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ENGLISH
www.stiebel-eltron.com CK 20 Trend LCD | 21
OPERATION | INSTALLATION
Troubleshooting
Dust filter cleaning
Clean the dust filter at regular intervals. The dust filter can
be pulled out from the side of the appliance.
You may need to detach the appliance from the wall mount-
ing bracket beforehand (see chapter "Preparations/ Installa-
tion site").
D0000069514
8. Troubleshooting
Problem Cause Remedy
The appliance does
not deliver the
required heating
output.
The dust filter is heavily
soiled.
Check and, if necessary,
clean the dust filter.
Room does not get
warm enough. Ap-
pliance does not get
hot.
Temperature set too low
on the appliance.
Check the temperature set
on the appliance. Adjust if
necessary.
No power supply. Check the RCD and the fuse/
MCB in the fuse box.
Fuse has blown. Appliance cannot be re-
started.
Room does not get
warm enough al-
though the appliance
is hot.
Overheating. High limit
safety cut-out limits
heating output.
Eliminate the cause (dirt or
obstructions at the air inlet
or outlet). Observe minimum
clearances.
The heat demand of the
room is higher than the
appliance output.
Remedy heat losses (Close
windows and doors. Avoid
constant venting.)
The room gets too
hot.
The appliance tempera-
ture is set too high.
Check the selected room
temperature. Adjust if nec-
essary.
Detected room tempera-
ture does not match actu-
al room temperature.
Avoid obstructions to air
changes between appliance
and indoor air.
Window open de-
tection does not
respond.
Appliance does not detect
a pronounced tempera-
ture drop when venting.
(Window open detection
requires a previously sta-
ble room temperature.)
Wait a while after making
settings on the appliance,
until the room temperature
has fully stabilised.
Avoid obstructions to air
changes between appliance
and indoor air.
Manually switch the appli-
ance to standby mode for the
duration of venting.
Window open detection
is not enabled.
Switch on window open de-
tection in the standard menu.
"Adaptive start" func-
tion does not work as
required.
This function is only ef-
fective in timer mode.
Use the timer mode for opti-
mised heating convenience.
Severely fluctuating room
temperature or the appli-
ance learning procedure
has not been completed.
Wait a few days for the be-
haviour to stabilise.
"Adaptive start" function
is not enabled.
Switch on the "Adaptive
start" function in the stand-
ard menu.
"Err" or "E..." is dis-
played.
Internal fault detected. Notify the qualified con-
tractor.
If you cannot remedy the fault, contact your qualified contractor.
To facilitate and speed up your request, provide the number from
the type plate (000000-0000-000000).
INSTALLATION
9. Safety
Only a qualified contractor should carry out installation, commis-
sioning, maintenance and repair of the appliance.
9.1 General safety instructions
We guarantee trouble-free function and operational reliability only
if original accessories and spare parts intended for the appliance
are used.
9.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
- Install the appliance in such a way that control equipment
cannot be touched by a person in the bath or shower.
- All electrical connection and installation work must be car-
ried out in accordance with VDE regulations (DIN VDE 0100)
[or local regulations], the rules of your local power supply
utility, and relevant national and local regulations.
- Only mount the appliance on a vertical wall that is tempera-
ture-resistant to at least 85°C.
- Maintain minimum clearances to adjacent surfaces.
- Ensure the on-site cable has an adequate cross-section.
- If connecting the appliance via a socket, ensure that this is
easily accessible once the appliance has been installed.
- Never install the appliance directly below a wall socket.
- When installing the heating appliance in rooms with a bath
or shower, observe the safety zone according to VDE 0100,
section 701 [or local regulations], in accordance with the de-
tails on the appliance type plate.
- Observe the type plate. The specified voltage must match the
mains voltage.
- Observe the Building and Garage Regulations [or local
regulations].
10. Appliance description
10.1 Standard delivery
The following are delivered with the appliance:
- 1 wall mounting bracket
10.2 Accessories
- Towel holder
21


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