Troubleshooting; Maintenance; Draining The Appliance; Cleaning The Strainer - Stiebel Eltron DCE-S 6/8 Plus Utilisation Et Installation

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Troubleshooting

14. 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.
Diagnostic traffic fault
lights (draw-off mode)
No LED illuminates Appliance does not heat up
Green flashing, yellow off, No DHW
red off
Green flashing, yellow on, No DHW; outlet temperature
red off does not match set value
Green flashing, yellow off, No DHW; outlet temperature
red on does not match set value

15. Maintenance

WARNING Electrocution
Before performing any work on the appliance, discon-
nect all poles from the power supply.
This appliance contains capacitors which are discharged
when disconnected from the power supply. The capacitor
discharge voltage may briefly exceed 60 V DC.

15.1 Draining the appliance

The appliance can be drained for maintenance work.
WARNING Burns
Hot water may escape when you drain the appliance.
f Close the shut-off valve in the cold water inlet line.
f Open all draw-off valves.
f Undo the water connections on the appliance.
f Store the dismantled appliance free from the risk of frost, as
water residues remaining inside the appliance can freeze and
cause damage.
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Signals of the diagnostic traffic lights (lED)
Red
Yellow
Green
Cause
One or more power supply phases are missing
PCB faulty
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 plugged in
Flow meter faulty or dirty
PCB faulty
Tap faulty
Programming unit connected to the PCB after
switching on the power supply
Outlet sensor faulty
Heating system faulty
PCB faulty
Air detection has responded
Safety switch not activated during "Commission-
ing"
Safety switch was 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
Short circuit in outlet sensor
PCB faulty

15.2 Cleaning the strainer

WARNING Burns
Hot water may escape when you drain the appliance.
Material losses
!
To ensure that the bare wire heating system is not dam-
aged following an interruption to the water supply, the
appliance must be recommissioned by taking the follow-
ing steps.
f Disconnect the appliance from the power supply by
f Vent the appliance and the cold water inlet line (see
f Switch on the power supply again.
The strainer in the cold water threaded fitting must be cleaned
regularly.
Lights up in the event of a fault
Lights up in heating mode/flashes when output limit
reached
Flashing: Appliance connected to power supply
remedy
Check the fuses in the distribution board
Replace the function module
Descale/replace the shower head/aerator
Cleaning the strainer
Check plug-in connection; correct if necessary
Replace flow meter
Replace the function module
Replace tap
Switch the fuses in the distribution board off and
back on again
Replace outlet sensor
Replace the function module
Replace the function module
Continue draw-off for > 1 min
Activate the safety switch by firmly pressing the
reset button
Check high limit safety cut-out (plug-in connec-
tion, connecting cable); activate safety switch
Replace high limit safety cut-out; activate safety
switch and draw-off with maximum set value
> 1 min
Replace the function module
Check outlet sensor; replace if necessary
Replace the function module
removing the fuses/tripping the MCBs.
chapter "Commissioning / Initial start-up").
DCE-S Plus | 13