Viessmann Vitoflame 100 Service Instructions Manual page 17

Diagnostics
(cont.)
Fault
Pump does not feed oil
Burner starts up, but no
oil injected; pressure j ; p
gauge on pump indicates
pressure pressure
Burner starts up and
flame is formed, but ,
burner cuts out after
safety time expires
Cause
Shut-off valves closed at
filter or in oil pipe
Filter blocked
Clutch between motor
and pump faulty
Suction pipe leaking
Oil flow and return
hoses interchanged
Vacuum in suction line
too high (higher than
0.35 bar)
Solenoid valve does not
open
Nozzle blocked
Control unit issues no
voltage to solenoid
valve
Flame monitor faulty
Flame monitor
contaminated
Flame monitor receives
insufficient light
Flame monitor faulty
Control device faulty
Water in tank
Troubleshooting
Remedy
Open valves
Clean filter (pre-filter
and pump filter)
Replace clutch
Tighten connections.
Check oil pipes and
connections for leaks
and tighten.
Connect correctly acc.
to pump markings
Check cross-section of
oil supply pipe.
Clean filter.
Replace solenoid coil
Replace nozzle
Flame monitor check
(external light)
Replace flame monitor
Clean flame monitor
Clean sensor plate and
inside of flame tube
Replace flame monitor
Replace control device
Pump out water
17