Viessmann VITOPEND 200 - Page 84

Fault
code
on the
display
Const. Weath.-
comp.
System char-
acteristics
Cause Measures
CF X Control mode Communica-
tion fault -
LON com-
munication
module
Replace the LON
communication
module
dA X Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit A1
shorted out
Check the room
temperature sen-
sor, heating cir-
cuit A1
db X Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit
with mixer
M2 shorted
out
Check the room
temperature sen-
sor, heating cir-
cuit with mixer M2
dd X Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit A1
lead broken
Check the room
temperature sen-
sor, heating cir-
cuit A1 and the
remote control
DIP switch set-
tings (see
page 110)
dE X Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit
with mixer
M2 lead bro-
ken
Check the room
temperature sen-
sor, heating cir-
cuit with mixer M2
and the remote
control DIP switch
settings (see
page 110)
E4 X X Burner
blocked
Fault, supply
voltage 24 V
Replace the con-
trol unit
E5 X X Burner
blocked
Fault, flame
amplifier
Replace the con-
trol unit.
Fault codes (cont.)
84
Troubleshooting
5862 831 GB