Electrolux AOS061E Series Service Manual page 27

Electrolux Professional S.p.A.
Ovens Platform Customer Support
Technical Training & Service
Oven Problem
AOS
Burner does not light
gas
File: AOS service manual (ENG).008
AOS OVENS - Service Manual
Analysis
Burner fan is
working, "burn xxx"
error after the 3
ignition attempts
Burner fan is
working, no ignition
attempts
Burner fan is not
working, "burn xxxx"
error after the 3
ignition attempts
Burner fan is not
working, "burn xxxx"
error appears with no
ignition attempts after
reset
©Copyright 2002 by Electrolux Professional
(595889300 – ENG)
Probable anomaly
Gas tap is closed
Not correct injector
Not correct aerator
Not correct values in
the PWM parameters
Too low setting for
the offset pre ssure
Gas valve is not
opening (the offset
pressure during
ignition is very high -
around 1.00 hPa)
No continuity on the
bridge between
terminals 5-6-7 of the
ignition device
Burner fan not
powered (24 Vdc)
PWM signal at 0
Lack of 230 Vac
signal on X10/11
Checks/causes
Open gas tap
Check injector
Check aerator
Check PWM parameters
Check offset calibration
1) Check the ignition
device is well fixed and
connected to the gas
valve
2) Faulty gas valve
Restore continuity
1) Check that the relevant
switching feeder TR_Fx is
powered through fuse F2
2) Check fuse on TR_Fx
3) Check that 24 Vdc are
present at the output of
TR_Fx (J1-1 e J1-2, J1-3
e J1-4) and at the input on
the fan (with connector X9
disconnected and 24 Vdc
present at the input on the
burner fan, this has to run
at the maximum speed -
see also the following
point 1)
4) Check correct
connections between
TR_Fx and the burner fan
1) Close the gas tap,
disconnect connector X9
and try to start the burner:
the fan has to run at the
maximum speed. If this is
not happening, change
burner fan.
2) If with X9 disconnected
the fan starts, check
connections on X9 and if
they are correct change
main board
1) Ignition device is not
giving the 230 Vac signal
from terminal 8, change
ignition device
2) Check connection from
ignition device to TR_Fx
and to X10/11
P.27/40