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FAULT FINDING
mini HE --- Installation & Servicing
55
Continued f rom page 54
of fault finding
Continued on page 56 of
fault finding
Ensure the ignition electrode position and spark gaps are correct.
Rectify or replace. Refer to frame 49.
Is the ignition burner
pressure correct? Refer
to frame 35.
no
yes
yes
yes
yes
yes
yes
nono
no no no
yes
yes
no
no no no no
yes
yes
yes
no
Continued on
page 57 of
fault finding
Are LED 1 and LED 3
flashing with LED 2
on, plus lockout L ED
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
thegasvalveinlet?
Is there
230V at
Brown and
Blue at
gas valve
harness
connector
on PCB?
Is f use
continuity
O.K. on
PCB?
Is there a burner
pressure during
ignition period?
Replace faul ty 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 t he
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 r eplace
faulty wiring
Is the continuity o f the
modulator harn ess
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 35.
* see Table 2 at page 4 for the correct v alue
FAULT FINDING