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Troubleshooting (users)
9.2
Opening the appliance
D0000105871
u Turn the temperature selector anti-clockwise as far as it will
go.
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 and pivot the appliance cover 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 power cable must only be replaced by a qualified
contractor with an original spare part.
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.
16
| SNU 10 Plus
D0000105874
10 Troubleshooting (users)
Problem
Cause
The appliance does not
The temperature se-
supply hot water.
lector is rotated anti-
clockwise as far as it
will go.
No voltage at the ap-
pliance.
Water can only be
The aerator in the tap
drawn at a reduced
is scaled up.
rate.
Loud boiling noises in-
The appliance is scaled
side the appliance.
up.
u If you cannot remedy the fault, contact your qualified con-
tractor.
u To facilitate and speed up your enquiry, please provide the
contractor with the number from the type plate
(000000-0000-000000).
11 Troubleshooting (installers)
Problem
Cause
The appliance does not
The high limit safety
supply hot water.
cut-out has tripped.
Loud boiling noises in-
The appliance is scaled
side the appliance.
up.
12 Shutting down the system
u Isolate the appliance from the power supply by removing
the plug or by tripping the MCB in the distribution board.
u Drain the appliance (see chapter "Maintenance (qualified
contractors) / Draining the appliance").
185
Remedy
Switch the appliance
on by turning the tem-
perature selector.
Check the plug/fuses
in the distribution
board.
Descale/replace the
aerator.
Have the appliance de-
scaled by a qualified
contractor.
Remedy
Remedy the cause of
the fault. If necessary,
replace the temperat-
ure controller. Allow
the appliance to cool
down. If you have isol-
ated the appliance
from the power sup-
ply, the high limit
safety cut-out will be
reset automatically.
Descale the appliance.
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