Viessmann VITOFLAME 200 Service Instructions Manual page 22

Troubleshooting
Diagnosis (burner control unit LMO 14. ...)
Fault/
characteristics
Burner does
not start (no
fault display),
indicator does
not illuminate
Burner does
not start (no
fault display),
indicator
illuminates
Burner does
not start (with (
fault)
Burner starts,
but no flame is
formed f d
22
Flashing Cause
code
red at
LMO 14
No voltage
High limit safety cut−out
activated
10 × Faulty electrical
connection, wires L 1 and
N interchanged or faulty
burner control unit
2 × Motor faulty
2 × Clutch between motor
and oil pump faulty
2 × Oil pump seized or stiff
8 × Oil preheater faulty
2 × Ignition electrodes
poorly adjusted
2 × Ignition electrodes damp
and contaminated
2 × Insulation of ignition
electrodes cracked
2 × Ignition transformer
faulty
2 × Ignition cable faulty
2 × Pump does not supply
oil
(cont.)
Remedy
Check fuse or
connector aBÖ in control
unit, electrical
connections, setting of
heating system ON/OFF
switch on control unit and
mains electrical isolator
Press reset button on
boiler control unit
Check electrical
connection.
If phases are correctly
connected, replace
burner control unit.
Replace motor
Replace clutch
Clean or, if necessary,
replace oil pump
Replace oil preheater
Adjust correctly (see
page 13)
Clean ignition electrode
block
Replace ignition
electrode block
Replace ignition
transformer
Replace ignition cable
Install pressure and
vacuum gauges on
pump and check build−
up of pressure (see
following paragraph)