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INSTALLATION
Maintenance
15.1.2 Checking the “BA” DIP switch on the IWS
Check whether the “BA” DIP switch (4) is set as follows:
BA
ON
1 2 3 4
D0000057050
15.1.3 LEDs (1)
Red LED
Fault Cause Remedy
Appliance stops and
restarts after the idle
period has expired. Red
LED flashes
Heat pump fault
Check the fault message
in the WPM. Find the solu-
tion in the WPM instruc-
tions (fault list). Perform a
reset of the IWS (see WPM
instructions)
Appliance stops perma-
nently. Red LED illuminates
Five faults within two
hours compressor
runtime
Check the fault message
in the WPM. Find the solu-
tion in the WPM instruc-
tions (fault list). Perform a
reset of the IWS (see WPM
instructions)
Green LED (centre)
The LED flashes during initialisation, and illuminates constantly
after the BUS address has been assigned successfully. Only then
is communication with the WPM established.
Green LED (right)
It is constantly illuminated when STAND-ALONE mode has been
selected.
15.1.4 Reset button
If the IWS was incorrectly initialized, the settings can be reset with
this button. For this also observe the chapter “Reinitialising IWS”
in the heat pump manager operating and installation instructions.
15.2 Cleaning the condensate drain
Environmental conditions may result in the condensate drain be-
coming blocked. To clean the drain, proceed as follows:
DANGER Electrocution!
Before removing the casing components, disconnect all
poles from the power supply.
Remove the casing components
(see chapter “Installation”).
Check the hose and the pipe of the condensate drain.
Remove contaminants and blockages immediately.
Refit the casing components to the appliance (see chapter
“Installation/fitting casing components”).
15.3 Resetting the high limit safety cut-out
The internal second heat source stops if the heating water tem-
perature exceeds 85 °C, i.e. due to a low flow rate.
Remove the cause of the fault.
Reset the high limit safety cut-out. For this, press the button
shown:
C26�03�01�1023
2
1
1 High limit safety cut-out reset button
2 Electric emergency/booster heater (DHC)
15.4 Fan noise
The heat pump draws heat from the outdoor air. This causes the
outdoor air to cool down. At outside temperatures of 0°C to 8°C,
the air may be cooled to below freezing point. If under these
conditions precipitation occurs in the form of rain or fog, ice may
form on the air grille, the fan blades or the airways. If the fan
comes into contact with this ice, noise develops.
How to remedy rhythmic scratching or grinding noises:
Check whether the condensate drain is clear of obstructions.
Carry out a manual defrost, repeatedly if required, until the
fan runs free again.
At outside temperatures above + 1°C, switch the appliance
off for around 1hour or switch it over to emergency mode.
After this, the ice should have melted.
Check whether the appliance is installed in line with the in-
stallation conditions.
If the noises occur frequently, notify customer support.
16. Maintenance
If heat meters are installed, their sieves should be cleaned regu-
larly.
Regularly remove all leaves and accumulated dirt from the evapo-
rator fins, which can be accessed by removing the side a. panel
on the condenser side.
Check whether the heating water is being circulated at a sufficient
flow rate.
We recommend that you perform an annual inspection (to estab-
lish the current condition of the system), and carry out any main-
tenance as required (to return the system to its original condition).
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