11
A fault, what to do?
The reason for “service” to appear in the display is often very small. Please check whether you
can remove the fault yourself by using the following guidelines. You will save yourself the costs
of an unnecessary visit by customer service personnel.
If the fault could not be eliminated, please call customer service.
Fault
Cause
Solution
Who
Water flow-rate is too
low.
The filter in either the water tap
or the showerhead is clogged.
Remove the filter and either
clean it or descale it.
Customer
The filter in the corner regu-
lating valve is clogged.
Clean the filter.
Servicing expert
The water volume is
steadily reducing during
use.
Automatic regulation
See chapter “The meaning
of display indications –
Performance indicator”
Customer
The temperature can not
be set warmer than
42 °C.
The child protection feature
is activated.
To deactivate child pro-
tection, see “How to operate
the continuous-flow heater –
Setting a temperature limi-
tation/child protection”
Customer
The desired water tem-
perature is set, but it is
not reached.
The continuous-flow heater
is connected to a thermo-
statically-controlled water
faucet.
The temperature at the con-
tinuous-flow heater must be
set to 60 °C.
Customer
The display is blank.
The fuse in the house electrical
installation has triggered/blown.
Check the fuse in the house
electrical installation.
Customer
The appliance’s automatic cir-
cuit breaker has been triggered.
Check the appliance’s auto-
matic circuit breaker.
Servicing expert
The water is not warm.
The fuse in the house electrical
installation has triggered/blown.
Check the fuse in the house
electrical installation.
Customer
From time to time, cold
water flows out.
The air sensor in the appliance
detects air in the water and mo-
mentarily switches the heating
element off.
After a few seconds, the
continuous-flow heater auto-
matically goes back into
operation.
Continuous-flow
heater automati-
cally resolves
problem
The set temperature, for
instance 41, blinks. The
temperature of the water
leaving the tap is higher
than the set tempera-
ture.
The temperature of the water
supplying the continuous-flow
heater is higher than the set
temperature (e.g. due to pre-
warmed water supplied from
a solar water heater).
Mix in cold water at the water
faucet supply.
Customer
“service” lights up.
Deposits may have built up in
the appliance.
Open the warm water tap
fully to the warmest possible
setting and let the water flow
for one minute. Repeat as
necessary.
Customer
