INSTALLATION
Service information
36 | DHB-E LCD www.stiebel-eltron.com
14. Service information
Overview of connections
D0000076842
1
2
3
4
5
6
7
1 Flow limiter
2 Flow sensor
3 High limit safety cut-out, automatic reset
4 NTC sensor
5 Pin strips for connected load and anti-scalding protection
6 Programming unit plug-in position
7 Diagnostic traffic light
Appliance cover retainer
D0000056216
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 restric-
tion reached
Green Flashing: Appliance connected to power supply
Diagnostic traffic
light
Fault Cause Remedy
No LED illuminates. The appliance does not heat
up.
There is no power supply. Check the fuse/MCB in your fuse box/distribution
board.
The PCB is faulty. Replace the test assembly.
Green flashes, yellow
off, red off
No DHW
The shower head/ aerator are scaled up. Descale or replace the shower head/ aerator if nec-
essary.
The strainer in the cold water inlet is dirty. Clean the strainer.
The flow meter is not plugged in. Reconnect the connecting cable on the PCB.
The flow meter is faulty. Replace the flow meter.
The PCB is faulty. Replace the test assembly.
Green flashes, yellow
on, red off
The display is completely off.
Loose set value transducer cable between PCB and
display.
Check the set value transducer cable and plug the
cable into the programming unit and/or PCB.
The programming unit connecting cable is faulty. Check the connecting cable and replace if required.
The programming unit PCB is faulty. Check the programming unit and replace if required.
Green flashes, yellow
on, red off
No DHW, the outlet temper-
ature does not match the set
value.
The downstream tap is faulty.
Replace the faulty tap.
Internal anti-scalding protection is activated. Deactivate the internal anti-scalding protection.
The heating system is faulty. Replace the test assembly.
The outlet detector is faulty. Replace the outlet sensor.
The PCB is faulty. Replace the test assembly.
Appliance is operating at its output limit. Reduce the flow rate. Install the flow limiter.
Green flashes, yellow
off, red on
No DHW, the outlet temper-
ature does not match the set
value.
The high limit safety cut-out is not enabled.
Activate the safety switch.
The high limit safety cut-out is not connected. Reconnect the connecting cable on the PCB.
The high limit safety cut-out has tripped. Remedy the cause and activate the safety switch.
The high limit safety cut-out is faulty. Replace the high limit safety cut-out.
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