Troubleshooting; Detecting And Rectifying Faults - Vaillant aroTHERM VWL 55/2 A Operating Instructions Manual

5 Troubleshooting

5 Troubleshooting

5.1 Detecting and rectifying faults

This section shows all of the fault messages that can be rectified without seeking help
from the competent person in order to start up the product again.
Remedy (→ Page 16)
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If the product still does not function after the fault has been rectified, contact your
competent person.
Fault
The product no longer
works.
Noises (hissing, knocking,
humming)
The product releases
steam.
Other faults
16
Cause
The power supply has been disconnec-
ted
If the heating demand stops, this may lead to bubbling and whistling
noises. These noises are caused by the coolant.
When the product starts up or stops, this may lead to creaking
noises. These noises are caused by the casing as it expands or
contracts when the temperature changes.
If the product is functioning, this may lead to humming noises.
These noises are caused by the compressor when the product is in
heating mode.
In winter and during the thawing procedure, steam may escape
from the product. (The heat of the product melts the ice that has
formed.)
Operating instructions aroTHERM 0020172515_05
Remedy
Ensure that there has
not been a power cut
and that the product is
correctly connected to
the power supply. When
the power supply is re-
established, the product
automatically starts up.
If a fault is still present,
contact your competent
person.
Consult your competent
person.