12. MaintenanceOnce per year, the appliance must be checked, cleaned and, if necessary, repaired by a competent installer in the field of gas heating and electricity. At least check that the appliance is working properly and safely.3-Always close the gas tap during maintenance work.-Check the gas tightness after repair.-Make sure there is no voltage on the appliance.-SS-absolutely do not clean the concentric system (internally) with a steel brush or metal sponge, for example.This will damage the oxide skin and could lead to leaks in the system as a result of pitting corrosion.1Clean the glass pane(s), if necessary.3-Only clean a glass pane once it has reached room temperature.-Do not use the appliance when a glass pane is broken and/or cracked, until it has been replaced as described from section 8.1.3-Avoid damage to the glass pane(s).-Avoid/remove fingerprints on the glass pane(s), since otherwise they will burn into the surface.-Clean the pane(s) as described in the user manual.-Regularly remove accumulated dirt, as it can burn into the glass.1Inspect the flue gas discharge system.3You must always perform a final inspection.1Perform the inspection as described in chapter 10.12.1 PartsComponents that have to be replaced are available at the supplier.Installation manual49
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