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INSTALLATION
Troubleshooting
16 | DEL Plus 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.
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 To call up the fault code display, press the ECO button for
more than 5seconds.
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
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