Operating Instructions and Installation Instructions

40
Installation - for contractors
12. 
» Isolate the appliance from the power supply by
means of the fuse/MCB in your fuse box or by pulling
the power cable plug from the socket.
» Drain the appliance (see chapter "Maintenance").
13. Troubleshooting
Problem  
The appliance will not
start despite the DHW
valve being fully open.
The aerator in the tap
is scaled up or dirty.
Clean and/or descale
the aerator or replace
the special aerator.
The flow rate is set
too low.
Increase the flow rate.
The sieve in the cold
water line is blocked.
Clean the sieve after
shutting off the cold
water inlet line.
The heater is faulty. Check the resistance
of the heating system
and replace the appli-
ance if required.
The safety pressure
limiter has responded.
Remedy the cause of
the fault. Isolate the
appliance from the
power supply and de-
pressurise the water
line. Activate the safe-
ty pressure limiter.
The required tem-
perature is not being
reached.
The appliance is at its
output limit.
Reduce the flow rate.

26_02_05_0082_
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1 Illuminates red in the case of a fault
2 Illuminates yellow during heating operation
3 Flashes green if the PCB is receiving power