Operating instructions

33
yes
Burner in opera-
tion
no
Stops below the set
boiler water tem-
perature and
restarts immedi-
ately
Check the flue gas
system for tight-
ness (flue gas
recirculation),
check the gas flow
pressure
Fault messages on the display
2f
Faults are indicated by a flashing fault
code with fault symbol "
U
" on the dis-
play.
For fault code explanations see the fol-
lowing table.
Fault code
on the dis-
play
System characteris-
tics
Cause Measures
10 Constant mode Short circuit, out-
side temperature
sensor
Check the outside tem-
perature sensor and lead
(see page 37).
18 Constant mode Break, outside
temperature sen-
sor
Check the outside tem-
perature sensor and lead
(see page 37).
30 Burner blocked Short circuit, boiler
water temperature
sensor
Check the boiler water
temperature sensor (see
page 39).
38 Burner blocked Break, boiler water
temperature sen-
sor
Check the boiler water
temperature sensor (see
page 39).
50 No DHW heating Cylinder tempera-
ture sensor shor-
ted out
Check the sensor (see
page 40).
Troubleshooting
Function sequence and possible faults
(cont.)
5366 836 GB
Service