Diagnostics - Viessmann Vitoflame 100 Service Instructions Manual

Troubleshooting

Diagnostics

Fault
Burner does not start
Burner starts, but no
flame builds
16
Cause
No voltage present
High limit safety cut-out
activated
Low water indicator has
switched OFF
Motor faulty
Actuator faulty
Ignition electrodes
poorly adjusted
Ignition electrodes
damp and contaminated
Insulation of ignition
electrodes cracked
Ignition transformer
faulty
Pump does not feed oil
Actuator faulty
Actuator incorrectly
adjusted
Remedy
Check fuse in control
unit and in plug-in
terminal block, check
electrical connections,
position of ON/OFF
switch on control unit
and mains electrical
isolator
Press reset button on
boiler control unit
Check water level and
top up, if necessary.
Press reset button at
boiler control unit.
Replace motor
Replace actuator
Adjust correctly (see
page 14)
Clean ignition electrode
block
Replace ignition
transformer
Replace ignition
electrode block
Install pressure and
vacuum gauges on
pump and check
build-up of pressure
(see following
paragraph)
Replace actuator
Correct setting