Viessmann Vitodens 300 - Page 81

Displayed
fault c ode
Con-
st.
Weat -
her-
com-
p.
System
character-
istics
Cause Remedy
C2 X X Control
mode
Communica-
tion fault -
solar control
unit
Check connecti ons
andcodingaddress
54
C5 X X Control
mode,
max. pump
speed
Communica-
tion fault -
variable speed
internal pump
Check codin g
address 30 set-
tings; check the DIP
switch settings in
thepumpwiring
chamber:
Switch 1: OFF (as
delivered condition)
Switch 2: OFF (as
delivered condition)
C6 X Control
mode,
max. pump
speed
Communica-
tion fault -
variable speed
heating circuit
pump, heating
circuit M2
Check codin g
address E5 set-
tings; check the DIP
switch settings in
thepumpwiring
chamber:
Switch 1: OFF
Switch 2: ON
C7 X X Control
mode,
max. pump
speed
Communica-
tion fault -
variable speed
heating circuit
pump, heating
circuit A1
Check codin g
address E5 set-
tings; check the DIP
switch settings in
thepumpwiring
chamber:
Switch 1: ON
Switch 2: OFF
Cd X X Control
mode
Communica-
tion fault Vito-
com 100 (KM
BUS)
Check connecti ons
and Vitocom 100
CE X X Control
mode
Communica-
tion fault - ext.
extension
Check connecti ons
andcodingaddress
2E settings
Checking and acknowledging faults (cont.)
81
Troubleshooting
5692 537 GB