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83052300eUK © ait-deutschland GmbH
No.. Display Description Remedy
701
Error low pressure.
Please call tter
Low pressure pressostat in the cooling circle has
responded (LW) or for longer than 20 seconds
(SW).
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, au-
tomated HP restart
Check HP for leakage, switching
point pressure state, defrosting and
T-outd.min.
703
Antifreeze
Please call tter
Only possible for L/W devices: If the heat pump is
running and the temperature in ow is < 5 °C, anti-
freeze 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 ow, return and HS-min.
705
Motor protection VEN
Please call tter
Motor protection has responded Check set value and ventilator / BCP.
706
Motor protection BCP
Please call tter
Option only possible for S/W- or W/W devices
Motor protection of the brine or well water circu-
lating pump or the compressor has responded
Check set values, compressor, BOS.
707
Coding of HP
Please call tter
Break or short-circuit of the coding bridge in HP
after the rst switch-on
Coding resistance in HP, check plug
and connection line.
708
Return sensor
Please call tter
Break or short-circuit in the return sensor
Check return sensor, plug and con-
nection line.
709
Flow sensor
Please call tter
Break or short-circuit in the ow sensor No fault
shutdown for S/W- or W/W devices
Check ow sensor, plug and connec-
tion line.
710
Hot gas sensor
Please call tter
Break or short-circuit in the hot gas sensor of the
cooling circle
Check hot gas sensor, plug and con-
nection line.
711
External temp. sensor
Please call tter
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 tter
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 tter
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
Check ow 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 ow of HW, overows, temper-
ature and condensation.
716
High-pressure fault
Please call tter
High pressure pressostat in the cooling circle has
responded several times.
Check ow of HW, overows, temper-
ature and condensation.
717
Flow HS
Please call tter
Flow switch for W/W devices has responded during
the pre-rinsing time or operation
Check ow, switching point for DFS,
lter, air clearance. .
718
Max. outside temp.
RESET autom. in hh:mm
Only possible for L/W devices: Outside tempera-
ture 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 temper-
ature 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 Tem-
perature at evaporation outlet has fallen below the
safety value on the HS side several times. Auto-
matic HP restart after hh:mm
Check ow, lter, air clearance, tem-
perature.
721
Low-pressure switch-off
RESET autom.
Low pressure pressostat in the cooling circle has
responded. After some time, automated HP restart
(SW and SW)
Check switching point of the pres-
sostat, ow on HS side.
Error Diagnosis / Error messages
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