Troubleshooting
85
Diagnosis
(continued)
Faults with fault display on the programming unit
(continued)
Fault code
in display
Behaviour of system
Cause of fault
Action
dc
Controlled operation without
influence of room temperature
Short circuit
Room temperature sensor,
mixing valve circuit M3
Check room temperature sensor
(see page 112)
dd
Controlled operation without
influence of room temperature
Open circuit
Room temperature sensor,
system circuit A1
Check room temperature sensor
(see page 112)
de
Controlled operation without
influence of room temperature
Open circuit
Room temperature sensor,
mixing valve circuit M2
Check room temperature sensor
(see page 112)
df
Controlled operation without
influence of room temperature
Open circuit
Room temperature sensor,
mixing valve circuit M3
Check room temperature sensor
(see page 112)
e0
Controlled operation
Open circuit
LON communication module
Check connection
(see page 96)
Retrieving fault codes from the fault memory (fault history)
All faults which have occurred are stored and can be retrieved by scanning.
The scanning sequence starts with the most recently stored fault code.
1.
Press
and
simultaneously for
approx. 2 seconds.
Scanning of fault history is
activated.
2.
Access the individual fault codes by
pressing the
or
button.
Sequence of
stored fault
codes
Fault code
1
Last (most recent)
fault code
..
.
..
.
10
Last fault code but
nine
3.
Press
.
All stored fault codes can be
deleted by pressing
.
Scanning of fault history is
terminated.
5285
941
-
0
1
1 2 3 4 5 6 7
