Information/Alarms
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5.6.8 Failure on sensor T10 (B)
Failure on sensor T11 (B)
Function: The sensor's value is indicated with NaN in the
control unit.
Heat pump: All.
B Check the installation of the sensor.
B Check the connection, measure the resistance and
compare with the resistance table.
B Replace the sensor if necessary.
5.6.9 Operating error compressor (B)
Function: No operation response from the compressor.
E21: Additional heat permitted to start.
Heat pump: All.
B Use the relevant wiring diagram for the heat pump
and follow the operation response signal from the
control unit via connected components.
B Identify where the signal is interrupted incorrectly.
5.6.10 Operating error add. heat (B)
Function: With internal electric additional heat, the
overheat protection has tripped. With external
additional heat, thermostat E71.E1.B31 has not given a
signal within 30 minutes of additional heat operation.
Heat pump: E21.
B Check additional heat and overheat protection/
thermostat.
5.6.11 Operating error pump G2 (B)
Operating error pump G3 (B)
Function: The compressor is stopped. Activated when
the SSM signal from the circulation pump has been
broken for more than 3 minutes. E21: Internal electric
additional heat is permitted to start at operating error
G3.
Heat pump: All.
B Interrupt the current for at least 5 seconds to reset
the alarms (Æ Chapter Resetting the pump alarm in
the installation guide for the heat pump).
B Check that the circulation pump can operate.
B Check the connection for the 0-10V signal.
B Vent the heating system if necessary.
5.6.12 High temp. T6 hot gas (B)
Function: The compressor is stopped because T6 shows
more than 125 °C. Restart is permitted when T6 shows
less than 115 °C. E21: Additional heat permitted to start.
Activated when the corresponding category C-alarm has
occurred more than once during the last 120 minutes.
Heat pump: All.
B Check that the sensor shows a reasonable value.
B Check the connection, measure the resistance and
compare with the resistance table.
B At correct sensor, check that the refrigerant circuit
can dispose of the heat.
5.6.13 Tripped high pressure switch (B)
Function: The compressor is stopped. E21: Additional
heat permitted to start.
Activated when the corresponding category C-alarm has
occurred more than once during the last 120 minutes.
The alarm can also be caused by a faulty system
configuration.
Heat pump: All.
B Check the particle filter and clean if necessary.
B Check the valves.
B Check the heating system pressure, vent if necessary.
B
Check the flow over the condenser.
B Check the pressure switch and its connections.
B Check heat carrier pump G2.
B Ensure that there is no risk of large sudden
temperature increases across the heat pump.
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