Installation Instructions

45
Yes
Burner in opera-
tion
No
Stops below the set
boiler water tem-
perature and
restarts immedi-
ately
Check the flue sys-
tem for tightness
(flue gas recircula-
tion), 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.
Displayed
fault code
System characteris-
tics
Cause Measures
10 Constant mode Short circuit, out-
side temperature
sensor
Check the outside tem-
perature sensor and lead
(see page 49).
18 Constant mode Lead break, out-
side temperature
sensor
Check the outside tem-
perature sensor and lead
(see page 49).
30 Burner blocked Short circuit, boiler
water temperature
sensor
Check the boiler water
temperature sensor (see
page 51).
38 Burner blocked Lead break, boiler
water temperature
sensor
Check the boiler water
temperature sensor (see
page 51).
50 No DHW heating Short circuit, cylin-
der temperature
sensor
Check the sensor (see
page 52).
Troubleshooting
Function sequence and possible faults
(cont.)
5609 059 GB
Service