Diagnosis; Troubleshooting - Viessmann VITOFLAME 200 Service Instructions Manual

Diagnosis

Fault/system characteristics
Burner does not start (no fault
display), signal lamp does not
illuminate
Burner does not start (no fault
display), signal lamp
illuminates
Burner does not start up (with
fault)
Burner starts up, but no flame
is formed
Pump does not feed oil
Flashing code Cause of fault
red
at LMO 14
No voltage
High limit safety cut−out
activated
10 × flashes Faulty electrical
DDDDDDDDDD
connection, wires "L1"
and "N" interchanged or
faulty burner control unit
2 × flashes Motor faulty
DD
2 × flashes Coupler between motor
DD
and oil pump faulty
2 × flashes Oil pump seized or stiff
DD
8 × flashes Oil pre−heater faulty
DDDDDDDD
2 × flashes Ignition electrodes
DD
incorrectly adjusted
2 × flashes Ignition electrodes damp
DD
and contaminated
2 × flashes Insulation of ignition
DD
electrode cracked
2 × flashes Ignition transformer faulty Replace ignition transformer
DD
2 × flashes Ignition cable faulty
DD
2 × flashes Pump does not feed oil
DD
2 × flashes Shut−off valves closed at
DD
filter or in oil pipe
2 × flashes Filter blocked
DD
2 × flashes Coupler between motor
DD
and pump faulty
2 × flashes Leak in suction line or
DD
filter cup
2 × flashes Oil flow and return hoses
DD
interchanged
2 × flashes Vacuum in suction line too
DD
high (higher than 0.35 bar)
2 × flashes External fuel oil valve
DD
faulty

Troubleshooting

Check
Check fuse or connector aBÖ in control
unit, or check 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 coupler
Clean or, if necessary, replace oil pump
Replace oil pre−heater
Adjust correctly (see page 12)
Clean ignition electrode block
Replace ignition electrode block
Replace ignition cable
Install pressure and vacuum gauges on
pump and check build−up of pressure
(see following paragraph)
Open valves
Clean filter (pre−filter and pump filter)
Replace coupler
Tighten connections
Check oil pipes and connections for leaks
and tighten if necessary
Connect correctly acc. to instructions on
pump
Check cross−section of oil pipes. Replace
filter
Check external fuel oil valve
Check and, if necessary, replace external
oil valve
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