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Cooling capacity too low
Cause: Fan defective
Remedy: Replace fan
Cause: Cooling pump defective
Remedy: Replace coolant pump
Cause: Cooler contaminated
Remedy: Clean cooler with dry compressed air
Cause: Cooling capacity of cooling unit too low
Remedy: Use cooling unit with higher cooling capacity
High operating noise level
Cause: Coolant level too low
Remedy: Refill coolant
Cause: Cooling pump defective
Remedy: Replace coolant pump
no l H2O
The flow watchdog (option) or flow sensor in the cooling unit has tripped. The error mes-
sage is displayed on the operating panel of the power source.
Cause: Cooling flow error
Remedy: Check cooling unit; if necessary, refill coolant and purge water flow line ac-
cording to the Chapter “Start operation of the cooling unit“
Cause: Water filter clogged
Remedy: Clean or replace water filter
hot l H2O
The thermal controller of the cooling unit has responded. The error message is displayed
on the operating panel of the power source.
Cause: Excessive coolant temperature
Remedy: Wait the cooling-down time until hot | H2O is no longer displayed.
ROB 5000 or fieldbus coupler for robot control: before welding is started
again, reset signal “source error reset“.
Welding torch excessively hot
Cause: Welding torch dimensioned insufficiently
Remedy: Pay attention to duty cycle and load limits
Cause: Only with water-cooled systems: water flowrate too low
Remedy: Check water level, water flowrate, water contamination etc., coolant pump
blocked: rotate coolant pump shaft by means of screw driver (2)
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