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- 21 -
Maintenance by a qualified professional
To protect the performance of your appliance for many years to come, it must be checked by a
professional every 2 years.
Switch off the electric power supply (circuit breaker, fuses, etc.).
Drain the tank:
close the cold water inlet (isolating valve),
open a hot water tap,
set the safety valve to the drain position.
Remove the front cover.
Disconnect the wires from the terminals of the thermostat.
Remove the heating assembly.
Remove any scaling that is deposited in the shape of sludge or a film on the floor of the tank and
thoroughly clean the ducts of the heating elements and the thermostat. Do not scratch or strike the scaling
on the walls, or you might damage the coating. Any residue can be removed using a water and dust
vacuum cleaner.
Clean the interior of the sheath to remove any scaling.
The anti-corrosion anode is made of titanium and does not need to be inspected or replaced.
Install the heating assembly with a new seal. Tighten the nuts gradually to a reasonable torque. Alternately
tighten nuts that are opposite one another.
Fill the water heater, with a hot water tap open. When the water reaches the hot water tap, the tank is full.
Check the seal for leaks and then install the thermostat and its support and connect the electric power
supply.
On the following day, check the seal again for leaks and slightly tighten the bolts, if necessary.
Check the electric connections.
Check that the temperature sensor is properly positioned in the pocket near the electric backup. The
sensor must be fully inserted in the pocket.
Evaporator:
Check that the evaporator and the fan are clean once a year. If these parts are soiled, the performance of
the heat pump will be diminished.
To access the evaporator, remove the cover by unclipping it with a screwdriver. The left half-shell can also
be removed in cases of difficult access.
If necessary, clean the evaporator and the fan with a soft brush. Brush the evaporator very carefully to avoid
damaging the vanes. If the vanes are folded, straighten them using a suitable comb.
Always switch off the appliance before opening the front cover or the top cover
Expansion valve:
Only personnel specialised in refrigerating systems can access the adjusting screw of the expansion valve.
Adjusting the expansion valve without the manufacturer's approval may result in the product warranty being
cancelled.
In general, you are advised not to touch the settings of the expansion valve without having first tried all the
other repair solutions.
Condensate evacuation tube
Check that the condensate evacuation tube (item 12 on page 5) is clean. Local pollution by dust can result
in deposits in the condensate catch tray. These deposits may block the condensate evacuation tube,
resulting in the excessive accumulation of water in the tray, which can cause malfunctions.
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