94
Fault code dis-
played
System characteristics
Cause
Measures
20
Regulates without flow tem-
perature sensor (low loss
header)
Short circuit, system flow
temperature sensor
Check low loss header sensor (see
page 103)
28
Regulates without flow tem-
perature sensor (low loss
header)
Lead break, system flow
temperature sensor
Check low loss header sensor (see
page 103)
If no low loss header sensor is
connected, set code 52:0.
30
Burner blocked
Short circuit, boiler water
temperature sensor
Check boiler water temperature
sensor (see page 103)
38
Burner blocked
Lead break, boiler water
temperature sensor
Check boiler water temperature
sensor (see page 103)
40
Mixer closes
Short circuit, flow temper-
ature sensor, heating cir-
cuit 2 (with mixer)
Check flow temperature sensor
44
Mixer closes
Short circuit, flow temper-
ature sensor, heating cir-
cuit 3 (with mixer)
Check flow temperature sensor
48
Mixer closes
Lead break, flow tempera-
ture sensor, heating circuit
2 (with mixer)
Check flow temperature sensor
4C
Mixer closes
Lead break, flow tempera-
ture sensor, heating circuit
3 (with mixer)
Check flow temperature sensor
50
No DHW heating
Short circuit, cylinder tem-
perature sensor
Check cylinder temperature sensor
(see page 103)
51
No DHW heating
Short circuit, outlet tem-
perature sensor
Check the outlet temperature sen-
sor (see page 103)
58
No DHW heating
Lead break, cylinder tem-
perature sensor
Check cylinder temperature sensor
(see page 103)
59
No DHW heating
Lead break, outlet temper-
ature sensor
Check the outlet temperature sen-
sor (see page 103)
92
No solar DHW heating.
Short circuit, collector
temperature sensor; tem-
perature sensor
&
con-
nection on the solar con-
trol module.
Check collector temperature sen-
sor (see page 103)
94
No solar DHW heating.
Short circuit, cylinder tem-
perature sensor; tempera-
ture sensor
%
connection
on the solar control mod-
ule.
Check cylinder temperature sensor
(see page 103)
9A
No solar DHW heating.
Lead break, collector tem-
perature sensor; tempera-
ture sensor
&
connection
on the solar control mod-
ule.
Check collector temperature sen-
sor (see page 103)
9C
No solar DHW heating.
Lead break, cylinder tem-
perature sensor; tempera-
ture sensor
%
connection
on the solar control mod-
ule.
Check cylinder temperature sensor
(see page 103)
Troubleshooting
Fault codes
(cont.)
5773 238 GB
Diagnosis
