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INSTALLATION
Maintenance
14. Maintenance
WARNING Electrocution
Before any work on the appliance, disconnect all poles
of the appliance from the power supply.
f Dismantle the appliance for maintenance work.
14.1 Draining the appliance
WARNING Burns
Hot water may escape during draining.
f Drain the appliance via its connectors.
14.2 Opening the appliance
f Pull off the temperature selector.
f Remove the screws from underneath the temperature
selector.
f Open the appliance cover by lowering the bolt screws in-
wards and pivot the cover upwards, then remove it.
14.3 Descaling the appliance
Material losses
!
Never treat the cylinder surface with descaling agents.
f Remove the flanged immersion heater.
f Carefully tap the heating element to remove coarse limescale
deposits.
f Immerse the heating element up to the flange plate in desca-
ling agent.
14.4 Replacing the power cable
The power cable must only be replaced by a qualified contractor
with an original spare part. Alternatively, the H05VV-F3x1.0 cable
may be used.
Note
Never remove the plastic thread holding the profile plate.
18
| ESH 10 U-N Trend | ESH 10 O-N Trend
14.5 Checking the earth conductor
f Pull off the temperature selector.
f Check the earth conductor (in Germany DGUV V3 for exam-
ple) across a temperature controller fixing screw and the
earth conductor contact of the power cable.
14.6 Positioning the temperature sensor in its
protective pipe
ESH 10 U-N Trend
f When replacing the temperature controller, guide the tem-
perature sensor into its protective pipe.
185
f Secure the temperature sensor in place below the earthed
plug.
ESH 10 O-N Trend
f When replacing the temperature controller and the high limit
safety cut-out, guide the temperature sensors into the pro-
tective pipe.
L1
Temperature controller
L2
High limit safety cut-out
ESH 10 O-N Trend
L2
L1
L1
260
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L2
130
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