Operating instructions
116
Troubleshooting
Faults which are displayed at the programming unit (cont.)
Fault
code
System
characteristics
Cause Remedy
aa
Control mode ThermControl
configuration error
Plug aJA of
ThermControl
temperature sensor
not inserted
Insert plug aJA
Code "0d:0" must
be set for
Vitocrossal
ab
Controlled
operation, perhaps
DHW cylinder cold
Cylinder storage
system
configuration error:
Code "55:3" has
been set, but
plug aJB is not
plugged in
and/or
Code "4C:1" and
"4E:1" have not
been set
Insert plug aJB
and check code
ac
Control mode Return temperature
raising
configuration error:
Code "0C:1" has
been set, but
plug aJA is not
plugged in
and/or
Code "4E:0" is not
set
Insert plug aJA
and check code
ad
Butterfly valve
configuration error:
Code "0C:2",
"0C:3" or "0C:4" is
set
and
Code "4E:1" is set
With butterfly valve:
Code "4E:0" is set
Without butterfly
valve: Set code
"0C:0" or "0C:1"
bC0
Short circuit
Flue gas
temperature sensor
Check flue gas
temperature sensor
(see page 132)
5862730GB