Viessmann VITOTRONIC 100 GC1B Service Manual download pdf (Page 102)

Troubleshooting

102

Diagnosis (continued)

Faults with fault display on the programming unit (continued)

code in

display

Behaviour of system

Cause of fault Action

Controlled operation Therm-Control configuration

error:

plug aJA of

Therm-Control temperature

sensor not inserted

Insert plug aJA

On Vitocrossal:

Check that coding ”0d: 0” is set.

Controlled operation, DHW tank

may be cold

DHW heating

configuration error:

Coding ”55: 3” is set, but

plug aJB is not inserted

and/or

coding ”4C: 1” and ”4E: 1”

not set

Insert plug aJB and check coding

aCc

Controlled operation Return temperature sensor

configuration error:

Coding ”0C: 1” is set, but

plug aJA is not inserted

and/or

coding ”4E: 0” is not set

Insert plug aJA and check coding

aCd

Controlled operation Butterfly valve

configuration error:

Coding ”0C: 2”, ”0C: 3” or

”0C: 4” is set,

and

coding ”4E: 1” is set

If butterfly valve is installed:

Set coding ”4E: 0”

If no butterfly valve is installed:

Set coding ”0C: 0” or ”0C: 1”

Controlled operation Short circuit

Flue gas temperature sensor

Check flue gas temperature sensor

(see page 45)

Controlled operation Communication error

Programming unit

Check connections, if necessary

replace programming unit

Emissions test mode Internal fault Check electronics board

Controlled operation Internal fault Check electronics board

Operation at constant temperature Invalid hardware code Check the control software circuit

board and confirm the coding address:

- Enter coding 2 (see page 101

for instructions).

- Change code 8A to 176.

- Confirm coding 92:160

Boiler controlled on basis of

adjustable high limit

Internal fault

Boiler coding card

Insert boiler coding card or replace

if defective (see page 35)

Controlled operation Open circuit

Flue gas temperature sensor

Check flue gas temperature sensor

(see page 45)

Controlled operation Incorrect LON communication

module

Replace LON communication

module

Boiler cools down External safety equipment Check connection of plug

aBÖ

Check external safety

equipment

5351 338 v1.6

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Viessmann VITOTRONIC 100 GC1B Service Manual Page 102

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