Viessmann MatriX radiant burner Service Instructions Manual page 30

Pressure jet gas burner (type vm iii) for vitocrossal 300 (type ct3) rated output 170
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Troubleshooting
Diagnostics
(cont.)
Internal system errors
Internal system errors are created if a perfect program sequence can no
longer be guaranteed.
Fault code Error in range
01 and 02,
Burner control unit
04 to 15,
70 to 79,
7A
30
Cause
Internal system error
Remedy
Replace burner
control unit

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