www.stiebel-eltron.com WPL 33 | 23
INSTALLATION
Maintenance
16.3 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.
17. Maintenance
We recommend that you perform an annual inspection (to es-
tablish the current condition of the system), and carry out any
maintenance as required (to return the system into its original
condition).
If heat meters are installed, their sieves should be cleaned reg-
ularly.
Regularly remove all leaves and accumulated dirt from the evap-
orator fins, which can be accessed by removing the side panel on
the condenser side.
Check the condensate drain is working correctly. Remove any
contamination.
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