OPERATION
Cleaning, care and maintenance
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While the wrench is showing, press and hold the Information
button for five seconds to advance the display to the error display
page.
Consult section 15, “Troubleshooting”, pg. 19 for information
on how to interpret the reported error code.
4.4 Recommended settings
Your electric tankless water heater offers maximum convenience
and accuracy when providing DHW. Should you need to operate
the water heater with a thermostatic valve, we recommend that
you:
f Adjust the set temperature on the water heater to over 122 °F
(50 °C). Then set the required set temperature on the thermo-
static valve.
Saving energy
The following recommended settings will result in the lowest en-
ergy consumption:
- 100 °F (38 °C) for hand washbasins, showers, baths
- 131 °F (55 °C) for kitchen sinks
Internal anti-scalding protection (qualified contractors)
If required, the qualified contractor can set a permanent tempera-
ture limit, for example in nurseries, hospitals,etc.
When supplying a shower, the water heater temperature setting
range must be adjusted by the qualified contractor to 131 °F (55 °C)
or less.
For full information, see section 11.1, “Internal anti-scalding pro-
tection via jumper slot”, pg. 15.
Recommended setting for operation with a thermostatic valve
and water preheated by solar energy
f Set the temperature at the water heater to the maximum
temperature.
Following an interruption to the water supply
!
Material losses
To ensure that the Direct Coil
™
heating system is not dam-
aged following an interruption to the water supply, the
water heater must be restarted by taking the following
steps.
f Shut off power to the unit at the breaker panel by
making sure that connected circuit breakers are
“OFF” to avoid any danger of electric shock.
f Open and close the tap at least five times for three
minutes total, until the water heater and its up-
stream cold water inlet line are free of air.
f Switch the power back ON at the breaker.
5. Cleaning, care and maintenance
f Never use abrasive or corrosive cleaning agents. A damp
cloth is sufficient for cleaning the water heater.
f Check the taps regularly. Limescale deposits at the tap out-
lets can be removed using commercially available descaling
agents.
6. Troubleshooting
Problem Cause Solution
The water heater will not
start despite the DHW
valve being fully open
There is no power
Check to ensure circuit
breaker in breaker panel
hasn’t tripped. Reset if
necessary
The white AE3 safety
switch has not been en-
gaged during initial start-
up. Activate if necessary
(See section 11.3.1, “Initial
AE3 safety switch activa-
tion”, pg. 15). If the AE3
switch has tripped after
initial installation, contact
a qualified contractor to
fix the cause
The aerator in the tap
or the shower head is
scaled up or dirty
Clean and/or descale the
aerator or shower head
The water supply has
been interrupted
Vent the water heater and
the cold water inlet line
When hot water is being
drawn off, cold water
flows for a short period
The air detector de-
tects air in the water. It
switches off the heat-
ing output briefly
The water heater restarts
automatically after 1min-
ute
The required temperature
cannot be set
Internal anti-scalding
protection is activated
The internal anti-scalding
protection can only be
adjusted by qualified con-
tractors
Note
The information shown on the programming unit and the
selected settings are retained following a power failure
(with the exception of the time).
If you cannot remedy the problem, contact your qualified con-
tractor. To facilitate and speed up your inquiry, please provide the
serial number from the type plate (000000-0000-000000).
Nr.: 000000-0000-00000
D0000073621
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