- 11 DangerRisk of injury! The main switch of the vacuum cleaner is to beswitched off or the Cekon plug must be unplugged while carryingout any repairs or maintenance jobs.*NotePress unlocking key for exhaust gas thermostat (J) to unlock theflame monitoring mechanism.TroubleshootingFault Possible cause Remedy of whomMachine is not running; indi-cator lamp for operationsstand-by (F) is not glowingThere is no voltage in the machine. Check electrical mains. ElectricianSafety time switch is on. Switch off the appliance switch briefly andswitch it on again.OperatorFuse in the control circuit (F3) hasburnt off. Fuse is located in thecontrol transformer (T2).Install a new fuse; if it burns out again, thenremove the cause for the over-loading.Customer ServicePressure switch HP (High pres-sure) or LP (Low pressure) is de-fective.Check pressure switch. Customer ServiceTimer module (A1) defective. Check connections, replace if required. Customer Service+ Indicator lamp for engineover-heating (G) is glowingThermal sensor (WS) in the engineor the over-current protectionswitch (F1) has got activated.Rectify cause for over-loading. Customer ServiceThe water shortage safeguard inthe swimmer tank has got activat-ed.Remove the water shortage. OperatorBurner does not ignite or theflame glows off during opera-tionThermostat (B) has been set at avery low temperature.Set the thermostat to a higher level. OperatorMachine switch is not positioned toburnerSwitch on the burner. OperatorThe water shortage safeguard inthe safety block has got switchedoff.Ensure adequate water supply. Check ma-chine for leaks.OperatorClose the gas valve. Open gas valve. OperatorThe maximum temperature limiterin the water outlet (> 110 °C) hasgot triggered.Let the boiler cool down and restart the appli-ance.OperatorCheck thermostat. Customer ServiceIndicator lamp for exhaustgas thermostat (K) is glowingNo gas supply. Open the gas supply. OperatorThe incoming supply or exhaust airoutlet has got blocked.Check ventilation and exhaust system. OperatorBoiler floor is too hot. The maxi-mum temperature limiter in theboiler floor (> 80 °C) has got trig-gered. No condensate water in theboiler.Add 5 litre water via the measuring nozzle forexhaust gas.OperatorAutomatic gas firing system isshowing interruption.Press the unlocking key for the gas relay (I). OperatorNo ignition. * Check electrodes distance between gas fir-ing system and ignition cable. Rectify the dis-tance or replace defective parts. Clean it, ifnecessary.Customer ServiceBlower or speed control plate is de-fective. *Check blower and speed control plate. Re-place plug and cables. Replace defectiveparts.Customer Service33EN

safety instructions

electrical connection

elektrische aansluiting

Kärcher HDS 9/16-4 ST Gas Instructions Manual