Switching Off The Product's Functions; Care And Maintenance; Caring For The Product; Maintenance - Vaillant VWL Series Operating Instructions Manual

4.7

Switching off the product's functions

4.7.1 Switching off heating mode (Summer mode)
Condition: No system control connected
▶
Press in the basic display.
▶
Use to change the value to zero and confirm this.
Condition: System control connected
▶
Switch off heating mode on the system control (summer
mode), → System control operating instructions.
4.7.2 Switching off domestic hot water generation
Condition: No system control connected
▶
Press in the basic display.
▶
Use to set the value to zero and confirm this.
Condition: System control connected
▶
Switch off the domestic hot water generation at the sys-
tem control (→ System control operating instructions).
4.7.3 Draining the heating installation
Another way to protect the heating installation and the
product from frost for very long switch-off times is to drain
them completely.
▶
Consult a competent person about this.
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.
Care and maintenance 5
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.
F.1120 Immersion heater: Phase failure
The product has an internal circuit breaker which switches
off the heat pump in the event of short circuits or the failure
of one (product with 230 V power supply) or several (product
with 400 V power supply) current-carrying phases.
If the electric back-up heater is defective, the anti-legionella
function is not always guaranteed.
▶
Inform your competent person so that they can eliminate
the fault and reset the internal circuit breaker.
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 11)
▶
If the product is not functioning correctly, even though
you have checked the points listed in the table, contact a
competent person.
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