AEG DDLE LCD 18 / 21 / 24 / 27 - Инструкция по эксплуатации - Страница 33

33

Display options LED diagnostic “traffic lights”

Red

illuminates in case of faults

Yellow

illuminates when the equipment is heating water

Green

flashing: the device is supplied with power

Fault / Diagnostic “traffic light” 
display*

Cause

Remedy

Flow rate too low

Shower head/perlators scaled up

Contamination

Descale and replace, if required.

Clean sieve ( 

H

 28).

Set temperature is not achieved

One phase down

Check fuse/MCB (fuse box).

Heater does not switch on / no hot 
water

The air sensor detects the presence of air 
in water and briefly switches the heater 
off.

Device starts again after one minute.

No hot water

Fuse/MCB blown/tripped

Check fuse/MCB (fuse box).

No “traffic light” display

Safety pressure limiter AP 3 has tripped

Faulty electronics

Remove cause of fault (e.g. faulty pressure 
washer).
Open downstream tap for 1 minute. 
This depressurises and cools down the 
heating system, protecting it against 
overheating.
Press the pushbutton on the safety 
pressure limiter (push 

A

 11).

Test the electronics PCB ( 

A

 7) and 

replace, if required.

No hot water; flow rate > 3 l/min
 
Traffic light display: 
green flashing or constantly ON

Faulty electronics

Flow sensor DFE not plugged in

Flow sensor DFE faulty

Test the electronics PCB ( 

A

 7) and 

replace, if required.

Refit the plug of the electronics PCB.

Check and replace the flow switch, 
if required.

No hot water; flow rate > 3 l/min 
 

Traffic light display: 
constant yellow illumination
green flashing

Safety pressure limiter AP 3 triggered or 
cable break

Heating system faulty
 

Faulty electronics

Check safety pressure limiter and replace, 
if required ( 

A

 11).

Test the heating system resistor ( 

A

 15) 

and replace, if required

 
Test the electronics PCB ( 

A

 7) and 

replace, if required.

No hot water

Traffic light display: 
constant red illumination 
green flashing

Cold water inlet temperature > 35 °C

Cold water sensor faulty

Reduce the temperature of the cold water 
supply to the device.

Test the electronics PCB ( 

A

7

) and 

replace, if required.

Inaccurate temperature control

No “traffic light” display

Outlet temperature sensor pulled or lead 
broken

Push on outlet temperature sencor lead, 
check and replace sensor/lead, if required.

No hot water

Traffic light display: 
constant red illumination

Outlet sensor faulty (short circuit)

Test outlet sensor and replace, if required.

Table 6

For contractors

7. 

Troubleshooting 

by the contractor