Viessmann Vitoflame 100 Service Instructions For Contractors page 26

Burner control unit
Burner control unit LME 21....
Colour of the LEDs
yellow flashing
constant green light
green flashing
yellow red flashing alternately
constantly red
flashing red
green red alternately
red flickering light
26
(cont.)
1. Press reset button B for approx.
5 s (longer than 3 s).
2. A flashing code will then be dis-
played. The number of flashing sig-
nals in a sequence will indicate the
type of fault. For explanations, see
the table from page 28.
3. To reset the burner and exit the
fault display, press the reset button
approx. 1 s (less than 3 s).
Operating condition
Ignition phase pre purge, ignition acti-
vated
Operation, flame stable
Operation, poor flame stability
Undervoltage (< 165 V)
Fault, burner locked out
Fault code display (for explanations,
see from page 28)
Extraneous light before burner start
Interface Diagnosis
For diagnostic with interface adaptor
(accessories)