EN-16
9.1
English
The heat pump is blocked. The cause for the block is displayed using the following abbreviations:
ET: The external temperature is lower than -25 °C (or -15 °C) or higher than 35 °C.
OM: When the "Bivalent-alternative" operating mode is selected, the external temperature is
lower than the limit temperature HG2. The 2nd heat generator is released.
BR: When the "Bivalent-regenerative" operating mode is selected, the temperature in the
cylinder is high enough so that all pending requests (heating, hot water or swimming pool) can
be processed by the cylinder.
BF: The current return flow temperature is lower than the set limit.
DHW: Domestic hot water reheating via the 2nd heat generator is active.
SK: A system control was activated in the special functions menu. It will be automatically
deactivated after 24 hours.
EVS: Utility block (EVU) or bridge A1 (ID3-X2) has not been inserted.
Def: With measure defrost active the usual lowering of the flow temperature during defrosting
did not occur.
PR: The current pressure value in the refrigerant circuit is above the permitted limit.
FR: The flow rate switch of the primary or secondary side has not detected any flow rate.
The heat pump is switched off because the operating mode, 2nd heat generator (HG2), was
selected. Heat generation is provided by the 2nd heat generator.
Flow rate monitoring of the heating water takes place before evaporator defrosting is started. This
applies to air-to-water heat pumps only. This process lasts a maximum of 4 minutes.
The heat pump defrosts the evaporator. This process lasts a maximum of 8 minutes.
The maximum flow temperature was overshot. Once the temperature drops, the HP will start again
automatically (HT HP only).
Switching to and from the cooling operating mode activates a time delay of 5 minutes. The heat
pump remains switched off during this period.
Despite a pending request, the chiller is unable to cool because 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 was
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 was undershot. This state is ended
automatically.
The heat pump operates in passive cooling and no requests are pending.
The external temperature is below the permissible cooling temperature limit.
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