Operating Manual geoTHERM VWS 0020045200_00245.7 Starting up the heat pumpThe start-up of your heat pump was carried out afterinstallation by your expert technician company.A repeated start-up will not even be necessary in theevent that your heat pump disconnects from the mainsunexpectedly, for example as a result of a voltage drop(power cut, circuit breaker defective, circuit breaker de-activated). Your geoTHERM heat pump has an automat-ic reset function, i.e. the heat pump reverts automatical-ly to its starting condition, provided no fault is presentin the heat pump itself. Find out what to do in the eventof a fault in Chap. 5.10.5.8 Shutting down the heat pumpA shutdown of the heat pump is only possible via theoperating panel by deactivating heating and hot watergeneration in the respective menus (see Sect. 5.4, UserLevel Displays ).h Note!Should it be necessary to remove allelectric power from the heat pump in-stallation, then switch off the circuitbreaker on your heating system.5.9 InspectionAn annual inspection/maintenance of the unit by a spe-cialist is a prerequisite for continuing operational safety,reliability and a long working life.d Danger!Inspections/Maintenance work not car-ried out can result in damage to proper-ty and personal injury.Have the inspection, maintenance andrepairs carried out only by a recognisedexpert technician company.Only genuine Vaillant spare parts may be used for in-spections, maintenance and repair work to ensure theperfect long-term working order of all functions of yourVaillant appliance and to prevent the approved seriescondition from being changed.Any spare parts which might be required are listed inthe relevant current spare parts catalogues.Information can be obtained from Vaillant CustomerService Centres.5.10 Troubleshooting and diagnosis5.10.1 Error messages on the controllerError messages appear ca. 20 seconds after the errorhas occurred on the display and are written in the errormemory of the controller when the error has beenpresent for ca. 3 min. where the engineer can view it ata later date.Error History I1Fault number >1Fault code 4116.02.08 07:18Error CH circuitSensor T3 heat sourceFig. 5.3 Error message in the error memory Menu I1The geoTHERM control system has various malfunctiontypes:– Malfunction of components which are connected viaeBUS.– Temporary shutdownThe heat pump remains in operation. The error is dis-played and disappears independently when the causeof the fault is removed.– Fault-induced shutdownThe heat pump is shut down. It can only be restartedafter the cause of the fault has been removed by theexpert technician and the error reset.– Moreover, other errors/malfunctions can occur onthe unit or system.a Caution!Heat pump malfunction.Immediately notify your expert techni-cian if error messages appear on the dis-play on the operating panel which arenot listed in tables 5.4 to 5.7.Do not attempt to remove the sourceof the malfunction yourself.h Note!Not all of the following listed malfunc-tions have to be dealt with by an experttechnician.If you are unsure whether you can reme-dy the fault yourself or not or if theerror occurs repeatedly contact yourexpert technician or Vaillant customerservice.5 Operation