Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual

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Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual Manual pdf 33 page image

Troubleshooting 100020261389_02 ecoTEC plus Installation and maintenance instructions 3343211. Disconnect the test system's silicone pipe for checkingthe airflow rate (1).2. Undo the fixing screw (2) and remove the air intake pipe(3) from the intake stub.3. Unscrew the union nut (4) from the gas valve assembly.2354 1674. Pull out the plugs (1), (2), (3), (4) and (5).5. Undo the three screws (7) between the mixture pipeand the fan flange.6. Replace the seal (6).31247. Remove the entire unit from the fan, Venturi and gasvalve assembly.8. Undo the nuts (1) on the gas valve assembly.9. Remove the clip (2).10. Undo the fixing screws (4) on the gas valve assembly'sretainer.11. Remove the gas valve assembly (3) from the retainer.12. Replace the gas valve assembly if it is defective.124313. Remove the retainer (2) for the gas valve assembly. Todo this, undo the three screws (1).14. Undo the fixing screws (3) for the Venturi.15. Remove the Venturi (4).16. Replace the Venturi if it is defective.17. Replace the fan if it is defective.