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16.4 Resetting the high limit safety cut-out
The electric emergency/booster heater stops if the heating water
temperature exceeds 85°C, for example if the flow rate is too low.
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1 Electric emergency/booster heater
Remove the cause of the fault.
D0000035383
Reset the high limit safety cut-out by pressing the reset
button.
Check whether the heating water is being circulated at a suf-
ficiently high flow rate.
16.5 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 air routing pipes. If the
fan comes into contact with this ice, this creates noise.
How to remedy rhythmic scratching or grinding noises:
Check whether the condensate drain is clear of obstructions.
Check whether the design output and temperature are set
correctly. Ice formation is particularly pronounced when
a high heating output is demanded at moderate outside
temperatures.
Carry out a manual defrost, as many times as necessary,
until the fan runs freely again. Observe the information in the
WPM instructions and parameter "START DEFROST" in menu
"COMMISSIONING/ COMPRESSOR".
At outside temperatures above +1°C, shut down the appli-
ance or switch it over to emergency mode for approx.1hour.
After this, the ice should have melted.
Check that the appliance is installed in line with the installa-
tion requirements.
If noise occurs frequently, activate intensive defrost. Ob-
serve the information in the WPM instructions and pa-
rameter “POWERDEFROST” in menu “COMMISSIONING/
COMPRESSOR”.
If noise persists, notify the customer service department.
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