Specifications

DEX 18 / 21 / 24 / 27 KW
24
Your instantaneous water heater DEX was manufactured conscientiously and checked
several times before delivery. Should malfunctions nevertheless occur, it is usually only
due to a bagatelle. First attempt to switch the house fuses off and on again in order to
reset the electronics. Next, try to remedy the problem with reference to the following
table. In doing so, you will avoid unnecessary expense of customer service assistance.
Repairs must only be carried out by
authorised professionals.
If a fault in your appliance cannot be
rectified with the aid of this table,
please contact a nearby Austria Email
service point (see reverse for list of
addresses). Please have the details of
the typeplate at hand.
14. Trouble-shooting and service
Austria Email AG
Central Customer Service
Tel. [phone]
E-Mail: [e-mail]
Problem Cause Solution
Water stays cold, digital dis-
play does not light up
Master fuse trip-
ped
Renew or activate fuse
STDB tripped
Reset STDB by contact custo-
mer service
Display flashes error message
“Er“
Control system
has switched off
Switch fuse off and on. If
“Er“still flashes contact custo-
mer service
Display flashes error message
“Er PH“ or “188”
Power supply
Check electrial connection by
technician. 3~ 400 V/PE availa-
ble?
Flow rate of hot water too
weak
Outlet fitting dirty
or calcified
Clean shower head, jet regula-
tor or sieves
Fine filter dirty or
calcified
Let clean fine filter by customer
service
Selected temperature is not
reached , decimal point lights
up
Water flow rate
too high
Reduce water flow rate at the
tap
Selected temp. is not reached ,
decimal point does not light
Cold water has
been added via
the tap
Tap hot water only; set tempe-
rature for use
Decimal point flashes
Inlet temperature
exceeding nomi-
nal temperature
Reduce inlet temperature
No response upon keypress
Hood is not fitted
properly
Refit the hood properly