INSTALLATION
Troubleshooting
17
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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 restric-
tion 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 pro-
gramming unit
Check plug-in connections; correct if necessary
Faulty connecting cable between PCB and pro-
gramming 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 flash-
ing, red off
No DHW; outlet temperature
does not match set value
Appliance is operating at its output limit Reduce flow rate; install flow limiter
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
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; activate safety
switch and draw off water at the maximum set
value for >1 min
Safety switch responds again; PCB faulty Replacing the function module
Short circuit in outlet sensor Check outlet sensor; replace if necessary
Faulty PCB Replacing the function module
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