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iNSTallaTiON
Troubleshooting
14. Troubleshooting
WARNING Electrocution
To test the appliance, it must be supplied with power.
fault / lED diagnostic traffic light signal Cause
The appliance does not start.
The flow rate is too low.
The set temperature is not achieved.
The heater switches off.
No hot water and no traffic light display.
Traffic light display: Green flashing
No hot water at flow rate
> 3 l/min.
The set temperature is not achieved.
Traffic light display: Yellow constantly on; green
flashing
No hot water at flow rate
> 3 l/min.
Traffic light display: Yellow constantly on; green
flashing
Set temperature not reached.
Traffic light display: Red constantly on; green
flashing
No hot water
Required temperature > 35 °C is not reached
14
| DHB-E
indicator options for diagnostic traffic light (lED)
The shower head/aerators are scaled up.
The strainer in the appliance is dirty.
One phase down.
The air detector senses air in the water. Heating output
cuts out temporarily.
The MCB/fuse has responded/blown.
Safety pressure limiter AP 3 has tripped.
The PCB is faulty.
Flow sensor DFE is not plugged in.
Flow sensor DFE is faulty.
The set value transducer or connecting cable is faulty, or
the connecting cable is not attached.
The high limit safety cut-out has responded or suffered
a lead break.
The heating system is faulty.
The PCB is faulty.
Appliance is operating at its output limit.
The cold water sensor is faulty.
The cold water inlet temperature exceeds 45 °C.
Red
Illuminates in the event of a fault
Yellow
Illuminates during heating operation
Green
Flashing: Appliance connected to power supply
remedy
Descale or if necessary replace the shower head /
aerators.
Clean the strainer.
Check the fuse/MCB in your fuse box/distribution
board.
The appliance restarts after one minute.
Check the fuse/MCB in your fuse box/distribution
board.
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".
Check the PCB and replace if necessary.
Re-insert the flow sensor plug.
Check the flow sensor and replace if necessary.
Attach the connecting cable; replace the set value
transducer if required.
Check the high limit safety cut-out and replace if
necessary.
Check the resistance of the heater and replace if
necessary.
Check the PCB and replace if necessary.
Reduce the flow rate. Install the flow limiter.
Check the PCB and replace if necessary.
Reduce the cold water inlet temperature to the ap-
pliance.
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