Reading The Fault Message; Troubleshooting; Care And Maintenance; Maintenance - Vaillant aroTHERM VWL 55/2 A Operating Instructions Manual

5.2 Reading the fault message

Fault 01/3
Coding resistor
Back
Fault messages have priority over all other
displays and are shown instead of the ba-
sic display. If several faults occur at the
same time, these are each displayed al-
ternately for two seconds each.
▶
If your product displays a fault mes-
sage, contact a competent person.
▶
To find out more information about the
status of your product, call up the "Live
Monitor" (→ Page 13).

5.3 Troubleshooting

5.3.1 Overview of the maintenance
messages
Applicability: Italy
OR Switzerland
The following maintenance messages may
be displayed in the hydraulic station.
Code Meaning Cause
– Insuf-
M.20 Top up
heating
water
0020172515_05 aroTHERM Operating instructions
42
Delete
Remedy
– Add heat-
ficient ing wa-
heat- ter to the
ing wa- product.
ter in the
product

Care and maintenance 6

6 Care and maintenance

6.1 Maintenance

An annual inspection and biennial main-
tenance of the product carried out by a
competent person is a prerequisite for
ensuring that the product is permanently
ready and safe for operation, reliable, and
has a long working life. The inspection
may require maintenance to be carried out
earlier, depending on the results.

6.2 Caring for the product

Caution.
Risk of material damage
caused by unsuitable clean-
ing agents.
▶
Do not use sprays, scouring
agents, detergents, solvents
or cleaning agents that con-
tain chlorine.
▶
Clean the casing with a damp cloth and
a little solvent-free soap.

7 Decommissioning

7.1 Having the product
temporarily decommissioned
▶
If, during long periods of absence, the
power supply to the dwelling and to the
product is interrupted, have the heat-
ing system drained by your competent
person or have it sufficiently protected
against frost.
17