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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
(comfort 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 filling pressure of the heating
installation
Note
To avoid operating the installation with insufficient
water volume and to prevent possible damage
associated with this, the product is fitted with a
pressure sensor and a digital pressure display.
To ensure that the heating installation operates
properly, the filling pressure must be between 0.1
MPa and 0.15 MPa (1.0 bar and 1.5 bar) when the
heating installation condition is cold.
If the heating installation extends over several
storeys, a higher filling pressure may be required
for the heating installation. Ask a competent per-
son for details.
Note
If the pressure falls below 0.07 MPa (0.7 bar),
message M32 appears.
If the pressure rises above 0.07 MPa (0.7 bar),
message M32 goes out.
In addition, the
prox. one minute.
If the filling pressure of the heating installation
falls below 0.05 MPa (0.5 bar) for longer than one
minute, fault message F.22 and the current filling
pressure appear alternately in the display.
If the blocking time has elapsed or if the filling
pressure of the heating installation rises above
0.05 MPa (0.5 bar), fault message F.22 goes out.
0020291544_03 Operating instructions
symbol is displayed after ap-
Use Menu → Live Monitor Water pressure to display
1.
the filling pressure of the heating installation.
2.
If the pressure drops frequently, identify and eliminate
the reason for the pressure loss of heating water. In-
form a competent person of this.
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 (→ Appendix A)
▶
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.
11
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Troubleshooting
