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Subject to technical amendments without prior notice | 83055400iUK – 2.1 | ait-deutschland GmbH
Error Diagnosis / Error messages
No.
Display
Description
Remedy
701
Error low pressure.
Please call AS
Low pressure pressostat or low-pressure sensor in the cooling
circle has responded (L/W) or for longer than 20 seconds (S/W).
Check HP for leakage, switching point
pressure state, defrosting and T-outd.min.
702
Low pressure stop
RESET autom.
Only possible for L/W devices: Low pressure in the cooling circle
has responded. After some time, automated HP restart.
Check HP for leakage, switching point
pressure state, defrosting and T-outd.min.
703
Antifreeze
Please call fitter
Only possible for L/W devices: If the heat pump is running and
the temperature in flow is < 5 °C, antifreeze is detected.
Check HP power, defrost valve and heating
system.
704
Error hot gas
Reset in hh:mm
Maximum temperature in the hot gas cooling circle exceeded.
Automatic HP restart after hh:mm.
Check coolant quantity, evaporation,
overheating flow, return and HS-min.
705
Motor protection VEN
Please call fitter
Only possible for L/W devices: Motor protection has responded. Check set value and ventilator / BCP.
706
Motor protection BCP
Please call fitter
Option only possible for S/W- or W/W devices Motor protection
of the brine or well water circulating pump or the compressor
has responded.
Check set values, compressor, BOS.
707
Coding of HP
Please call fitter
Break or short-circuit of the coding bridge in HP after the first
switch-on.
Coding resistance in HP, check plug and
connection line.
708
Return sensor
Please call fitter
Break or short-circuit in the return sensor.
Check return sensor, plug and connection
line.
709
Flow sensor
Please call fitter
Break or short-circuit in the flow sensor No fault shutdown for
S/W- or W/W devices.
Check flow sensor, plug and connection
line.
710
Hot gas sensor
Please call fitter
Break or short-circuit in the hot gas sensor of the cooling circle. Check hot gas sensor, plug and connection
line.
711
External temp. sensor
Please call fitter
Break or short-circuit in the external temperature sensor No
fault shutdown. Fixed value to -5 °C.
Check external temperature sensor, plug
and connection line.
712
Domestic hot water sensor.
Please call fitter
Break or short-circuit in the domestic hot water sensor No fault
shutdown.
Check domestic hot water sensor, plug and
connection line.
713
HS-on sensor
Please call fitter
Break or short-circuit in the heat source sensor (inlet).
Check heat source sensor, plug and
connection line.
714
Hot gas SW
Reset in hh:mm
Check thermal application limit of the HP. Domestic hot water
off for hh:mm.
Fault only triggers if the compressor is running.
Check flow of domestic hot water, heat
exchanger, domestic hot water temperature
and circulation pump.
715
High-pressure switch-off
RESET autom.
High pressure in the cooling circle has responded. After some
time, automated HP restart.
Check flow of HW, overflows, temperature
and condensation.
716
High-pressure fault
Please call fitter
High pressure pressostat in the cooling circle has responded
several times.
Check flow of HW, overflows, temperature
and condensation.
717
Flow HS
Please call fitter
Flow switch for W/W devices has responded during the pre-
rinsing time or operation.
Check flow, switching point for DFS, filter,
air clearance.
718
Max. outside temp.
RESET autom. in hh:mm
Only possible for L/W devices: Outside temperature has
exceeded permissible maximum value. Automatic HP restart
after hh:mm.
Check outside temperature and set value.
719
Min. outside temp.
RESET autom. in hh:mm
Only possible for L/W devices: Outside temperature has fallen
below the permissible minimum value. Automatic HP restart
after hh:mm.
Check outside temperature and set value.
720
HS temperature
RESET autom. in hh:mm
Option only possible for S/W- or W/W devices Temperature at
evaporation outlet has fallen below the safety value on the HS
side several times. Automatic HP restart after hh:mm.
Check flow, filter, air clearance, temperature.
721
Low-pressure switch-off
RESET autom.
Low pressure pressostat or low-pressure sensor in the cooling
circle has responded. After some time, automated HP restart
(S/W and W/W).
Check switching point of the pressostat,
flow on HS side.
722
Tempdiff HW
Please call fitter
Temperature spread in the heating mode is negative
(=erroneous).
Check function and location of the flow and
return sensor.
723
Tempdiff SW
Please call fitter
Temperature spread in the domestic hot water mode is
negative (=erroneous).
Check function and location of the flow and
return sensor.
