Kärcher HDS3.5/20 Operator's Manual

Also see for HDS 3.9/30: Operator's manual Dealer's manual

Contents

9.801-509.0 - C • Karcher Operator's Manual 23PRESSURE WASHER Troubleshooting GuideTROUBLESHOOTINGPROBLEM POSSIBLE CAUSE SOLUTIONFLOW & BURNERSWITCH ON;NO SPARK,NO PILOT GASA. No main powerB. Faulty transformerC. Faulty burner & fl ow switchD. Faulty ignition control unitWith power switch on, open trigger on spray gunand set your test meter to the 24 volt scale. Probeterminals 24V and 24V(GND). If you do not read24 volts, the problem is not the ignition system.Perform normal system checks of main power,transformer, thermostat and the limit control. If youdo read 24 volts at TH and GND, the problem is inthe ignition system. Check for loose or defectivewiring. If wiring is good, replace the ignition controlunit.HAVE SPARK,NO PILOTGAS FLOWMain gas supply turned off Set test meter to 24 volt scale.1. Be sure main gas valve (gas cock or selectorarm) is turned on.2. With gas on and system sparking, probeterminals PV and 24V(GND). If pilot gas doesnot fl ow with 24 volts at these terminals, replacegas valve.3. Probe terminals PV and MV/PV. If 24 volts notpresent, replace ignition control box.HAVE PILOTGAS, NOSPARKA. Defective ignitor/sensor and or its wiringSet test meter to ohm scale.1. Disconnect the wire from the IGN terminal onthe ignition control unit.B. Faulty ignition control unit 2. Touch one meter probe to the tip of the ignitor/sensor rod in the pilot. Touch the other probeto the quick connect at the other end of ignitor/sensor wire.3. If you have continuity from the tip of the ignitor/sensor rod to the connector and no spark, replacethe ignition control unit.4. If you do not have continuity through wireand the ignitor/sensor, check for a loose wireconnection in the wire. Repair as needed.5. Check to see if spark shorts to burner ringthrough a cut in the ignitor wire.