Vaillant home combi Installation And Maintenance Instructions Manual

Vaillant home combi Installation And Maintenance Instructions Manual Manual pdf 26 page image

12 Troubleshooting26 Installation and maintenance instructions HOME 0020224355_0011.13 Installing the gas-air mixture unit1. Install the burner.2. Install the gas-air mixture unit.3. Install the air intake pipe.4. Install the flue pipe.11.14 Draining the product1. Close the service valves of the product.2. Start check programme P.05 (→ Page 16).Check programmes – Overview (→ Page 30)3. Open the drain cock.11.15 Checking the pre-charge pressure of theexpansion vessel1. Drain the product. (→ Page 26)2. Measure the pre-charge pressure of the expansion ves-sel at the vessel valve.Conditions: Pre-charge pressure < 0.075 MPa (0.75 bar)▶ Top up the expansion vessel in accordance with thestatic height of the heating installation, ideally with ni-trogen, otherwise with air. Check that the drain valve isopen when topping up.3. If water escapes from the valve of the expansionvessel, you must replace the expansion vessel(→ Page 28).4. Fill and purge the heating installation. (→ Page 18)11.16 Completing inspection and maintenancework1. Fill and purge the heating installation. (→ Page 18)2. Check the gas connection pressure (gas flow pressure).(→ Page 19)3. Check the CO₂ content. (→ Page 22)12 Troubleshooting12.1 Rectifying faults▶ If fault codes (F.XX) are present, refer to the table in theappendix for advice or use the check programme(s).Overview of fault codes (→ Page 35)Check programmes – Overview (→ Page 30)If several faults occur at the same time, the fault codes areshown alternately on the display.▶ Hold the button down for more than 3 seconds.▶ If you are unable to clear the fault code and it reappearsdespite several fault clearance attempts, contact cus-tomer service.12.2 Calling up the fault memoryThe last ten fault codes are stored in the fault memory.▶ Hold the button down for more than 7 seconds.Overview of fault codes (→ Page 35)▶ Press the button to exit this menu.12.3 Deleting the fault memory1. Delete the fault memory using the diagnostics coded.94.2. Set the diagnostics code. (→ Page 15)Overview of diagnostics codes (→ Page 30)12.4 Resetting parameters to factory settings1. Reset all parameters to the factory settings using thediagnostics code d.96.2. Set the diagnostics code. (→ Page 15)Overview of diagnostics codes (→ Page 30)12.5 Preparing the repair work1. Switch off the product.2. Disconnect the product from the power mains.3. Remove the front casing.4. Close the gas isolator cock.5. Close the service valves in the heating flow and in theheating return.6. Close the service valve in the cold water pipe.7. Drain the product if you want to replace water-bearingcomponents of the product.8. Ensure that water does not drip on live components(e.g. the electronics box).9. Use only new seals.12.6 Replacing defective components12.6.1 Replacing the burner1. Remove the gas-air mixture unit. (→ Page 23)2. Remove the burner seal.3. Remove the burner.4. Install the new burner complete with new seal on theheat exchanger.5. Install the gas-air mixture unit. (→ Page 26)12.6.2 Replacing the gas-air mixture unit1. Remove the gas-air mixture unit. (→ Page 23)2. Install the new gas-air mixture unit (→ Page 26).12.6.3 Replacing the gas valve1. Disconnect the product from the power mains.2. Close the gas isolator cock.