127
Dis-
played
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
E1
X
X
Burner in a fault
state
Ionisation
current too
high during
calibration
Check gap be-
tween ionisation
electrode and
burner gauze as-
sembly (see
page 46).
In open flue opera-
tion, prevent high
incidence of dust in
the combustion
air.
Press reset button
R
.
E2
X
X
Burner in a fault
state
Heating water
flow rate too
low during
calibration.
Flow switch
has shut
down.
Ensure adequate
circulation volume.
Check flow switch.
Remove scaling
and blockages.
Press reset button
R
.
E3
X
X
Burner in a fault
state
Heat transfer
too low during
calibration.
Temperature
limiter has
shut down.
Ensure adequate
heat transfer.
Press reset button
R
.
E4
X
X
Burner blocked Fault, 24 V
supply volt-
age
Replace control
unit.
E5
X
X
Burner blocked Fault, flame
amplifier
Replace control
unit.
E6
X
X
Burner blocked System pres-
sure too low
Top up with water.
Troubleshooting
Fault codes
(cont.)
5585 174 GB
Service