Operating Instructions and Installation Instructions

26
Installation – for qualied contractors
12. Shutdown
» Isolate all poles of the appliance from the power
supply.
» Drain the appliance (see chapter "Installation /
Maintenance").
13. Troubleshooting
WARNING Electrocution
To test the appliance, it must be supplied with power.
Possible indications of diagnostic trafc light
(LED)
Red Illuminates in the event of a fault
Yellow Illuminates during heating mode
Green Flashing: Appliance is supplied with mains
power
1
D0000041794
1 Diagnostic trafc light
Fault / diagnostic traffic light LED
display
Cause Remedy
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 heating system does not switch on. The system detects air in the water. Heating output
stops 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
washer).
Protect the heating system against overheating by
opening a draw-off valve downstream of the appli-
ance for one minute. This depressurises and cools
down the heating system.
Activate the safety pressure limiter at flow pressure
by pressing the reset button (see chapter "Installa-
tion / Commissioning / Initial start-up").
The PCB is faulty. Check the PCB and replace if required.
Traffic light display: Green flashing or
constantly on
The PCB is faulty. Check the PCB and replace if required.
No hot water at a flow rate of
> 3 l/min.
The flow meter DFE is not plugged in. Plug the flow meter plug back in.
The flow meter plug is faulty. Check the flow meter and replace if required.
Traffic light display: Yellow constantly
on; green flashing
No hot water at a flow rate of
> 3 l/min.
The high limit safety cut-out has responded or its
lead is broken.
Check the high limit safety cut-out and replace if
required.
The heating system is faulty. Check the heating system resistor and replace if
required.
The PCB is faulty. Check the PCB and replace if required.
Traffic light display: Yellow constantly
on; green flashing
The outlet sensor has been pulled off. A lead is
broken.
Plug in the outlet sensor or replace if required.
Traffic light display: Red constantly on;
green flashing
The cold water sensor is faulty. Check the PCB and replace if required.
No hot water
Required temperature > 45 °C is not
achieved.
The cold water inlet temperature exceeds 45 °C. Reduce the cold water inlet temperature to the ap-
pliance.
Traffic light display: Red constantly on;
green flashing
The outlet sensor is faulty (short circuit). Check the outlet sensor and replace if required.