Troubleshooting guide
30
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
6)
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
atmospheric 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
contractor, 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
indicator (see page 5) 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
section 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
display window with flashing fault
code
Fault on heating system Make a note of the fault code
(page 12) and inform your heating
contractor
5581 751 v1.1
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