INsTALLATIoN
Troubleshooting
40
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15. Troubleshooting
WARNING Electrocution
To test the appliance, it must be connected to the power
supply.
Note
When testing the appliance using the diagnostic traffic
lights, water must be flowing.
Indicator options for diagnostic traffic light (LED)
Red
Illuminates in the event of a fault
Yellow Illuminates in heating mode/flashes when output limit
reached
Green
Flashing: Appliance connected to power supply
Diagnostic traffic
lights (draw-off
mode)
fault
Cause
remedy
No LED illuminates
Appliance does not heat up One or more mains power phases missing
Check fuses/MCBs in distribution board
Faulty PCB
Replacing the function module
Green flashing, yellow
off, red off
No DHW
Appliance starting flow rate not reached; shower
head/aerator scaled up
Descale/replace the shower head/aerator
Appliance starting flow rate not reached; strainer in
cold water inlet dirty
Cleaning the strainer
Flow meter not attached
Check plug-in connection; correct if necessary
Flow meter faulty or dirty
Replacing the flow meter
Faulty PCB
Replacing the function module
Green flashing, yellow
on, red off
No display
Loose connecting cable between PCB and program-
ming unit
Check plug-in connections; correct if necessary
Faulty connecting cable between PCB and program-
ming unit
Check connecting cable; replace if necessary
Programming unit faulty
Replacing the programming unit
Faulty PCB
Replacing the function module
Green flashing, yellow
on, red off
No DHW; outlet temperature
does not match set value
Tap faulty
Replace tap
Faulty outlet sensor
Replace the outlet sensor
Heating system faulty
Replacing the function module
Faulty PCB
Replacing the function module
Green flashing, yellow
flashing, red off
No DHW; outlet temperature
does not match set value
Appliance is operating at its output limit
Reduce flow rate; select one of the ECO levels
Appliance is operating at its output limit
Check jumper position for connected load
Heating system faulty
Replacing the function module
Green flashing, yellow
off, red on
No DHW; outlet temperature
does not match set value
One or more mains power phases missing
Check fuses/MCBs in distribution board
Air detection has responded
Continue draw-off for >1 min
15.1 Fault code display
If there is an appliance fault, the spanner flashes on the display.
f
f
To call up the fault code display, press the ECO button for
more than 5 seconds.
Diagnostic traffic
lights (draw-off
mode)
Display shown
fault
Cause
remedy
Green flashing, yellow
off, red on
Spanner flashes (display E1
and spanner in menu "Fault
code display")
No DHW; outlet temperature
does not match set value
Safety switch not activated during
"Commissioning"
Activate safety switch by pressing the
reset button firmly
Safety switch triggered by high limit
safety cut-out
Check high limit safety cut-out (plug-in
connection, connecting cable); activate
safety switch
Safety switch responds again after high
limit safety cut-out has been checked;
high limit safety cut-out faulty
Replace high limit safety cut-out; acti-
vate safety switch and draw off water
at the maximum set value for >1 min
Safety switch responds again; PCB
faulty
Replacing the function module
Green flashing, yellow
off, red on
Spanner flashes (display E2
and spanner in menu "Fault
code display")
No DHW
PCB faulty (lead break or short circuit
in inlet sensor)
Replacing the function module
Green flashing, yellow
off, red on
Spanner flashes (display E3
and spanner in menu "Fault
code display")
No DHW
Short circuit in outlet sensor
Check outlet sensor; replace if neces-
sary