40 Subject to technical amendments without prior notice | 83055400iUK – 2.1 | ait-deutschland GmbH
No. Display Description Remedy
724 Tempdi defrosting
Please call tter
Temperature spread in the heating circle is > 15 K during
defrosting (=danger of frost).
Check function and location of the ow and
return sensor, HCP capacity, overows and
heating circles.
725 System error DHW
Please call tter
Domestic hot water faulty, desired tank temperature is fallen
below substantially.
Check circulating pump DHW, tank lling,
shuto move and 3-way valve. Ventilate hot
water and SW.
726 Sensor mixing circ 1
Please call tter
Break or short-circuit in the mixing circle sensor. Check mixing circle sensor, plug and
connection line.
727 Brine pressure
Please call tter
Brine pressure pressostat has responded during the pre-rinsing
time or during operation.
Check brine pressure and brine pressure
pressostat.
728 Sensor HS O
Please call tter
Break or short-circuit in the heat source sensor at the HS outlet. Check heat source sensor, plug and
connection line.
729 Rotating eld error
Please call tter
Compressor without power after switching on. Check rotating eld and compressor.
730 Screed heating error
Please call tter
The screed heating program could not reach an FL temperature
level in the specied time interval. Screed heating program
continues running.
The screed heating program could not
reach an FL temperature level in the
specied time interval. Screed heating
program continues running.
731 Timeout TDI The temperature required for thermal disinfection could not be
reached within the set switching times.
732 Cooling fault
Please call tter
The hot water temperature of 16 °C has been fallen short of
several times.
Check mixer and heating circulation pump.
733 Anode fault
Please call tter
Fault input of the impressed current anode has responded. Check connection line between anode and
potentio stat. Fill SW tank.
734 Anode fault
Please call tter
Error 733 present for more than two weeks and domestic hot
water is locked.
Acknowledge error in order to release
domestic hot water preparation again.
Rectify 733.
735 Error Ext. En
Please call tter
Only possible with installed expansion board: Break or short-
circuit in the sensor “External energy source”.
Check sensor “External energy source”, plug
and connection line.
736 Error solar collector
Please call tter
Only possible with installed expansion board: Break or short-
circuit in the “solar collector” sensor.
Check “solar tank” sensor, plug and
connection line.
737 Error solar tank
Please call tter
Only possible with installed expansion board: Break or short-
circuit in the “solar tank” sensor.
Check “solar tank” sensor, plug and
connection line.
738 Error mixing circle 2
Please call tter
Only possible with installed expansion board: Break or short-
circuit in the “mixing circle 2” sensor.
Check “mixing circle 2” sensor, plug and
connection line.
739 Error mixing circle 3
Please call tter
Only possible with installed expansion board: Break or short-
circuit in the “mixing circle 3” sensor.
Check “mixing circle 3” sensor, plug and
connection line.
750 Return sensor external
Please call tter
Break or short-circuit in the external return sensor. Check external return sensor, plug and
connection line.
751 Phase monitoring fault Phase-sequence relay has responded. Check rotary eld and phase-sequence
relay.
752 Flow error Phase-sequence relay or ow switch has responded. see errors No. 751 and No. 717.
755 Lost connection to slave
Please call tter
A slave has not responded for more than 5 minutes. Check network connection, switch, and IP
addresses. Perform HP search if necessary.
756 Lost connection to master
Please call tter
A master has not responded for more than 5 minutes. Check network connection, switch, and IP
addresses. Perform HP search if necessary.
757 Low-pressure fault in W/W-
appliance
Low-pressure pressostat in the W/W-appliance has triggered
either repeatedly or for more than 20 seconds.
If this malfunction occurs three times, the
installation can only be cleared again by
authorised service personnel!
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 ow rate.
Check ow sensor.
759 TDI message Unable to correctly carry out thermal disinfection 5 times in
succession.
Check setting of additional heat generator
and safety temperature limiter.
760 Defrosting fault Defrosting ended 5 times in succession by maximum time
(strong wind impinges on evaporator) .
Protect the fan and evaporator from strong
wind.
761 LIN timeout LIN connection interrupted Check cable/contact.
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