19
5797 342 - 01
Vitoflex 300-RF Service & Maintenance
Troubleshooting
Fault Message
(continued)
No.
Fault message
Cause
Remedy
001
Fault: High limit safety cut-out
Setting for set supply
temperature is too high
Check the setting for the set supply
temperature
Faulty system component
(boiler circuit pump or return
valve)
Check boiler circuit pump and
temperature maintenance
Power consumption has
suddenly dropped
Check heat draw-off
--
Undo protective cap on high limit
safety cut-out and press reset button
(only possible once boiler water
temperature is <70°C)
002
Fault: Water shortage
Leak in heating system
Consult Viessmann Technical
Service or heating system installer
Leak in safety valve
Consult Viessmann Technical
Service or heating system installer
003
Fault: Water pressure
Pressure relief valve is faulty
(system pressure is too high)
Have a contractor check the pressure
relief valve and replace if necessary
004
Fault: Level, extinguishing water
Too little water in the
extinguishing water tank
Fill water tank
005
Fault: Thermal contact, rotary fan Electrical fault on drive motor
Consult a qualified electrician
Bearing damage
Replace bearing
006
Fault: Thermal contact, infeed
grate
Electrical fault on drive motor
Consult a qualified electrician
Gearbox or bearing damage
Replace gearbox or bearing
007
Fault: Shut-off gate valve sticks
Spring return motor is faulty
Repair or replace spring return motor
Shut-off gate valve does not
reach end position
- Check for trapped foreign bodies
and remove if necessary
- Check and adjust limit switch
008
Fault: Reversal, rotary lock valve
Rotary lock valve is blocked
Check rotary lock valve for trapped
foreign bodies and remove if necessary
009
Fault: Repeat heat-up
Fuel is too damp
Use suitable dry fuel
Oxygen monitoring detects no
combustion
Check oxygen probe, clean, calibrate
and replace if necessary
Combustion chamber fill time
is too short, resulting in lack
of fuel at the ignition system
Adjust combustion chamber fill time
010
Fault: Light barrier, firebed
Sight glasses are dirty
Remove and clean both sight glasses
Ash deposits in apertures
Remove dust and ash deposits from
the apertures
Light barrier is dirty or faulty
Clean or replace the light barrier sensors
Combustion chamber is too full Check combustion parameters and
adjust if necessary
011
Fault: Material shortage
Fuel store is empty
Fill fuel store
Material blockage
Switch OFF mains isolator and remove
material blockage
Shut-off gate valve sticks
Check shut-off gate valve for ease
of operation
