STIEBEL ELTRON WWK 302 H - Rapid Heat-Up Button

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4.5 "Rapid heat-up" button
Note
In appliances with no electric emergency/booster heater,
this button only allows you to clear the high pressure/low
pressure lockout. You cannot start rapid/comfort heat-up
or emergency heating mode.
Note
To start rapid/comfort heat-up with the "Rapid heat-up"
button, the start screen must be displayed.
Press the "Rapid heat-up" button for two
seconds.
The heat pump and electric emergency/
booster heater symbols appear.
4.5.1 Rapid/comfort heat-up
Normally, the "Rapid heat-up" button is used to activate the rapid/
comfort heat-up function, which enables you to cover an unex-
pectedly high DHW demand without changing any of the appli-
ance's standard settings.
If rapid/comfort heat-up is activated manually by pressing the rel-
evant button, the heat pump and the electric emergency/booster
heater will start once in parallel, irrespective of the selected set
temperature, and will remain active until the DHW temperature
in the cylinder has reached 65°C. To save energy, the electric
emergency/booster heater switches off sooner, once a temper-
ature of 65°C has been achieved in the upper cylinder section
(rapid heat-up).
The rapid/comfort heat-up function remains active until a tem-
perature of 65°C has been achieved in the entire DHW cylinder
(comfort heat-up). The appliance then automatically switches back
to the previously set parameters.
Note
The electric emergency/booster heater and heat pump
symbols are displayed until the rapid/comfort heat-up
function has terminated.
Note
To end rapid/comfort heat-up, press the "Rapid heat-up"
button for two seconds.
4.5.2 Emergency mode
If the appliance is faulty, you can use emergency mode to activate
the electric emergency/booster heater.
Following a DHW demand, the appliance measures the temper-
ature rise every 15minutes. If the temperature rise was <0.25°C
within the 15minute period, this is recorded by a counter. If the
temperature rise did not reach >0.25°C in any 15minute period
over 13hours, the compressor shuts down. The fault key flashes
on the display and a fault code indicates that the appliance is not
heating the water.
Press the "Rapid heat-up" button for two
seconds.
The "Electrical emergency/booster heat-
er" symbol appears. The "Service/fault"
symbol flashes.
After the "Rapid heat-up" button has been pressed, the indicated
fault code increments by a value of 256, as the fault codes are
added together (see fault code table in chapter "Troubleshooting").
The fault key continues to flash. The electric emergency/booster
heater is activated.
The current set temperature (set temperature1 or set tempera-
ture2) is ignored.
In emergency heating mode, the appliance operates with a fixed
set temperature. In the upper cylinder section, the DHW is heated
up to 65°C by the electric emergency/booster heater.
Following one-off enabling of this function by means of the "Rapid
heat-up" button, this function remains enabled for 7days.
Following 7days of emergency operation the electric emergency/
booster heater is disabled. The fault code shown on the display
decreases by256.
If you press the "Rapid heat-up" button again for two seconds
within the 7days of emergency heating mode, the 7-day runtime
for emergency heating mode will restart.
If the 7-day runtime for emergency heating mode has expired,
you can restart emergency heating mode for a further 7days by
pressing "Rapid heat-up".
Pressing the "Rapid heat-up" button only enables emergency
mode if a fault with fault code8 occurred previously. In standard
mode, pressing the "Rapid heat-up" button only triggers one-off
heat-up of the DHW cylinder.
Emergency mode is no longer active after an interruption to the
power supply. The appliance tries again to heat with the heat
pump.
You can avoid having to wait until the temperature increase time
has elapsed (see chapter "Specification") by starting manual emer-
gency heating mode.
Manual emergency heating mode
If a fault has occurred and no fault code is displayed, you can
activate emergency heating mode.
Keep the "Plus" and "Minus" buttons
pressed. In addition, press the "Menu"
button and keep all three buttons pressed
for 5seconds.
The "Electrical emergency/booster heat-
er" symbol appears. The "Service/fault"
symbol flashes.