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83052300eUK © ait-deutschland GmbH
No.. Display Description Remedy
722
Tempdiff HW
Please call tter
Temperature spread in the heating mode is nega-
tive (=erroneous)
Check function and location of the
ow and return sensor.
723
Tempdiff SW
Please call tter
Temperature spread in the domestic hot water
mode is negative (=erroneous)
Check function and location of the
ow and return sensor.
724
Tempdiff 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 SW
Please call tter
Domestic hot water faulty, desired tank tempera-
ture is fallen below substantially
Check circulating pump HW, tank
lling, shutoff 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 pres-
sure pressostat.
728
Sensor HS Off
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.
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 re-
sponded
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 do-
mestic 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 Comfort / 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 Comfort / 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 Comfort / 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 Comfort / expansion
board: Break or short-circuit in the “mixing circle 2”
sensor
Check “mixing circle 2” 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-se-
quence relay.
752 Flow error
Phase-sequence relay or ow switch has re-
sponded
see errors No. 751 and No. 717
755
Lost connection to slave
Please call tter
A slave has not responded for more than 5 min-
utes.
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 min-
utes.
Check network connection, switch,
and IP addresses. Perform HP
search if necessary.
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