27
Installation - for qualified contractors
Fault / diagnostic traffic light LED
display
Cause
Remedy
Inadequate flow rate.
The strainer in the appliance is dirty.
Clean the strainer.
The set temperature is not achieved.
One phase down.
Check the fuses/MCBs in your fuse box/distribution
panel.
The heater does not switch on.
Air is detected in the water and heating output is
briefly switched off.
The appliance restarts after one minute.
No hot water and no traffic light display. The MCB/fuse has responded/blown.
Check the fuses/MCBs 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.
Enable the safety pressure limiter at flow pressure
by pressing the reset button (see chapter “Commis-
sioning”).
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
> 2.5 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 it if required.
Traffic light display: Steady yellow light,
flashing green light
No hot water at flow rate
> 2.5 l/min.
The high limit safety cut-out has responded or its
lead is broken.
Check the high limit safety cut-out and replace it if
required.
The heating system is faulty.
Check the heating system resistor, and replace it if
required.
The PCB is faulty.
Check the PCB and replace if required.
Traffic light display: Yellow constantly
on; green flashing
The outlet sensor is unplugged or the lead is bro-
ken.
Plug in the outlet sensor or replace it 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
Accurate temperature delivery > 45 °C
is not reached.
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 it if required.
14.
Maintenance
WARNING Electrocution
Before any work on the appliance, disconnect all
poles from the power supply.
Draining the appliance
You can drain the appliance for maintenance work or to
protect it from frost.
WARNING Burns
Hot water may escape when draining the appliance.
» Close the shut-off valve in the twin connector or the
cold water inlet line.
» Open all draw-off valves.
» Undo the water connections on the appliance.
» Store the dismantled appliance in a room free from
the risk of frost, as water residues remaining inside
the appliance can freeze and cause damage.
Cleaning the strainer
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2_0
2_0
94
9
If dirty, clean the strainer in the cold water threaded fitting.
Close the shut-off valve in the cold water inlet line before
removing, cleaning and refitting the strainer.
Summary of Contents for 222392
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