5 Care and maintenance
8 Operating instructions Heat pump control interface module 0020291573_00
5 Care and maintenance
5.1 Caring for the product
▶ Clean the casing with a damp cloth and a little solvent-
free soap.
▶ Do not use sprays, scouring agents, detergents, solvents
or cleaning agents that contain chlorine.
5.2 Maintenance
An annual inspection of the product carried out by a compet-
ent person is a prerequisite for ensuring that the product is
permanently ready and safe for operation, reliable, and has a
long working life.
5.3 Reading maintenance messages
If the
symbol is shown in the display, the product requires
maintenance work or the product is in restricted mode (com-
fort protection). The product is not in fault mode; it continues
to operate.
▶ Consult a competent person.
Condition: Lhm. 37 is displayed
The product is in Comfort protection mode. The product has
detected a permanent fault and continues to run with restric-
ted comfort.
5.4 Checking the system pressure
1. Check the filling pressure of the heating installation
every day for a week after initial start-up and mainten-
ance work, and then twice a year.
– Min. heating circuit operating pressure: ≥ 0.07 MPa
(≥ 0.70 bar)
2. Use Menu Live Monitor Water pressure to display the
filling pressure.
3. Inform your competent person so that they can add
heating water and increase the filling pressure and,
in event of frequent pressure losses, determine and
eliminate the cause of the loss of heating water.
6 Troubleshooting
6.1 Reading fault messages
Fault messages have priority over all other displays and are
shown on the display instead of the basic display. If several
faults occur at the same time, these are displayed alternately
for two seconds each.
Depending on the type of fault, the system can work in limp
home mode in order to maintain the heating mode or do-
mestic hot water generation.
F.723 Building circuit: Pressure too low
If the filling pressure falls below the minimum pressure, the
heat pump will be switched off automatically.
▶ Inform your competent person so that he can top up the
heating water.
6.2 Detecting and eliminating faults
▶ If problems occur whilst operating the product, you can
carry out certain checks with the aid of the table.
Troubleshooting (→ Page 9)
▶ If the product is not functioning correctly, even though
you have checked the points listed in the table, contact a
competent person.
7 Decommissioning
7.1 Temporarily decommissioning the product
▶ Use the partition that is installed on-site (e.g. fuses
or power switches) to disconnect the product from the
power supply.
7.2 Permanently decommissioning the product
▶ Have a competent person permanently decommission
and dispose of the product.
8 Recycling and disposal
▶ The competent person who installed your product is re-
sponsible for the disposal of the packaging.
If the product is labelled with this mark:
▶ In this case, do not dispose of the product with the
household waste.
▶ Instead, hand in the product to a collection centre for
waste electrical or electronic equipment.
If the product contains batteries that are labelled with
this mark, these batteries may contain substances that are
hazardous to human health and the environment.
▶ In this case, dispose of the batteries at a collection point
for batteries.
9 Guarantee and customer service
9.1 Guarantee
We only grant a Vaillant manufacturers warranty if a suitably
qualified engineer has installed the system in accordance
with Vaillant instructions. The system owner will be granted
a warranty in accordance with the Vaillant terms and condi-
tions. All requests for work during the guarantee period must
be made to Vaillant Service Solutions.
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