Viessmann VITODENS 222-F Service Instructions Manual page 72

Troubleshooting
Fault Codes
(continued)
Fault code on display
BE
BF
C1
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.
72
System behavior*1
Control mode without remote
control
Control mode
Control mode
Control mode
Control mode
Control mode, max. pump
speed
Control mode
Control mode
Control mode
Control mode
Vitodens 222-F B2TA 19 and 35 Service
Cause
Communication error,
remote control Vitotrol
heating circuit 3
(with mixing valve)
Incorrect LON
communication module
Communication fault
extension EA1
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. For wireless
remote control units: Check
radio path connections, place
remote control unit and wireless
repeater close to the boiler.
Check KM BUS connection to
wireless base station. Replace
wireless components.
Replace LON communication
module.
Check connections.
Without extension EA1, set
code "5B:0"
Check connections.
Without extension EA1, set
code "32:0"
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.