Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual

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Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual Manual pdf 27 page image

Troubleshooting 90020029173_04 ecoTEC plus Installation and maintenance instructions 278.9 Installing the compact thermal module123456789101. Connect the compact thermal module (6) to the heatexchanger (1).2. Tighten the six nuts (4), including the retainer for theair intake pipe, in a cross-wise pattern until the burnerflange fits closely and uniformly onto the mating sur-faces.3. Check that the blue sealing ring in the air intake pipe ispositioned correctly in the seal seat.4. Place the air intake pipe (2) on the intake manifold, andtighten the screw (3).5. Connect the ignition line and the ground connection tothe ignition electrode (5).6. Connect the cable (7) from the connection plug in thesupply line to the fan motor, the PWM signal cable tothe underside of the fan (8) and the cable to the gasvalve (10).7. Connect the gas line (9) using a new seal. In the pro-cess, secure the gas pipe against twisting.8. Open the gas isolator cock.9. Make sure that there are no leaks.8.10 Draining the product1. Close the service valves of the product.2. Open the drain valves on the service valves.3. Ensure that the automatic air vent cap on the air separ-ator is open so that the product can be drained fully.8.11 Checking the pre-charge pressure of theexternal expansion vessel1. Depressurise the heating installation.2. Measure the pre-charge pressure of the expansion ves-sel at the vessel valve.3. Fill the expansion vessel with air at a pre-charge pres-sure of less than 0.075 (0.75 bar) according to the statichead of the heating installation.4. If water escapes from the valve of the expansion ves-sel, you must replace the expansion vessel.8.12 Completing inspection and maintenancework▶ If required, reset the maintenance interval (→ Page 23).▶ Check that the product works correctly and is leak-tight,see "Checking function and leak-tightness" (→ Page 21).9 TroubleshootingYou can find an overview of the fault codes in the appendix.Overview of fault codes (→ Page 34)9.1 Contacting your service partnerIf you contact your service partner, if possible, please men-tion– the fault code that is displayed (F.xx),– the product status (S.xx) that is displayed.9.2 Calling up status codesYou can find an overview of the status codes in theappendix.Status codes – Overview (→ Page 33)▶ To call up the display of the status codes, press .◁ The display shows the status code, e.g. S.4 for"Burner mode: Heating".▶ To exit the status codes display, press or do not pressany button for approximately four minutes.◁ Depending on the settings, the current flow temperat-ure or current water pressure of the heating installa-tion reappears in the display.9.3 Reading off the fault codesIf a fault develops in the product, the display shows a faultcode F.xx.Fault codes have priority over all other displays.If multiple faults occur at the same time, the display showsthe corresponding fault codes for two seconds each in se-quence.▶ Rectify the fault.▶ To restart the product, press (→ Operating instruc-tions).▶ If you are unable to remedy the fault and the fault recursdespite several fault clearance attempts, contact Cus-tomer Service.