22 |WPL 33 www.stiebel-eltron.com
INSTALLATION
Troubleshooting
16. Troubleshooting
Note
Please observe the heat pump manager operating and
installation instructions.
Note
The following inspection instructions may only be carried
out by a qualified contractor.
If you cannot locate the fault using the heat pump manager, use
the controls on the IWS.
Open the control panel.
Read the following sections on troubleshooting and carry out
the instructions.
16.1 Controls on the IWS
The IWS helps you to troubleshoot if the fault cannot be identified
using the WPM.
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1
2
1 LEDs
2 Reset button
Red LED (left)
Faults indicated by the LED:
- High pressure fault
- Low pressure fault
- Central fault
- Hardware fault on the IWS (see fault list, operating and in-
stallation instructions of the heat pump manager)
Fault Cause Remedy
The appliance stops and
restarts after the idle pe-
riod has expired. The red
LED flashes.
There is a heat pump
fault.
Check the fault message
on the WPM.
Find the solution in the
WPM instructions (fault
list). Reset the IWS.
The appliance stops per-
manently. The red LED is
illuminated steadily.
Five faults have oc-
curred within two
hours of compressor
runtime.
Check the fault message
on the WPM. Find the
solution in the WPM in-
structions (fault list). Reset
the IWS.
Green LED (centre)
The LED flashes during initialisation, and illuminates constantly
after the BUS address has been assigned successfully. Connection
to the WPM has been established.
Green LED (right)
No function.
16.1.1 Reset button
If the IWS was not initialised successfully, you can reset it with this
reset button. Observe the "Reinitialising IWS" chapter in the heat
pump manager operating and installation instructions.
16.2 Resetting the high limit safety cut-out
If the heating water temperature exceeds 85°C, the electric emer-
gency/booster heater shuts down.
1
2
26_03_01_1900
1 High limit safety cut-out reset button
2 Electric emergency/booster heater
Remove the cause of the fault.
Reset the high limit safety cut-out by pressing the reset but-
ton. To do so, use a pointed object.
Check whether the heating water is being circulated at a suf-
ficiently high flow rate.
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