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5.4.6
Activating Cylinder boost
Op. mode → Cylinder boost
–
The Cylinder boost advanced function heats the water
in the domestic hot water cylinder until it reaches the set
desired temperature Domestic hot water.
The advanced function is active for one hour unless you can-
cel it sooner. The heating installation then returns to the pre-
set operating mode.
5.4.7
Activating System OFF active
Op. mode → System OFF active
–
The System OFF active advanced function switches off
the heating function, the domestic hot water circuit, the
circulation and the cooling. The frost protection function
is activated.
Ventilation is activated and works at the lowest ventilation
level.
The advanced function is deactivated by cancelling the ad-
vanced function. The heating installation will then return to
the pre-set mode.
5.5
Messages
5.5.1
Maintenance message
Maintenance messages (→ Appendix C)
If maintenance is required, the system control displays a
maintenance message in the display.
To prevent the heating installation from breaking down and
to prevent damage, you must pay attention to the mainten-
ance message:
▶
Observe the operating instructions for the unit shown.
▶
Only carry out the maintenance instructions that are de-
scribed in the operating instructions for the unit shown.
▶
For all other maintenance instructions, inform the com-
petent person.
5.5.2
Fault message
Fault messages (→ Appendix B)
A fault message with fault code (e.g. F.33) and the affected
heat generator appear in the system control's display.
▶
Press the Reset selection button.
–
Heat generator fault clearance? appears in the
display.
▶
Press the OK selection button.
–
Faults are cleared for the heat generator briefly
appears in the display.
▶
If the fault persists, inform the competent person.
If you would like to see the basic display on the display
again, press the left-hand selection button Back.
You can read the current fault messages under Menu → In-
formation → System status → Fault status. As soon as a
fault message occurs for the heating installation, the setting
level displays the value Fault list. The right-hand selection
button has been assigned the Display function.
0020237621_02 Operating instructions
6
Troubleshooting
Overview of fault messages (→ Appendix B)
6.1
Implementing the setting if the heat pump
fails
If the fault message Restricted operation/ comfort pro-
tection Inactive appears on the display, the heat pump has
failed and the system control enters limp home mode. The
back-up boiler now supplies the heating installation with
heating energy. During installation, the competent person
has restricted the temperature for limp home mode. You can
feel that the domestic hot water and heating are not becom-
ing very hot.
While you wait for the competent person to come, you can
use the rotary knob to implement the following settings:
Inactive: The system control works in limp home mode;
heating and domestic hot water become moderately hot.
Heating: The back-up boiler takes over the heating mode;
the heating becomes hot, the domestic hot water is cold.
DHW: The back-up boiler takes over the domestic hot water
mode; the domestic hot water becomes hot, the heating is
cold.
DHW+heat.: The back-up boiler takes over the heating and
domestic hot water mode; the heating and the domestic hot
water become hot.
The back-up boiler is not as efficient as the heat pump,
meaning that using only the back-up boiler to generate heat
is expensive.
If you want to implement settings on the system control, click
Back and the basic display appears in the display. After five
minutes of no operation, the fault message appears again in
the display.
6.2
Cleaning the outdoor temperature sensor
▶
Clean the solar cell with a damp cloth and a little solvent-
free soap. Do not use sprays, scouring agents, deter-
gents, solvents or cleaning agents that contain chlorine.
Note
After you have cleaned the solar cell, there is
a delay before the fault message disappears
because the battery has to be recharged first.
6.3
Changing the batteries
Danger!
Risk of death caused by unsuitable batter-
ies!
If batteries are replaced with the wrong type
of battery, there is a risk of explosion.
▶
Ensure that you use the correct battery
type when replacing batteries.
▶
Dispose of used batteries in accordance
with the instructions in this manual.
Troubleshooting 6
19
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Table of Contents
Troubleshooting
