iNSTAllATiON
Troubleshooting
18
| DHE AU
www.stiebel-eltron.com
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.
Signals of the diagnostic traffic lights (lED)
Red
Lights up 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 power supply phases are missing
Check the fuses in the distribution board
PCB faulty
Replace 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
Clean strainer
Flow meter not plugged in
Check plug-in connection; correct if necessary
Flow meter faulty or dirty
Replace flow meter
PCB faulty
Replace 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
Replace programming unit
PCB faulty
Replace the function module
Green flashing, yellow
on, red off
No DHW; outlet temperature
does not match set value
Tap faulty
Replace tap
Outlet sensor faulty
Replace outlet sensor
Heating system faulty
Replace the function module
PCB faulty
Replace the function module
Green flashes, yellow
flashes, red off
No DHW; outlet temperature
does not match set value
Motorised valve faulty
Replace motorised valve
Green flashing, yellow
off, red on
No DHW
One or more power supply phases are missing
Check the fuses in the 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 "i" 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 (fault code
display E1 and spanner)
No DHW
Safety switch not activated during
"Commissioning"
Activate the safety switch by firmly
pressing the reset button
Safety switch was 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; ac-
tivate safety switch and draw-off with
maximum set value >1 min
Safety switch responds again; PCB
faulty
Replace the function module
Green flashing, yellow
off, red on
Spanner flashes (fault code
display E2 and spanner)
No DHW
PCB faulty (lead break or short circuit
in inlet sensor)
Replace the function module
Green flashing, yellow
off, red on
Spanner flashes (fault code
display E3 and spanner)
No DHW
Short circuit in outlet sensor
Check outlet sensor; replace if neces-
sary
