AEG DDLE LCD 27 - Troubleshooting by Contractor

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
30).
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
High limit safety cut-out triggered or
cable break
Heating system faulty
Faulty electronics
Check high limit safety cut-out and
replace, if required.
Test the heating system resistor (
A
17)
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 > 45 °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 sensor pulled or lead broken Push on outlet sensor 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