Troubleshooting; Display Options For Led Diagnostic Traffic Light; Fault Table; Maintenance - STIEBEL ELTRON HDB-E 12 Si Bedienung Und Installation

INSTALLATION

Troubleshooting

13. Troubleshooting
WARNING Electrocution
In order to check the appliance. it must be supplied
with power.
13.1 Display options for LED diagnostic traffic light
Possible indications
Red
Yellow
Green

13.2 Fault table

Fault / diagnostic traffic light LED display Cause
The appliance does not start.
Inadequate flow rate.
The temperature is not achieved.
The heater does not switch on.
No hot water and no traffic light display.
No hot water at flow rate of > 23 l/min.
Traffic light display: green flashing.
No hot water at flow rate of > 23 l/min.
Traffic light display: yellow constantly on; green
flashing.
No hot water.
Traffic light display: red constantly on; green flash-
ing.

14. Maintenance

WARNING Electrocution
Before any work on the appliance. disconnect all poles
from the power supply.
Draining the appliance
You can drain the appliance for maintenance work or to protect
it from frost.
CAUTION Scalding
Hot water may escape when draining the appliance.
28 | HDB-E Si
Illuminates in case of faults
Illuminates in heating mode
Flashing: appliance is supplied with
mains power
The shower head / aerators are scaled up.
The sieve in the appliance is dirty.
One phase down.
The air sensor detects the presence of air in the
water and briefly switches the heater off.
The MCB/fuse has responded/blown.
The safety pressure limiter (see chapter "Specifica-
tion / Wiring diagram" has switched off.
The PCB is faulty.
The PCB is faulty.
The flow sensor is not plugged in.
The flow sensor is faulty.
The high limit safety cut-out has responded (see
chapter "Specification / wiring diagram" or has suf-
fered a break in continuity.
The heating system is faulty.
The PCB is faulty.
The cold water inlet temperature exceeds 35 °C.
The cold water sensor is faulty.
f Remedy
Descale or if necessary replace the shower head /
aerators.
Clean the strainer.
Check the MCB/fuse in your fuse box.
The appliance restarts after one minute.
Check the MCB/fuse in your fuse box.
Remove the cause of the fault (e.g. faulty pressure
washer).
Protect the heating system against overheating by
opening a draw-off valve downstream from the ap-
pliance for one minute. This depressurises and cools
down the heater. Activate the safety pressure limiter
at flow pressure by pressing the reset button; see
also chapter "Commissioning".
Check the PCB and replace if necessary.
Check the PCB and replace if necessary.
Plug the flow sensor plug back in.
Check the flow sensor and replace it if required.
Check the high limit safety cut-out and replace it if
required.
Check the resistance of the heating system. and re-
place the appliance if required.
Check the PCB and replace if necessary.
Reduce the cold water inlet temperature to the ap-
pliance.
Check the PCB and replace if necessary.
f Close the shut-off valve in the cold water supply line.
f Open all draw-off valves.
f Undo the water connections on the appliance.
f Store the dismantled appliance in a room free from the risk
of frost. as water residues remaining inside the appliance can
freeze and cause damage.
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