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11. Maintenance and cleaning
By a professional only!
Applicable to all maintenance work:
• Disconnect unit from the mains
circuit.
• Disconnect cold and hot water pipes from unit.
• Remove unit, drain via the cold and hot water connection pieces and place on
a table.
1
To open the housing lid
1. Pull off the thermostat knob (1).
2. Loose the four screws: two on the top and two at the bottom (2).
3. Loose screw in the knob.
4. Remove the front housing lid (3).
5. The unit is now accessible for all additional maintenance work. Assembling is done
in reversed order.
Decalcification
2
The outlet pipe can be cleaned by means of usual decalcifier or vinegar. Please observe
manufacturer instructions when using decalcifier. In case water flows considerably
slowly when the hot water tap is opened the storage heater and the tap must be
decalcified by a professional. In case of permanent calcification an incorrect pressure
could develop inside the unit.
On the heating element and on the interior of the boiler scale is separating. The clean-
ing interval depends on the water hardness and the operating time of the appliance.
We suggest to clean the water storage heater after two years.
The appliance and the fittings should only be cleaned with a damp cloth. Do not
use abrasive or chlorine-based cleaning agents or solvents.
Faults to be cleared by an approved professional
3
If the safety cut out operates by using the water heater normally, the reason for the
fault must rectified and the thermostat must be replaced.
15
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