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34 | DHB-E SLi www.stiebel-eltron.com
INSTALLATION
Troubleshooting
14. Troubleshooting
WARNING Electrocution
To test the appliance, it must be supplied with power.
Indication variants for diagnostic traffic light (LED)
Red Illuminates in the event of a fault
Yellow Illuminates during heating operation
Green Flashing: Appliance is supplied with mains power
Fault / LED diagnostic traffic light signal Cause Remedy
The appliance does not start. The shower head / aerators are scaled up. Descale or if necessary replace the shower head/
aerators.
The flow rate is too low. The strainer in the appliance is dirty. Clean the strainer.
The set temperature is not achieved. One phase down. Check the fuse/MCB in your fuse box/distribution
panel.
The heater switches off. The air detector senses air in the water. Heating output
cuts out temporarily.
The appliance restarts after one minute.
No hot water and no traffic light display. The MCB/fuse has responded/blown. Check the fuse/MCB in your fuse box/distribution
panel.
The safety pressure limiter has tripped.
Remove the cause of the fault (e.g. faulty pressure
flush).
Protect the heating system against overheating by
opening a draw-off valve downstream from the ap-
pliance for one minute. This depressurises and cools
down the heating system.
Activate the safety pressure limiter at flow pressure
by pressing the reset button, also see chapter "In-
stallation/ Commissioning/ Initial start-up".
The PCB is faulty. Check the PCB and replace if necessary.
Traffic light display: Green flashing
No hot water at flow rate
>3l/min.
Flow sensor DFE is not plugged in.
Re-insert the flow sensor plug.
Flow sensor DFE is faulty. Check the flow sensor and replace if necessary.
The set temperature is not achieved.
The set value transducer or connecting cable is faulty, or
the connecting cable is not attached.
Attach the connecting cable; replace the set value
transducer if required.
Temperature limiting is enabled. Disable temperature limiting.
Traffic light display: Yellow constantly on; green
flashing
No hot water at flow rate
>3l/min.
The high limit safety cut-out has responded or suffered
a lead break.
Check the high limit safety cut-out and replace if
necessary.
The heating system is faulty. Check the resistance of the heater and replace if
necessary.
The PCB is faulty. Check the PCB and replace if necessary.
Traffic light display: Yellow constantly on; green
flashing
The outlet sensor is faulty. Check the connection and replace the outlet sensor
if necessary.
Set temperature is not achieved. Appliance is operating at its output limit. Reduce the flow rate. Install the flow limiter.
Traffic light display: Red constantly on; green
flashing
The outlet sensor is faulty. Check the connection and replace the outlet sensor
if necessary.
No hot water The cold water sensor is faulty. Check the PCB and replace if necessary.
Required temperature >45°C not reached. The cold water inlet temperature exceeds 45°C. Reduce the cold water inlet temperature to the ap-
pliance.
34


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