6. Troubleshooting by the user and the qualified installer
!
Danger of electrocution
To test the appliance, it must be sup-
plied with power.
6.1 Display options LED diagno-
stic „traffic lights“
Display options
red illuminates in case of faults
yellow illuminates when the appliance is
heating water
green flashing: The appliance is sup-
plied with power
6.2 Fault table
Fault Cause Display diagnosis
LED
Further diagno-
sis with service
monitor *
Elimination
No hot
water/ Outlet
temperature
not correct
No mains voltage
No LED on
User: Check fuse in the house installation
AE3 has tripped Qualified installer: Clarify cause. Rinse heating-system of unit, in
order to avoid over-heating. Switch AE3 on again
(check correct connection STB).
Electronic fault Qualified installer: Check electronics and if necessary replace
Failure of a phase
Green LED
flashing
Yellow LED off
User: Check fuse in the house installation
Unit at power limit Power bar 100 % User: Reduce flow
Qualified installer: If necessary install DMB
Inlet temperature
> 55 °C
Green LED flas-
hingRed LED on
Display C1 (inlet) Qualified installer: Limit inlet temperature
DFE faulty or not
plugged in
Green LED
flashing
Yellow LED of
Check flow Qualified installer: Check or replace DFE connection
Heating system
faulty
Green LED
flashing
Yellow LED on
Qualified installer: Check heating system and replace if necessary
Inlet sensor faulty
Green LED
flashing Red LED
permanently on
Error E1 (ELEC) Qualified installer: Replace electronics
Outlet sensor faulty Error E2 (NTC) Qualified installer: Check connection if necessary replace outlet sen-
sor
Error in the safety
electronics
Green LED flas-
hing Red LED on
in tap operation
Error E3 (AE3) Qualified installer: Attach AE3 connection cable and check AE3
Flow too
small
Showerhead/per-
lators scaled
(Check flow) User: Check fuse in the house installation
Fouling Qualified installer: Clean filter
LCD display
completely off
Loose connecting
cable to control
unit
Green LED
flashing
Qualified installer: Attach/check connecting cable
Control unit elec-
tronics faulty
Qualified installer: Check control unit if necessary replace
Set value
cannot be set
above 43 °C
Temperature cut-
out is activated
Green LED
flashing
Qualified installer: Deactivate temperature cut-out
Short term
cold water
No flow break in
< 2.5 l/min
Unit goes automatically back into operation if sufficient flow present
> 2.5 l/min
Air recognition
trips (cold water
for approx. 1 min)
Unit goes automatically back into operation with delay
* The service monitor offers further diagnosis option (see “7. Special fittings”).
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