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Troubleshooting (users)
u Allow the appliance to drain into a sink with the water con-
nections pointing downwards.
u Lightly shake the appliance to aid draining.
9.2
Opening the appliance
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u Fully turn the temperature selector anti-clockwise.
u Pull off the temperature selector.
u Remove the two screws behind the temperature selector.
u Pull off the limiting ring.
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u Insert a small screwdriver into the openings at the bottom
and carefully lift the appliance cover slightly.
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u Push down on the appliance cover, hinge it upwards and
remove it.
9.3
Descaling the appliance
NOTICE: Never treat the cylinder surface with descaling agents
as these can damage the plastic.
u Open the appliance.
u Remove the flanged immersion heater.
u Carefully tap the heating element to remove coarse limes-
cale deposits.
u Immerse the heating element up to the flange plate in de-
scaling agent.
u Carry out descaling in accordance with the instructions
provided by the descaling agent manufacturer.
u After descaling, flush the heating element with clear water.
Reassemble the appliance.
9.4
Checking the earth conductor (DGUV V3)
u Pull off the temperature selector.
u Check the earth conductor (in Germany DGUV V3 for ex-
ample) across a limiting ring fixing screw and the earth
conductor contact of the connecting cable.
9.5
Replacing the connecting cable
NOTICE: The connecting cable must only be replaced with an
original spare part by a qualified contractor.
16
| SNU 10 Plus
9.6
Positioning the temperature sensor in its
protective pipe
u When replacing the temperature controller, guide the tem-
perature sensor into its protective pipe.
u Secure the temperature sensor in place below the earthed
plug.
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10 Troubleshooting (users)
Problem
Cause
The appliance does
The temperature se-
not supply hot wa-
lector is rotated
ter.
anti-clockwise as far
as it will go.
No voltage at the
appliance.
Water can only be
The aerator in the
drawn at a reduced
tap is scaled up.
rate.
Loud boiling noises
The appliance is
inside the appliance.
scaled up.
u If you cannot remedy the fault, contact your qualified con-
tractor.
u To facilitate and speed up your enquiry, please provide the
qualified contractor with the number from the type plate.
11 Troubleshooting (qualified con-
tractors)
Problem
Cause
The appliance does
The high limit safety
not supply hot wa-
cut-out has tripped.
ter.
Loud boiling noises
The appliance is
inside the appliance.
scaled up.
12 Shutting down the system
u Isolate the appliance from the power supply by removing
the plug or by switching off the MCB in the distribution
board.
u Drain the appliance (see Draining the appliance [} 15] ).
185
Remedy
Switch the appliance
on by turning the
temperature se-
lector.
Check the plug/fuses
in the distribution
board.
Descale/replace the
aerator.
Have the appliance
descaled by a quali-
fied contractor.
Remedy
Remedy the cause of
the fault. If neces-
sary, replace the
temperature con-
troller. Allow the
appliance to cool
down. If you have
isolated the appli-
ance from the power
supply, the high
limit safety cut-out
will be reset auto-
matically.
Descale the appli-
ance.
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