Unit installation

42
Fault code System characteris-
tics
Cause Measures
26 Ionisation flame mon-
itor reports external
light ingress during
the start or after the
post-purge
Ignition cables
shorted out
Remove the short circuit.
26 Ionisation flame mon-
itor reports external
light ingress during
the start or after the
post-purge
Ionisation cable or
electrode short cir-
cuit
Remove the short circuit.
26 Ionisation flame mon-
itor reports external
light ingress during
the start or after the
post-purge
Gas train leaks Replace gas train.
26 Ionisation flame mon-
itor reports external
light ingress during
the start or after the
post-purge
Incorrect parame-
ter set selected
Adjust the parameter set
(see page 36 to 37).
27 Flame tears off dur-
ing operation
Incorrect gas type
selected
Adjust gas type (see
page 9).
27 Flame tears off dur-
ing operation
Burner gauze
assembly faulty
Replace the burner gauze
assembly.
27 Flame tears off dur-
ing operation
Incorrect parame-
ter set selected
Adjust the parameter set
(see page 36).
27 Flame tears off dur-
ing operation
Combustion char-
acteristics not
ideal
Adjust burner (see from
page 14).
27 Flame tears off dur-
ing operation
285 kW burner for
open flue opera-
tion
Adjust burner settings
(see page 46).
29 Burner control unit
fault
Internal fault of the
gas pressure
switch input
Replace burner control
unit.
2A Burner control unit
fault
Internal fault of the
air pressure switch
input
Replace burner control
unit.
2b Burner control unit
fault
Internal flame
monitor fault
Replace burner control
unit.
Troubleshooting
Diagnosis
(cont.)
5692 907 GB