STIEBEL ELTRON DHB-E 11 LCD - 14 Service Information; 15 Troubleshooting

INSTALLATION
Service information
14. Service information
Overview of connections
1 Flow sensor
2 High limit safety cut-out, automatic reset
3 NTC sensor
4 Pin strips for connected load and anti-scalding protection
5 Programming unit plug-in position
6 Diagnostic traffic light
15. Troubleshooting
A
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.
Appliance cover retainer
Indicator options for diagnostic traffic light (LED)
l*ooi Red Illuminates in the event of a fault _
IQ*oi Yellow Illuminates In heating mode/flashes when output restric-
_ tion reached _
IQQ*1 Green Flashing: Appliance connected to power supply_
Diagnostic traffic
lights (draw-off mode)
Fault Cause Remedy
No LEO illuminates
Green flashing, yellow off,
red off
Green flashing, yellow on,
red off
Green flashing, yellow on,
red off
Green flashing, yellow flash¬
ing, red off
Appliance does not heat up
No DHW
No display
No DHW; outlet temperature
does not match set value
No DHW; outlet temperature
does not match set value
One or more mains power phases missing
Faulty PCB
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
loose connecting cable between PCB and pro¬
gramming unit
Faulty connecting cable between PCB and pro¬
gramming unit
Programming unit faulty
Faulty PCB
Tap faulty
Faulty outlet sensor
Heating system faulty
Faulty PCB
Appliance is operating at its output limit
Appliance is operating at its output limit
Heating system faulty
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; install flow limiter
Check jumper position for connected load
Replacing the function module
40 I DHB-E LCD www.stiebel-eltron.com