INSTALLATION
Troubleshooting
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| WPL ACS classic www.stiebel-eltron.com
15.4 Fan noise
The heat pump extracts 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 air routing pipes. If the
fan comes into contact with this ice, noise develops.
How to remedy rhythmic scratching or grinding noises:
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Check whether condensate can drain freely from the
appliance.
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Check whether the design output and temperature are set
correctly. Ice formation is particularly pronounced when
a high heating output is called for at moderate outside
temperatures.
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Carry out a manual defrost, repeatedly if required, until the
fan runs free again. Observe the information in the operating
and installation instructions for the heat pump manager and
the "START DEFROST" parameter in the "COMMISSIONING /
COMPRESSOR" menu.
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At outside temperatures above + 1 °C, switch the appliance
off for around 1 hour or switch it over to emergency mode.
After this, the ice should have melted.
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Check whether the appliance is installed in line with the in-
stallation conditions.
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If noise occurs frequently, notify the service department.
