Viessmann VITODENs 200 Installation Instructions Manual page 96

Troubleshooting
Checking and acknowledging faults
Fault code Const.
in the dis-
play
dd
dE
E4 X
E5 X
E6 X
F0 X
80
Weat- System
h. character-
comp. istics
X
X
X Burner
blocked
X Burner
blocked
X Burner in
fault state
X Burner
blocked
(cont.)
Cause
Room temperature
sensor heating cir-
cuit A1 lead break
Heating circuit M2
room temperature
sensor lead break
Fault - supply vol-
tage
Internal fault
Flue gas/air supply
system blocked
Internal fault
Remedy
Check the
room tem-
perature sen-
sor for
heating cir-
cuit A1
Check the
room tem-
perature sen-
sor - heating
circuit M2
Replace con-
trol unit
Check the
ionisation
electrode and
leads. Check
flue gas sys-
tem for
soundness.
Press E
Check the
flue gas/air
supply sys-
tem. Check
the air pres-
sure switch
and the inter-
connecting
cables.
Press E
Replace con-
trol unit