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
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