Operating instructions

Constant temperature control units
Note
Thefaultcanbeacknowledged
with d . The fault message i n the dis-
play will be hidden, but the red fault
indicator U continues to flash. A new
fault message wi ll be displayed if a n
acknowledged fault is not removed by
the following morning.
Calling up acknowledged fault mes-
sages
Press d for approx. 2 seco nds;
select the acknowledge d fault with a
or b .
Fault code
in the dis-
play
Const. Weat-
h.
comp.
System
character-
istics
Cause Remedy
0F X X Control
mode
Maintenance Carry out
maintenance.
Set code 24:0
after mainte-
nance.
10 X X Controls
according
to0°Cout-
side tem-
perature
Outside tempera-
ture sensor shor ted
out
Check the
outside tem-
perature sen-
sor (see
page 84)
18 X X Outside tempera-
ture sensor lead
break
20 X X Controls
without
flow tem-
perature
sensor
(low loss
header)
System flow tem-
perature sensor
shorted out
Check the
low loss
header sen-
sor (see
page 85).
28 X X System flow tem-
perature sensor
lead brea k
Checking and acknowledging faults (cont.)
75
Troubleshooting
5692 548 GB