27
Troubleshooting
Diagnostics (cont.)
Diagnosis of fault causes
Fault code table (red fault lamp)
Fault Possible cause
2 x flashing The flame is not established at the end of the safety
period
3 x flashing Air pressure switch does not close during pre-purge
4 x flashing Air pressure switch does not open
or external light at burner start (after 65 s)
5 x flashing External light during pre-purge
or internal device fault
7 x flashing Flame tears off during operation
8 ... 17 x flashing Free, no fault code
18 x flashing The air pressure switch opens during pre-purge or
operation
19 x flashing Output contact fault
Wiring fault
External voltage across output terminals
20 x flashing Internal device fault
During the fault cause diagnosis, all control outputs are at zero volt, the
burner remains off. Exception: Error signal at connection S3 (see wiring
diagram from page 38).
5692Ă534ĂGB
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