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4. MAINTENANCE AND REPAIR WORKS
All maintenance and repair works should be carried out by a competent person only in conformity with the safety
norms and with any provisions set forth in this manual.
4.1. Water Drain
If there is a chance that the ambient temperature drops below 0°C in the room where the appliance is installed, drain water
from the water heater.
To do this, the following steps should be done:
4.1.1. Disconnect the appliance from the electrical supply;
4.1.2. Make sure that the water in the appliance is of safe temperature;
4.1.3. Turn o the tap of cold water supply to the water heater;
4.1.4. Turn on the hot water domestic mains tap for discharge of pressure inside the tank;
4.1.5. Turn on the tap (D in Fig. 1) to allow air into the tank. If it is absent, remove the supply tube to the hot water pipe of the
water heater (marked with the red collar);
4.1.6. Connect drain hose directed into the sewer to the drain cock (B in Fig. 1) and open it. If there is no a "T" piece union
with the drain cock, remove the supply pipe to the cold water inlet of the water heater (marked with the blue collar), connect
drain hose directed to the sewer to the cold water inlet;
4.1.7. After draining, make sure there is no water inside the water heater.
Freezing of water inside the water heater leads to irreversible changes and defects.
It invalidates all warranty liability on the part of the manufacturer.
4.2. Replacing internal parts
Disconnect the water heater from the electricity supply. Remove the appliance cover.
• For models featuring a user interface as represented in figures 6 and 8:
To replace the electronic thermostat (Ref. T), disconnect the power supply cable (Ref. C) and the control panel wires (Ref. Y).
Next, remove it from its slot, taking care not to bend the sensor support rod (Ref. K) too much.
To replace the control panel (Ref. W), disconnect the wires (Ref. Y) and loosen the screws.
• For models featuring a user interface as represented in figures 7 and 9:
To replace the sensor support rod (Ref. K), disconnect the wires (Ref. F) from the P.C.B. and remove it from its slot, taking care
not to bend it too much.
To replace the control board (Ref. W), disconnect the wires (Ref. Y) and loosen the screws. To replace the power board (Ref. Z),
disconnect the cables and wires (Ref. C, Y, F and P) and loosen the screws.
During reassembly, please, make sure that all components are put back in their original positions.
Prior to work, the water heater must first be emptied. For models fitted with a surge protection flange, remove the nut (D in
Fig. 7) and remove the bracket fixing the flange in place (S in Fig. 7), then press the flange (F in Fig. 7) inwards and remove it
with a semicircular movement.
For other models, loosen the 5 nuts (C in Fig. 8) and remove the flange (F in Fig. 8). The heating element and anode are
attached to the flange. During reassembly, make sure that the flange gasket, the thermostat and the heating element are put
back in their original positions. We recommend the flange gasket is replaced every time it is removed.
Only use original spare parts.
4.3. Periodical maintenance
4.3.1. Magnesium anode
The magnesium anode is an integral part of the protection system of water tank against corrosion. Given that aggressive
properties of water cause faster wear of the magnesium anode, conditions of the magnesium anode should be checked
ANNUALLY. In case of severe wear, the magnesium anode must be replaced. The warranty for water-containing tank with the
worn magnesium anode (residual volume is less than 30%) is not valid. To replace the anode, disassemble the heating
element and unscrew from the support bracket.
The magnesium anode should be replaced at least 1 in 24 months (excluding the water heater with the inner tank of stainless
steel).
The magnesium anode is a consumable item that cannot be replaced under warranty.
Following the rules of scheduled maintenance will allow you to ensure a long life of the water heater.
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