Troubleshooting - STIEBEL ELTRON DEL 18/21/24 Plus Bedienung Und Installation

INsTALLATIoN

Troubleshooting

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