Maintenance; Draining The Appliance; Cleaning The Strainer - AEG DDLE LCD 18 Utilisation Et Installation

Fault / diagnostic traffic light LED
display
Inadequate flow rate.
The set temperature is not achieved.
The heater does not switch on.
No hot water and no traffic light display. The MCB/fuse has responded/blown.
Traffic light display: Green flashing or
constantly ON
No hot water at a flow rate of
> 2.5 l/min.
Traffic light display: Steady yellow light,
flashing green light
No hot water at flow rate
> 2.5 l/min.
Traffic light display: Yellow constantly
on; green flashing
Traffic light display: Red constantly on;
green flashing
No hot water
Accurate temperature delivery > 45 °C
is not reached.
Traffic light display: Red constantly on;
green flashing

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.
Cause
The strainer in the appliance is dirty.
One phase down.
Air is detected in the water and heating output is
briefly switched off.
The safety pressure limiter has tripped.
The PCB is faulty.
The PCB is faulty.
The flow meter DFE is not plugged in.
The flow meter plug is faulty.
The high limit safety cut-out has responded or its
lead is broken.
The heating system is faulty.
The PCB is faulty.
The outlet sensor is unplugged or the lead is bro-
ken.
The cold water sensor is faulty.
The cold water inlet temperature exceeds 45 °C.
The outlet sensor is faulty (short circuit).
Installation - for qualified contractors
Remedy
Clean the strainer.
Check the fuses/MCBs in your fuse box/distribution
panel.
The appliance restarts after one minute.
Check the fuses/MCBs in your fuse box/distribution
panel.
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").
Check the PCB and replace if required.
Check the PCB and replace if required.
Plug the flow meter plug back in.
Check the flow meter and replace it if required.
Check the high limit safety cut-out and replace it if
required.
Check the heating system resistor, and replace it if
required.
Check the PCB and replace if required.
Plug in the outlet sensor or replace it if required.
Check the PCB and replace if required.
Reduce the cold water inlet temperature to the ap-
pliance.
Check the outlet sensor and replace it if required.

Cleaning the strainer

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.
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