Viessmann VITOTRONIC 300-K Operations Instructions download pdf (Page 76)

Vitotronic 200 and 300-K Installation and Service

5693 976 - 04

Troubleshooting

Fault Display Vitotronic 300-K (continued)

Fault codes

Displayed fault code System characteristics Cause Measures

B6 Constant mode. Invalid hardware recognized Check coding address

“92” in “General” group;

“92:166” must be selected.

Note: Code “8A:176” must be

selected for coding address

“92” to be displayed.

BA Mixing valve “Closed”. Communication error,

PCB extension for heating

circuits 2 and 3 with mixing

valve

Check insertion of PCB and ribbon

cable; replace PCB if required.

BC Control mode without

remote control.

Communication error,

remote control Vitotrol

heating circuit without

mixing valve A1 (heating

circuit 1)

Check connections for cable

(see separate installation and service

instructions) and coding address “A0”

in the “Heating circuit...” group.

BD Control mode without

remote control.

Communication error,

remote control Vitotrol

heating circuit with mixing

valve M2 (heating circuit 2)

Check connections for cable

(see separate installation and service

instructions) and coding address “A0”

in the “Heating circuit...” group.

BE Control mode without

remote control.

Communication error,

remote control Vitotrol

heating circuit with mixing

valve M3 (heating circuit 3)

Check connections for cable

(see separate installation and service

instructions) and coding address “A0”

in the “Heating circuit...” group.

BF Control mode.

No communication via

LON.

Incorrect LON

communication module

Replace LON communication module.

C2 Control mode. Lead break, KM

BUS to solar control module

or Vitosolic

Check KM BUS cable and device.

Without solar control unit:

Set code “54:0” in the “General”

group.

CF Control mode.

No communication via

LON.

LON communication

module fault

Check LON communication module

and replace if required.

D3 Control mode. Communication error

extension EA1

Check connections

(see page 93).

Without extension EA1:

Set code “5B:0” in the “General”

group.

D5 Boiler ramps up to

electronic maximum

boiler water temperature

limit.

The boiler does not “log in”

at the cascade control unit.

Check communication via participant

check, lines

to Vitotronic 200 and codes

D6 Control mode. Input DE1 at extension

EA1 reports a fault

Remove fault at appliance concerned.

D7 Control mode. Input DE2 at extension

EA1 reports a fault

Remove fault at appliance concerned.

D8 Control mode. Input DE3 at extension EA1

reports a fault

Remove fault at appliance concerned.

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Viessmann VITOTRONIC 300-K Operations Instructions Page 76

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