Operating instructions

113
Dis-
played
fault
code
Const. Weath.-
comp.
System char-
acteristics
Cause Measures
28 X X Regulates with-
out flow tem-
perature sen-
sor (low loss
header)
Lead break,
flow tempera-
ture sensor
Check low loss
header sensor (see
page 130)
If no low loss head-
er sensor is con-
nected, set code
52:0.
30 X X Burner blocked Short circuit,
boiler water
temperature
sensor
Check the boiler
water temperature
sensor (see
page 130)
38 X X Burner blocked Lead break,
boiler water
temperature
sensor
Check the boiler
water temperature
sensor (see
page 130)
40 X Mixer closes Short circuit,
flow tempera-
ture sensor,
heating circuit
2 (with mixer)
Check flow temper-
ature sensor (see
page 138)
44 X Mixer closes Short circuit,
flow tempera-
ture sensor,
heating circuit
3 (with mixer)
Check flow temper-
ature sensor (see
page 138)
48 X Mixer closes Lead break,
flow tempera-
ture sensor,
heating circuit
2 (with mixer)
Check flow temper-
ature sensor (see
page 138)
4C X Mixer closes Lead break,
flow tempera-
ture sensor,
heating circuit
3 (with mixer)
Check flow temper-
ature sensor (see
page 138)
Troubleshooting
Fault codes
(cont.)
5772 909 GB
Service