Fault Finding - Baxi Combi 130 HE Installation & Servicing Instructions Manual

Before performing fault finding carry out preliminary
electrical checks for earth, continuity and polarity.
See Section 8.13
Display Blank ?
NO
Display Showing 00 ?
NO
Display Showing OF ?
NO
Display Flashing L0
or Loud Ignitions ?
NO
Display Flashing
L2 or L3 ?
NO
Display Flashing
L7 or L8 ?
NO
Display flashing L9 ?
NO
Display Flashing 41 ?
NO
Display Flashing
Ld or LE ?
NO
Display Flashing
LF or Lt ?
Go to No Display
YES
section of the fault
finding instructions.
Check stats at top right
of boiler. Red wires go to
red stat, black wires to
YES
black stat.Check integral
timer wires exit PCB
cover at right hand side
(not run over Main PCB).
Central Heating switched
YES
off. To turn Central Heating
on press Summer/Winter
mode button.
Go to Ignition Lockout
YES
section of the fault
finding instructions.
Go to Thermistor section
YES
of the fault finding
instructions.
Go to Dry-Fire section of
YES
the fault finding
instructions.
YES
Go to Fan section of the
fault finding instructions.
Press the - button. The
display will show 40 and
after 60sec will revert to
YES
normal operation (the
boiler was set for filling
the Central Heating
circuit).
YES Go to Overheat
Lockout section of the
fault finding instructions.
Go to Condensate Trap
YES
or DHW Flow Switch
section of the fault
finding instructions.
NO

15.0 Fault Finding

NOTE: The information shown on the display is
explained on the label on the inside of the outer
case (see Fig. 17).
YES
Display Flashing Lh ?
NO
YES
Display shows 13
continuously ?
NO
Display
YES
repeatedly shows 21 for
10sec & then 26 for
3mins ?
NO
YES
Is the Burner or Heat
Exchanger noisy ?
NO
Central
YES
Heating Run continues
after Room Stat
switches off ?
NO
Burner
YES
lights for 3sec then goes
straight to 25 (Pump
Overrun) ?
NO
CH
YES
works OK, DHW works
but temperature is too
low ?
NO
CH works YES
but DHW does not ?
NO
DHW works
YES
but Central Heating
does not ?
Replace Display PCB.
Check if Live & Neutral to
boiler reversed or Live &
Neutral from boiler
electrical filter to boiler
terminal block reversed.
Otherwise Main PCB
faulty.
Check if Live & Neutral
to boiler reversed.
Otherwise there is a
blockage in the central
heating system.
Go to Burner or Heat
Exchanger Noisy
section of the fault
finding instructions.
Check if Installer
Parameters set for 61
(Intellistat). If Intellistat not
fitted change to 60.
If Intellistat connected
check if Installer
Parameters set for 60
(Room Stat). If so
change to 61.
Check flow restrictor if
fitted. If fitted try smaller
flow restrictor. If still not
OK got to Domestic Hot
Water section of the fault
finding instructions.
Go to Domestic Hot
Water section of the fault
finding instructions.
Go to Central Heating
section of the fault
finding instructions.
47