Viessmann VITODENS 200-W Service Instructions Manual page 74

Troubleshooting
Fault Codes
(continued)
Fault code Detailed fault
on display code*2
BD -
BE -
BF -
C1 -
C2 -
C3 -
C4 -
C5 -
CD -
NOT
USED
CF -
D6 -
D7 -
*1 Control mode: Boiler/burner fully operational (fault code must be verified and reset).
Burner in fault mode: Boiler control requires manual reset before burner can resume operation.
Burner blocked: If fault cause is corrected, burner resumes operation.
*2 Detailed fault code coding address 38:xx (if available).
74
System behavior*1
Control mode without remote
control
Control mode with out
remote control
Control mode
Control mode
Control mode
Control mode
Control mode
Control mode, max. pump
speed
Control mode
Control mode
Control mode
Control mode
Vitodens 200-W B2HA 19, 28, 35 Service
Cause
Communication error,
remote control Vitotrol
heating circuit 2
(with mixing valve)
Communication error,
remote control Vitotrol
heating circuit 3
(with mixing valve)
Incorrect LON
communication module
Communication fault
extension EA1
Communication fault -
solar control unit or
Vitosolic
Extension AM1
communication fault
Communication fault,
Open Therm extension
Communication error,
variable speed internal
pump
Communication fault,
Vitocom 100 (KM-BUS)
Communication fault -
LON communication
module
Input DE1 reports a
fault at extension EA1
Input DE2 reports a
fault at extension EA1
Corrective action
Check connections, cable,
coding address "A0" in "Heating
circuit" group and remote
control unit setting.
Check connections, cable,
coding address "A0" in "Heating
circuit" group and remote
control unit setting.
Replace LON communication
module.
Check connections.
Check solar control or Vitosolic.
Check connections.
Check Open Therm extension.
Check setting of coding address
"30"
Check connections Vitocom
100 coding address "95"
Replace LON communication
module.
Remove fault at appliance
concerned.
Remove fault at appliance
concerned.