AEG DDLE Basis 18 / 21 / 24 / 27 - Инструкция по эксплуатации - Страница 32

32

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 the cause for the 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; throughput> 3 l/min
Traffic light display: 

green flashing or constantly ON

Faulty electronics

Flow sensor DFE not plugged int

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.

6. 

Troubleshooting

 by the user

For users and contractors

7. 

Troubleshooting

 by the contractor

Fault

Cause

Remedy

The heating system inside the 
instantaneous water heater will not 
start in spite of the tap being fully open.

No voltage.

User / Contractor:
Check the fuses in your fuse board.

The start-up volume required to start the 
heater has not been reached.
Contamination or scaling of perlators in 
water taps or shower heads.

User / Contractor:
Clean and / or descale.

Heating system faulty.

Call service / contractor:
Test heater and replace, if required.

Intermittent cold water

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

Device starts again after one minute.

Table 5