19 Electrical fusing
No. Message
73 Fault in reference switch, diverter
75 Room temperature sensor assignment
900 Blockage of ash extraction heat exchanger
901 No current flow to ash extraction heat exchan-
ger
902 Blockage of ash extraction burner
903 Electrostatic dust collector warning
904 Thermal contact insertion
905 VFD communication error
906 Primary air damper communication error
907 Secondary air damper communication error
908 Recirculation pump communication error
909 ID fan communication error
910 AC module 1 communication error
911 AC module 2 communication error
912 Supplemental module communication error
913 No extraction current flow 1
914 Extraction 1 blockage
915 Storage room may be empty
916 Relay error AC module 1
917 Filling level sensor error
918 No extraction current flow 2
919 Extraction 2 blockage
920 Relay error AC module 2
921 AGT booster flap communication error
922 Primary air damper blockage
923 Secondary air damper blockage
924 Recirculation flap blockage
925 AGT booster flap blockage
926 Ash extraction heat exchanger end position
927 Combustion chamber sensor interruption
928 Combustion chamber sensor incorrect reading
929 System pressure too high
930 System pressure too low
931 Warning system pressure too low
932 Pressure sensor error
933 Filling level sensor 2 error
934 Direct extraction 1 safety chain
935 Direct extraction 2 safety chain
936 Ignition not possible
19 Electrical fusing
DANGER
-
There is a risk of fatal electric
shocks when working on electrical
components of the system
–
Work may be performed only by a qualified
electrician.
–
Applicable standards and regulations must
be observed.
Position of the fuses on the power element
Fuses on the power element (A1)
Value
Size Use
F1 T 3.15A
5x20
mm
230V AC fuse: Main trans-
former pre fuse
F2 T 125mA
5x20
mm
230V AC fuse: Standby trans-
former pre fuse
F3 T 10A
5x20
mm
230V AC fuse: Relay outputs
F5 F 8A
5x20
mm
Fuse for X18 (power supply
to external modules 230V
AC)
F6 F 8A
5x20
mm
230V AC fuse: Triac outputs
F7 T 2.5A
5x20
mm
12V AC fuse: Heating
lambda sensor
F8 T 2.5A
5x20
mm
18V AC fuse: Internal elec-
tronics for main transformer
F9 T 800mA
5x20
mm
18V AC fuse: internal elec-
tronics, standby transformer;
display supply
F10 T 10A
5x20
mm
Spare fuse
F11 F 8A
5x20
mm
Spare fuse
F12 F 0.5A
5x20
mm
230 VAC fuse: Relay outputs
X26, X27 and X80
F13 F 0.5A
5x20
mm
Spare fuse for F12
For information regarding the accessibility of the
power element, see the boiler installation manual.
Operation manual
maximus L
43