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INSTALLATION
Appliance shutdown
12. Appliance shutdown
f Isolate all poles of the appliance from the power supply.
f Drain the appliance (see chapter "Installation / Maintenance /
Draining the appliance").
13. Troubleshooting
WARNING Electrocution
To test the appliance, it must be supplied with power.
Indicator options for diagnostic traffic light (LED)
Red
Yellow
Green
13.1 Fault table
Fault / LED diagnostic traffic light signal Cause
The appliance does not start.
The flow rate is too low.
The temperature is not achieved.
The heating system does not switch on.
No hot water and no traffic light display.
No hot water at flow rate of > 2.3 l/min.
Traffic light display: green flashing.
No hot water at flow rate of > 2.3 l/min.
Traffic light display: yellow constantly on; green
flashing.
No hot water.
Traffic light display: red constantly on; green flashing.
26
| HDB-E Si
Illuminates in the event of a fault
Illuminates during heating operation
Flashing: Appliance connected to
power supply
The shower head/aerators are scaled up.
The strainer 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 "Installation /
Specification / 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 "Installation / Specification / wiring diagram"
or has suffered 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.
Remedy
Descale or if necessary replace the shower head /
aerators.
Clean the strainer.
Check the fuse/MCB in your fuse box/distribution
board.
The appliance restarts after one minute.
Check the fuse/MCB in your fuse box/distribution
board.
Remove the cause of the fault (e.g. faulty pressure
washer).
Protect the heating system against overheating by
opening a draw-off valve downstream of the appli-
ance for one minute. This depressurises and cools
down the heating system. Activate the safety pressure
limiter at flow pressure by pressing the reset button,
also see chapter "Installation / Commissioning / Ini-
tial start-up".
Check the PCB and replace if required.
Check the PCB and replace if required.
Re-insert the flow sensor plug.
Check the flow meter/flow sensor and replace if re-
quired.
Check the high limit safety cut-out and replace it if
required.
Check the resistance of the heating system, and re-
place if required.
Check the PCB and replace if required.
Reduce the cold water inlet temperature to the ap-
pliance.
Check the PCB and replace if required.
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