10.5.2 Removing the inspection hatch
Checking operations such as descaling and checking the magnesium
anode require the domestic hot water tank to be drained and the
inspection hatch removed.
Fig.51
230V
3
7
8
9
5
6
4
2
MW-2000405-3
1. Drain the domestic hot water tank.
2. Remove the lower cover by unscrewing the mounting screws and
sliding it along the cables.
3. Unclip the anode wire from the magnesium anode.
4. Disconnect the temperature sensor without removing it.
5. Remove the temperature sensor wire from the plate.
6. Disconnect the phase and neutral of the thermostat.
7. Disconnect the earth wire.
8. Remove the inspection hatch.
8.1. Mark the position of the tab with a marker.
8.2. Mark the position of the round terminal of the anode wire with a
marker.
The anode wire remains fitted to the safety terminal in the domestic
hot water tank cover.
9. Discard the used gasket.
For more information, see
Draining the domestic hot water tank, page 48
10.5.3 Descaling the domestic hot water tank
In areas of hard water, descale the domestic hot water tank once a year.
This descaling operation ensures the performance of the domestic hot
water tank is maintained.
Descale the domestic hot water tank after its first year of use, and then
every two years. If the domestic hot water tank has a scale build up within
two years, increase the descaling interval.
1. Drain the domestic hot water tank.
2. Remove the inspection hatch.
3. Check the scale build up in the domestic hot water tank.
10 Maintenance
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