71
Fault code dis-
played
System characteristics
Cause
Measures
Ed
Burner in a fault state
Oil pump motor PCB fault
Check the connecting cable be-
tween control unit and oil pump
motor PCB and replace if necessa-
ry.
Press reset button
R
.
Replace the oil pump motor PCB if
necessary. Replace control unit if
required.
F0
Burner blocked
Communication error,
burner control unit
Replace control unit.
F1
Burner in a fault state
Flue gas temperature lim-
iter has responded.
Check heating system fill level.
Vent the system.
Press reset button
R
after flue sys-
tem has cooled down.
F2
Burner in a fault state
Temperature limiter has
responded.
Check heating system fill level.
Check circulation pump. Vent the
system. Check temperature limiter
and connecting cables.
Press reset button
R
.
F3
Burner in a fault state
Flame signal is already
present at burner start.
Check ignition electrodes, elec-
trode gaps and connecting cables.
Press reset button
R
.
F4
Burner in a fault state
Flame not established at
end of safety time
Check oil supply, ignition electro-
des, electrode gaps and connect-
ing cables.
Check nozzle and solenoid valve
coil.
Correct settings if required; clean
all contaminated parts and replace
faulty components.
Press reset button
R
.
F5
Burner in a fault state
The air pressure switch
does not respond.
Check air pressure switch and re-
place if necessary.
Press reset button
R
.
F6
Burner in a fault state
Fuel valve is not actuated
or no feedback from fuel
valve
Check connecting cable and plug-
in connections of the fuel valve, re-
place fuel valve if necessary.
Press reset button
R
.
F8
Burner in a fault state
Fuel valve closes too late. Check nozzle; vent oil supply line;
check solenoid valve.
Press reset button
R
.
F9
Burner in a fault state
Fan speed too low during
burner start.
Radial fan does not start.
CO limiter or fire safety
switch locked.
Check fan, fan connecting cables
and power supply to fan; check fan
control.
Press reset button
R
.
If a fire safety switch or CO limiter
is installed, check whether one of
these safety mechanisms has re-
sponded.
If CO limiter has responded: check
flue system, boiler and trap for es-
caping flue gas.
Troubleshooting
Fault codes
(cont.)
5686 293 GB
Diagnosis