Replacing componentsInstallation and maintenance instructions ecoTEC exclusive 0020017768_07 571010.4 Replacing primary heat exchangera Danger!Risk of personal injury and/or materialdamage as a result of improper installation!You need to follow the corresponding safetyinstructions in order to safely replace thecomponent.> Before replacing the component, complywith the safety instructions in section 10.1.> Disconnect the appliance from the mains as describedin Section 10.1, and close the gas cock in the gassupply pipe.> Close the maintenance cocks - if fitted - in the heatingflow and return and drain the appliance.> Dismantle the compact thermo module as describedunder Section 8.3.1.123456Fig. 10.4 Fig. 10.4 Replacing primary heat exchanger> Remove the clamps (4) on the trap (3), release thefittings on the trap and remove the trap from the pri-mary heat exchanger.> Remove the adaptor nuts of the trap from the pri-mary heat exchanger.> Release the return connection (6) and the feedconnection (5) on the primary heat exchanger.> Release the three screws (2) on the primary heatexchanger and remove the primary heat exchangerfrom the appliance.> Mount the new primary heat exchanger in reverseorder and replace the seals.> Fill and bleed the appliance and if needed, the plantafter installing the new primary heat exchanger.> After completing the work, check for gas and waterleaks and perform a function check (see Section 6).10.5 Replacing electronics and displaya Danger!Risk of personal injury and/or materialdamage as a result of improper installation!You need to follow the corresponding safetyinstructions in order to safely replace thecomponent!> Before replacing the component, complywith the safety instructions in section 10.1.> Comply with the assembly and installation manualsprovided with the spare parts.Replacing display or electronicsIf you are replacing only one of the two components, theparameter adjustment functions automatically. On turn-ing on the appliance, the new component takes over thepreviously set parameters from the components that arenot replaced.Replacing display and electronicsWhen replacing both components (spare part case), afterbeing turned on, the appliance goes to fault and displaysthe error message F.70.> In the second diagnosis level, under the diagnosispoint “d.93“ enter the number of appliance variantaccording to Table 10.1 (see Section 9.1.2).The electronics is now set to the appliance type and theparameters of all adjustable diagnosis points correspondto the factory settings.Appliance Number of the appliance variantecoTEC exclusive 832 4ecoTEC exclusive 838 5Table 10.1 Numbers of the appliance variants