FAULT FINDING
Mini
Installation & Servicing
51
Continued from page 50
of fault finding
Continued on page 52 of
fault finding
Ensure the ignition electrode position and spark gaps are correct.
Rectify or replace. Refer to frame 43.
Is the ignition burner
pressure correct? Refer
to frame 29.
no
yes
yes
yes
yes
yes
yes
no
no
no
no
no
yes
yes
no
no
no
no
no
yes
yes
yes
no
Continued on
page 53 of
fault finding
Are LED 1 and LED 3
flashing with LED 2
on, plus lockout LED
on the fascia on?
Repair or
replace
faulty wiring
Press reset button. Is
there 230V across the
Brown and Blue gas
valve connection
during ignition?
Rectify gas supply
fault.
Is there > 17 mbar at
the gas valve inlet?
Is there
230V at
Brown and
Blue at
gas valve
harness
connector
on PCB?
Is fuse
continuity
O.K. on
PCB?
Is there a burner
pressure during
ignition period?
Replace faulty PCB
Replace
fuses
Are the ignition
leads
disconnected
or damaged
and sparking
to earth?
Is a spark
visible at the
burner during
ignition?
Is there ignition at the
burner?
Adjust ignition burner
pressure
Replace
faulty
electrode
assy. Make
connection.
Rectify
faulty
connection
Are the ignition
leads correctly
connected to
PCB?
Replace
faulty PCB
yes
yes
no
no
Is there between 0V dc
and 16V dc at the
connections on the
modulating coil?
(0=min, 16=max)
Repair or replace
faulty wiring
Is the continuity of the
modulator harness
O.K?
Repair faulty gas
valve
Repair faulty PCB
yes
Is the burner pressure
within min and max
value* with the boiler
running?
no
Adjust burner pressure.
Refer to frame 29.
* see Table 2 at page 4 for the correct value
FA
UL
T
F
IND
ING
