STIEBEL ELTRON DHF 12 - 24 C 01.10.2006 - 31.03.2007 - Manual (Page 16)

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Fault Cause Remedy
Unit does not switch on. – Water pressure in cold water pipe too
low.
– Descale or replace showerhead/Perlator®.
4. Fault finding
- qualified installer
– Strainer in 3-way valve (6) fouled. – Clean strainer ( D , 22).
Differential pressure switch (10, control
valve MRC) with flow rate controller does
not switch on in spite of the hot water tap
being turned fully on.
– Clean strainer ( D , 22). – Necessary switch-on quantity to switch on
the heating output is not reached.
– Check water pressure.
Recycling of obselete appliances
Appliances with this label must not
be disposed off with the general
waste. They must be collected
separately and disposed off according to local
regulations.
6. Environment and
recycling
5. Guarantee
Unit does not produce hot water in spite of
an audible switch-on noise by the differential
pressure switch.
– Safety temperature limiter (12) has
tripped, possibly due to:
– Check intlet temperature. a) Intlet temperature too high.
b) Control valve (MRC) faulty.
– Check and if necessary replace control
valve. Rinse heating-system of unit, in
order to avoid over-heating. Press reset
button (13).
For guarantees please refer to the pespective
terms and conditions of supply for your
country.
The installation, electrical connection
and first operation of this appliance
should be carried out by a qualified
installer.
The company does not accept liability for
failure of any goods supplied which accor-
dance with the manufacturer's instructions.
c) Element scaled up.
3. Fault finding
- user
Not hot water.
The heating element in the DHF ... C
compact control does not switch on despite
a fully opened hot water fitting.
– No power supply. – Check fuses in the domestic system.
– The necessary switch-on quantity has not
been reached. Dirt accumulation or lime
scale blockage of the Perlators in the
fittings or the shower heads.
Fault Cause Remedy
Table 4
– Clean and/or descale.
Heating system does not heat water. – No voltage.
– Heating system faulty.
– Check fuse (house installation).
– Replace tubular heating element heating
system (11).
Table 5
– De-scale or replace element.