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Motor
Does not run Burner motor defective Replace burner motor (see Ch. 7.7)
Capacitor defective Replace capacitor
Air pressure switch Replace air pressure switch
contact continuously closed
Signal lamp orange
lockout after 20 secs. Combustion manager defective Replace combustion manager
motor runs continuously
Air pressure switch defective Replace air pressure switch
Insufficient air
Lockout after Air pressure switch Correct setting of air pressure
motor start contact not made switch, check air supply
Lockout during pre-purge Air pressure switch contact is Correct setting of air pressure
or during operation interrupted due to insufficient switch, check air supply
air pressure
Pressure or negative pressure Replace hose
hose defective
Fan soiled Clean fan wheel and air duct
(see Ch. 7.6 and 7.7)
Air pressure switch defective Replace air pressure switch
Insufficient gas
Burner start is interrupted No gas pressure available, Open fuel shutoff device. If
after solenoid valve is opened. or ball valve closed there is insufficient gas for a
Signal lamp flashes red; prolonged time period, contact
re-start after 10 min. gas supplier.
To interrupt the low gas program:
Press reset-button
Gas pressure switch does not switch Replace gas pressure switch
Burner operation is interrupted, Gas pressure drop i.e Replace filter
signal lamp flashes red due to soiled gas filter
automatic restart after 10 min.
Ignition
No ignition audible Ignition electrode gap too large Adjust ignition electrode (see Ch. 7.5)
Lockout
Ignition electrode or ignition line has Rectify short to earth by
earthed replacing the defective parts
Ignition unit defective Replace ignition unit
No voltage on plug for the ignition Combustion manager defective Replace combustion manager
unit on combustion manager
Flame monitoring
After the boiler control has switched off, Flame formation due to Replace multifunction assembly
signal lamp flashes red/green; leaking solenoid valves
lockout after 20 secs.
Signal lamp flashes green Sensor current too low Check burner setting and
(see Ch. 5.3) sensor electrode / cable
Servomotor
Servomotor does not start Plug connection incorrect Check plug connection
Servomotor defective Replace servomotor (Ch. 7.8)
Servomotor starts then lockout Setting of the limit switch incorrect Correction of limit switch , settings,
closed, ignition load and partial load
limit switches (STO/ZL/ST1)must
not be set above full load (ST2)
Condition Cause Remedy
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