Resetting The High Limit Safety Cut-Out; Maintenance And Cleaning; Removing The Heating Element Cover; Draining The Tank - Stiebel Eltron SB 300 E Mode D'emploi

INSTALLATION

Maintenance and cleaning

13.1 Resetting the high limit safety cut-out

The high limit safety cut-out protects the appliance from overheat-
ing. The cut-out switches off the electric element when the tank
water temperature exceeds 199–208 °F (93–98 °C).
Once the cause of the failure has been removed, press the reset
button of the high limit safety cut-out on the rod thermostat. To
do so, remove the appliance cover.
14. Maintenance and cleaning
WARNING
Prior to all work on the appliance, isolate it from the
power supply.

14.1 Removing the heating element cover

Undo the screws that fasten the heating element cover to the
appliance.
Pull off the cover.
Note
Refit the heating element cover after completing your
work.
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14.2 Draining the tank

To drain the DHW tank, e.g. when shutting the appliance down,
proceed as follows:
Unplug the appliance from the power supply.
Close the shut-off valve in the cold water supply line.
The DHW tank is drained via the cold water supply line.
Thermal safety
Open the drain valve installed in the cold water supply line
cut-out
(See 10.1, "Water connection", pg. 8). If no drain valve
has been installed, undo the cold water supply line at the
"cold water inlet" connection.
Open one tap in one sink.
Some residual water will remain in the lower section of the DHW
tank.

14.3 Descaling the electric element

Only descale the flange of the electric booster heater after re-
moving it, and never treat the interior of the DHW tank and the
sacrificial anode with descaling agents.

14.4 Valves

Regularly check the system's valves (safety valve, pressure reduc-
ing valve, drain valve, vacuum breaker, mixing valve), to ensure the
operational reliability of the appliance. The amount of limescale
deposits depends on the local water quality.
Check all valves in the system and remove limescale deposits.
Replace the valves if necessary.
Check the function of the valves.
Whether a sand filter is installed.

14.5 Replacing the electric element cover

Place cover back in its original position.
Secure the screws holding the cover onto the appliance.
WARNING Burns
Hot water may escape when draining the DHW tank.
WARNING
Reconnect the earth cable to the appliance cover.
SB 300-400 E | 11