27
Display
Steps to take
Control unit issues a heat
demand
No
Increase set value and en-
sure heat is drawn off
Yes
Oil preheating starts
No
After approx. 10 min
Check the oil preheater,
lines and plug-in connec-
tions (oil preheater has
not switched through; tem-
perature not reached)
Fault
E6
Yes
Fan starts after max.
3 min.
Green LED on ignition
transformer flashes.
No
Fault
Check fan,
check cables, plug-in con-
nections and power sup-
ply
(fan speed not reached)
F9
Yes
Air pressure switch re-
sponds
No
After approx. 51 s
Check the air pressure
switch, cables and plug-in
connections
Fault
F5
Yes
Ignition and oil pump mo-
tor start
No
Check the ignition module
and oil pump motor, ca-
bles and plug-in connec-
tions
Yes
Solenoid valve opens
No
Fault
Check the oil supply;
check the solenoid valve
F4
Yes
Flame signal present
Symbol
A
No
Fault
Check ignition electrodes,
electrode gaps and con-
necting cables
F4
Yes
Burner in operation.
The green LED on the ig-
nition transformer is per-
manently on (a flame is
recognised).
For further details regarding faults, see page 66.
Commissioning, inspection, maintenance
Function sequence and possible faults
5686 293 GB