E-14
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9.2
9.2 Fault Messages
Fault Messages on the display fall into three broad categories:
Heat pump fault
Plant fault and
Sensor fault
You only need to inform your after-sales service if there is a heat
pump fault (HP fault). Make a note of the error message and the
software version displayed in the operating data. After rectifying
the problem, press the Esc button to acknowledge the fault.
The following messages may appear on the display.
NOTE
Plant fault
In mono energy systems, the minimum return set temperature is set if a
heat pump or plant fault occurs. Antifreeze (frost protection) is ensured.
By manually switching to the 2nd heat generator operating mode, the
building is heated exclusively using the immersion heater.
Despite a pending request, the chiller is unable to cool because antifreeze (frost protection) was
activated. This state is ended automatically.
Despite a pending request, the chiller is unable to cool because the current flow temperature is
under the operating limit. This state is ended automatically.
Despite a pending request, the chiller is unable to cool because the dew point monitor has been
activated (external input). This state is ended automatically.
Despite a pending request, the chiller is unable to cool because the dew point calculated from the
sensor values from the room climate control stations has been undershot. This state is ended
automatically.
The heat pump operates in passive cooling and no requests are pending.
A heat pump fault indicates a defect in the heat pump. Inform your after-sales service. Details
of the fault (display), the heat pump designation (type plate) and the software version of the heat
pump manager (operating data) are required for rapid and precise troubleshooting. Depending on
the system type, the following heat pump faults may appear on the display:
Low pressure
Hot gas thermostat
Antifreeze
Temp. difference
Motor prot.compr
A plant fault indicates a defect or a false setting in the heat pump system. Inform your local
technician. Details of the fault, the heat pump designation and the software version of the
controller are required for rapid and precise troubleshooting. Depending on the system type, the
following plant faults may appear on the display:
Motor prot. Primary
Flow rate well
High pressure
As with a plant fault, this can be caused by a breakage or a sensor which is short circuiting. Inform
your local technician. Details of the fault, the heat pump designation and the software version of
the controller are required for rapid and precise troubleshooting. Depending on the system type,
the following sensors may be defective:
Return flow sensor
Flow temperature limit sensor
Hot water sensor
Flow sensor
2./3. Sensor for heating circuit 2/3
External sensor
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