STIEBEL ELTRON PEO 18/21/24 - Appliance shutdown; Troubleshooting

INSTALLATION
Appliance shutdown
ENGLISH
www.stiebel-eltron.com PEO 18/21/24 | PEO 27 | 13
Appliance handover
 Explain the appliance function to users and familiarise them
with how it works.
 Make the user aware of potential dangers, especially the risk
of scalding.
 Hand over these instructions.
11.2 Recommissioning
Vent the appliance and the cold water inlet line (see chapter "Set-
tings").
See chapter "Initial start-up".
12. Appliance shutdown
 Isolate all poles of the appliance from the power supply.
 Drain the appliance (see chapter "Maintenance").
13. Troubleshooting
WARNING Electrocution
To test the appliance, it must be supplied with power.
Indicator options for diagnostic traffic light (LED)
Red Illuminates in the event of a fault
Yellow Illuminates during heating operation
Green Flashing: Appliance connected to power supply
1
D0000041794
1 Diagnostic traffic light
13.1 Operation with preheated water
You can restrict the maximum inlet temperature by installing a
central thermostatic valve.
Fault / LED diagnos-
tic traffic light
Cause Remedy
The flow rate is too low. The strainer in the appli-
ance is dirty.
Clean the strainer.
The set temperature is
not achieved.
One phase down. Check the fuse/MCB in
your fuse box/distribu-
tion board.
The heating system does
not switch on.
Air has been detected in
the water and heating
output is briefly switched
off.
The appliance restarts
after one minute.
No hot water and no traf-
fic light display.
The MCB/fuse has re-
sponded/blown.
Check the fuse/MCB in
your fuse box/distribu-
tion board.
Safety pressure limiter
AP 3 has tripped.
Remove the cause of the
fault (e.g. faulty pressure
flush).
Protect the heating sys-
tem against overheating
by opening a draw-off
valve downstream of the
appliance for one minute.
This depressurises and
cools down the heating
system.
Activate the safety
pressure limiter at flow
pressure by pressing the
reset button (see chapter
"Commissioning").
The PCB is faulty. Check the PCB and re-
place if required.
Traffic light display:
Green flashing or con-
stantly on
The PCB is faulty. Check the PCB and re-
place if required.
No hot water at a flow
rate >2.5l/min.
The flow meter (DFE) is
not plugged in.
Plug the flow meter plug
back in.
The flow meter (DFE) is
faulty.
Check the flow meter and
replace if required.
Traffic light display: Yel-
low constantly on; green
flashing
The high limit safety
cut-out has responded or
suffered a lead break.
Check the high limit safe-
ty cut-out and replace it
if required.
No hot water at flow rate
of >3l/min.
The heating system is
faulty.
Check the heating system
resistor and replace if
required.
The PCB is faulty. Check the PCB and re-
place if required.
Traffic light display: Yel-
low constantly on; green
flashing
The outlet sensor is
unplugged or the lead is
broken.
Plug in the outlet sensor
or replace if required.
Traffic light display: Red
constantly on; green
flashing
The cold water sensor is
faulty.
Check the PCB and re-
place if required.
No hot water
Required temperature >
45°C is not achieved.
The cold water inlet tem-
perature exceeds 45°C.
Reduce the cold water
inlet temperature to the
appliance.
Traffic light display: Red
constantly on; green
flashing
The outlet sensor is
faulty (short circuit).
Check the outlet sensor
and replace if required.