Operating instructions

Troubleshooting guide
32
Diagnosis and correction Vitotronic 100, GC1
Burner does not switch on Heating program ”9” is set (the
corresponding button is illuminated)
Set ”rw” heating program
(page 10)
Vitoair draught stabilizer defective
(only on boilers with pressure jet
burner)
Inform heating contractor.
Change setting of Vitoair to
manual operation:
Press in rotary knob A on
motor and turn fully beyond
setting ”4”.
A
Failure of motor-controlled flue gas
damper (only on gas boilers with at-
mospheric burner)
Inform heating contractor.
Change setting of motor-controlled
flue gas damper to manual operation:
Press in rotary knob A on motor and
turn fully beyond setting ”4”.
A
Fault on control unit After consulting your heating con-
tractor, the boiler can be operated
temporarily with constant boiler
water temperature by turning the
emissions test switch ”S” to ”h”;
leave cover open.
No fuel Oil or LPG:
Check fuel supply and re-order if
necessary.
Natural gas:
Open gas-shut off valve or contact
gas supply company if necessary.
Burner does not start; red fault indi-
cator flashes on the control unit and
red fault lamp is illuminated on the
burner
Faulty start of burner Make a new attempt to start by
pressing the reset button
On the front of the burner hood
with pressure jet burners,
On the front panel of the boiler
with atmospheric burners.
If the burner still fails to operate
after pressing the reset button,
check the points stated in the sec-
tion headed ”Starting up the heating
system” and then press the reset
button again.
If the burner still fails to switch on,
contact your heating contractor.
Fault symbol ”U” appears in the dis-
play window with flashing fault code
Fault on heating system Make a note of the fault code and
inform your heating contractor
5351 341 v1.2