Operating instructions

Fault code
in the dis-
play
Const. Weat-
h.
comp.
System
character-
istics
Cause Remedy
dd X Room tempe rature
sensor hea ting cir-
cuit A1 lead break
Check the
room tem-
perature sen-
sor - heating
circuit A1
dE X Heating c ircuit M2
room temperature
sensor lead break
Check the
room tem-
perature sen-
sor - heating
circuit M2
E4 X X Burner
blocked
Fault - supply vol-
tage
Replace con-
trol unit
E5 X X Burner
blocked
Internal error Check the
ionisation
electrode and
leads. Check
flue gas sys-
tem for
soundness.
Press E .
E6 X X Burner in
fault state
Flue gas/air supply
system blocked
Check the
flue gas/air
supply sys-
tem. Check
the differen-
tial pressure
sensor.
Press E .
F0 X X Burner
blocked
Internal error Replace con-
trol unit
F1 X X Burner in
fault state
Flue gas tempera-
ture limiter has
responded
Check the
heating sys-
tem water
level. Vent
the heating
system.
Press res et
E no sooner
than after
20 minutes.
Checking and acknowledging faults (cont.)
80
Troubleshooting
5692 548 GB