Ariston Thermo SL2 20 LUX WI-FI 2.5 FE, Manual

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To work on thermostat remove it from the housing and disconnect it from the
mains.
To work on the heating element, first empty the appliance by closing the
mains tap and allow the water to flow from inside the same through the
supply pipe after having opened the emptying tap and opening the hot water
tap.
In the case of the models with self - locking flange, remove the nut, then the
flange fixing bracket and push the flange outwards from the inside and
remove it with a semi-circular movement.
when remounting, remember to replace the flange gasket, the thermostat
and the heating element into their original position. When removing the
above, we recommend replace the flange gasket.