Display fault
code
System char-
acteristics
Cause Measures
CF Control mode Communication fault –
LON communication
module
Replace the LON
communication
module
dA Control mode
without room
influence
Room temperature sen-
sor, heating circuit A1
shorted out
Check the room
temperature sen-
sor – heating cir-
cuit A1
db Room temperature sen-
sor, heating circuit with
mixer M2 shorted out
Check the room
temperature sen-
sor – heating cir-
cuit with mixer M2
dd Room temperature sen-
sor, heating circuit A1
lead broken
Check the room
temperature sen-
sor, heating circuit
A1 and the remote
control DIP switch
settings (see
page 97)
dE Room temperature sen-
sor, heating circuit with
mixer M2 lead broken
Check the room
temperature sen-
sor, heating circuit
with mixer M2 and
the remote control
DIP switch set-
tings (see
page 97)
E4 Burner
blocked
Supply voltage fault Replace the con-
trol unit
E5 Burner control
unit fault
Internal fault Replace the con-
trol unit
Press "E".
E6 Burner control
unit fault
The oil preheater does
not respond inside the tol-
erated time
Check the oil pre-
heater and re-
place, if required
Press "E".
F0 Burner
blocked
Internal fault Replace the con-
trol unit
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