Operating instructions

96
Displayed
fault code
System characteris-
tics
Cause Measures
dd Control mode without
room influence
Lead break, room
temperature sen-
sor, heating circuit
without mixer A1
(heating circuit 1)
Check room temperature
sensor (see page 185).
dE Control mode without
room influence
Lead break, room
temperature sen-
sor, heating circuit
with mixer M2
(heating circuit 2)
Check room temperature
sensor (see page 185).
dF Control mode without
room influence
Lead break, room
temperature sen-
sor, heating circuit
with mixer M3
(heating circuit 3)
Check room temperature
sensor (see page 185).
Note
If subscriber faults occur, "Subscriber
fault ..." is displayed.
Troubleshooting Vitotronic 300-K
Fault codes
(cont.)
5815 091 GB