Operating instructions

Fault
code in
the dis-
play
Const. Weath.-
comp.
System char-
acteristics
Cause Remedy
30 X X Burner
blocked
Boiler water
temperature
sensor
shorted out
Check the boiler
water tempera-
ture sensor (see
page 80)
38 X X Burner
blocked
Boiler water
temperature
sensor lead
broken
Check the boiler
water tempera-
ture sensor (see
page 80)
40 X Mixer closes Mixer circuit
M2 flow tem-
perature
sensor
shorted out
Check flow tem-
perature sensor
48 X Mixer closes Mixer circuit
M2 flow tem-
perature
sensor lead
broken
Check flow tem-
perature sensor
50 X X No DHW heat-
ing
Cylinder pri-
mary tem-
perature
sensor
shorted out
Check sensors
(see page 8 0)
51 X X No DHW heat-
ing
Outlet tem-
perature
sensor
shorted out
Check sensors
(see page 8 0)
58 X X No DHW heat-
ing
Cylinder pri-
mary tem-
perature
sensor lead
broken
Check sensors
(see page 8 0)
59 X X No DHW heat-
ing
Draw off
temperature
sensor short
circuit
Check sensors
(see page 8 0)
Fault codes (cont.)
72
Troubleshooting
5692 619 GB