STIEBEL ELTRON DHE 27 - Page 30

30
English
Probelm Cause Solution
The DHE is supplied as standard with an
integrated diagnostic system to locate
faults quickly. The DHE’s control units have
therefore been given some new functions
in service mode.
The tripped safety switch can be
reset using the blue reset push-
button (item 15), but the unit must
have been installed.
Key to Fig. 26
1 Thermostat (with rotary knob and
push-button function) / In service
mode it is possible to switch between
the individual service displays by
pressing the thermostat (Table 5)
2 ECO push-button (automatically
restricts the maximum flow to 8 l/min)
3 Memory push-buttons
4 Service symbol (customer service
mode activated)
5 Power bar for currently connected
power between 0% and 100% of
maximum power / In service mode the
power bar is used as a service display
6 EIB symbol when connected to electric
domestic control system
7 ECO symbol when in ECO mode
8 Solar mode activated
9 Temperature restriction activated
10 Error message
11 Line display unit
12 Push-button for solar mode
13 Push-button for temperature
restriction
14 Push-button for customer service
mode
15 Safety switch reset push-button
Abb. 26 / Fig. 26 / Afb. 26
Tab. 4
Cold water for short periods
Insufficient flow
ERROR symbol continuously displayed on
control unit
ERROR symbol displayed on control unit
only when water is run
Heating does not come on / no hot water
– ECO mode is activated (8 l/min) symbol
7
– Malfunction in control unit/unit
communication
– Reset push-button of safety switch not
activated on start-up (Item 15)
– Inlet temperature above 60 °C
– No power
– Heating system faulty
– Air detection system senses air in the
water and switches heating power off
for short periods
– User: Press ECO push-button, symbol
disappears.
– Service engineer required:
– Service engineer required:
– User / qualified installer:
Limit inlet temperature to below 60 °C.
– Service engineer required:
Check fuse (domestic system).
– Service engineer required:
Measure resistance in heating system
and if necessary replace.
– Unit will return to normal operation in a
short while.
– Dirt
– Internal sensor error
– Error in safety monitoring system (safety
switch tripped or cannot be activated)
– Shower head/rose blocked with
limescale
– User:
Entkalken ggf. erneuern.
– Service engineer required:
Clean filter.
Troubleshooting by user and qualified installer
Fault recovery by qualified installer
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