Troubleshooting diagramPROBLEM POSSIBLE CAUSE REMEDYThe cooling unit doesn´t work.The cooling unit doesn´t start by the testswitch.The missing coolant pressure warninglamp H001 is on..The coolant will not circulate by the testswitch SW301.The coolant doesn´t return to thereservoir.Fuse F002, 2A has burnt.Faulty aux. Transformer T005.Faulty control card A005.Coolant level too low.A faulty pressure switch S002.Pressure switch limit (approx.1bar.)incompatible with the torch.Pump motor start capacitor C004 faulty.A faulty control card A005.The system has an air bubble blockingthe circulation. Coolant level too low.A leak in the system.Check / replace the fuse as necessary.Check the aux. Transformer T005primary and secondary voltages. Checkthe filter card Z004 (2500W).Check the control card A005.Check the coolant level.Check the voltage over the pressureswitch from control card A005 betweenX2/1 and X2/8; Pressure = 0V, nopressure = 24V.Re-adjust the pressure switch limit:1. Run the pump with the test switchSW301 during adjustment.2. After 5 seconds turn the adjustmentscrew carefully, until the lamp H001goes off.3. Check the result by welding.Check / replace capacitor.Check / replace the A005.Check the coolant level in the reservoir.Hint: Blow compressed air into thereservoir. The filler neck can be blockby hand.Check all hoses and connections in thesystem.TIG HF-ignition doesn´t work. A faulty TIG -torch.A faulty auxiliary transformer T002.A faulty control card A004.Check and fix the TIG-torch(consumable parts / electrode).Check the aux. Transformer T002secondary voltages from control cardA004´s connectors X2/1=0V andX2/3=360V. Replace T002 asnecessary.Check the spark on / off -control fromcontrol card A004 connector X3/5.AC TIG-welding doesn´t work. Th e arcdies after a short period of welding.A faulty control card A003. Check / replace control card A003.In AC-welding the second half-cycle ismissing. DC+ or DC- method isinoperative.A faulty control card A003.A faulty secondary unit; IGBT or diodecards.Check if the process is changed oncontrol card A003. Replace the card asnecessary.Check / replace secondary unit faultycomponents.37