign body in cooling circuit
Remove constriction or foreign body
Coolant pump fuse defective
Replace coolant pump fuse
Coolant contaminated
Change the coolant
Coolant filter displaced when connecting coolant return
Clean coolant filter using clean tap water or change filter element
Coolant pump is jammed (FK 4000 R, FK 4000 R US and FK 4000 Rob
only)
Turn coolant pump shaft (see operating instructions, "Turning coolant pump
shaft" section). Contact after-sales service if the coolant pump shaft proves
impossible to turn
Coolant pump defective
Contact after-sales service
Permitted duty cycle exceeded
Wait until the end of the coolant pump cooling phase
Flow sensor has tripped, requesting parameter F3 from the welding system
shows that there is nothing flowing through: Coolant pump defective
Contact after-sales service
Flow sensor has tripped, requesting parameter F3 on the power source
shows that there is still a small amount flowing through: coolant hoses
kinked or coolant filter displaced when connecting coolant return
Repair coolant hoses, clean coolant filter using clean tap water or change
filter element
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Insufficient cooling power
Faulty fan
Contact after-sales service
Coolant pump defective
Contact after-sales service
Cooler contaminated
Gas purge cooler with dry compressed air
Cooling capacity of connected cooling unit not high enough
Use a cooling unit with a greater cooling power
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45
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