74
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83052300eUK © ait-deutschland GmbH
No.. Display Description Remedy
757
Low-pressure fault in SW-
appliance
Low-pressure pressostat in the SW-appliance has
triggered either repeatedly or for more than 20 sec-
onds,
If this malfunction occurs three times,
the installation can only be cleared
again by authorised service per-
sonnel!
758 Defrosting malfunction
Five times in a row, defrosting has either lasted
longer than 10 minutes or was terminated with a
feed temperature of < 10 °C
– Check for icing-up of the evaporator
– Check on output of the HUP at
limits specied for heating water
– Check heating pump for leaks
– Check switch setting for AEP
759 TDI message
Unable to correctly carry out thermal disinfection 5
times in succession
Check setting of second heat gener-
ator and safety temperature limiter
760 Defrosting fault
Defrosting ended 5 times in succession by max-
imum time (strong wind impinges on evaporator)
Protect the fan and evaporator from
strong wind
761 LIN timeout LIN timeout Check cable/contact
762 sensor (evaporator intake) Tü sensor error
(evaporator intake)
Check sensor, replace if necessary
763 sensor (compressor
intake)
Tü1 sensor error
(compressor intake)
Check sensor, replace if necessary
764 Sensor Compressor heater Sensor error
Compressor heater
Check sensor, replace if necessary
765 Overheating Overheating longer than 5 minutes below 2K When switching on for the rst time,
check rotary eld, otherwise phone
customer service
766 compressor's functional
range
Operation for 5 minutes outside the compressor's
functional range
Check rotary eld
767
STB E-Rod STB of the heating element has been activated
at the SEC
Check the heating element and
press the fuse back in
770
Low superheat Overheating lies below the limit value for a
lengthy period
Check the temperature sensor,
pressure sensor and expansion
valve
771
High superheat Overheating lies below the limit value for a
lengthy period
Check the temperature sensor,
pressure sensor, ll quantity and
expansion valve
776
limit of application-CP Compressor operates outside its use limits for a
lengthy period
Check the thermodynamics
777
Expansion valve Expansion valve is defective Check the expansion valve,
connection cable and if applicable
the SEC board
778
Low pressure sensor Low-pressure sensor is defective Check the sensor, connector and
connection cable
779
High pressure sensor High-pressure sensor is defective Check the sensor, connector and
connection cable
780
EVI sensor EVI sensor is defective Check the sensor, connector and
connection cable
781
Liquid temp. sensor
before EXV
Liquid temperature sensor upstream of the ex-
valve is defective
Check the sensor, connector and
connection cable
782
Suction gas EVI temp.
sensor
Suction gas EVI temperature sensor is defective Check the sensor, connector and
connection cable
783
Communication SEC -
Inverter
Communication between the SEC & the inverter
is disrupted
Check the connection cable,
interference suppression
capacitors and wiring
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