Baxi Solo 3 PFL 30 Installation & Servicing Instructions Manual page 43

YES
Does
the pilot burner
light ?
NO
Check there is
20mbar gas pressure at
the inlet to gas valve
Check the pilot injector is not
blocked, partially blocked or
damaged
Replace the gas valve
Testing Potentiometer
Three Pin Connector
Set multimeter to the 2 M OHM scale.
Turn potentiometer to the OFF position,
connect the multimeter leads to the
blue/red wire and centre black/yellow
wire of three pin connector.
The reading on the multimeter should
indicate approx 1 M OHM, switch
potentiometer to the ON position, the
reading on the multimeter should be
approx 1 M OHM. Slowly turn
potentiometer knob to the FULL ON
position, the reading on the multimeter
should decrease, proportionally down to
0 OHMs.
Connect multimeter to centre
black/yellow wire and red/yellow wire,
turn potentiometer knob to fully OFF
position, reading on multimeter should
be 0 OHM. Switch potentiometer to
ON position, slowly turn potentiometer
knob to the fully ON position, the
reading on multimeter should increase
proportionally to 1 M OHM, turn
potentiometer off. Reading
multimeter should indicate 0 OHM.
Two Pin Connector
Check potentiometer is in OFF position.
Set multimeter to continuity, connect
multimeter leads to both potentiometer
leads. Turn potentiometer to the on
position, the multimeter's audible alarm
should now be sounding to indicate
continuity.
© Baxi Heating UK Ltd 2009
Does
the main burner
light ?
NO
Is
"Burner On"
light on ?
NO
Are live &
neutral reversed ?
Indicator light inside box
will be lit
Check pilot flame for
correct size
Check & clean electrode.
Check spark gap. Check
electrode lead
Check there is
20mbar gas pressure at
the inlet to gas valve
Replace PCB
on
11.0 Fault Finding
Does
the boiler shut
down when the water
flow reaches
80-84 o C ?
NO
YES
Check there is
20mbar gas pressure at
the inlet to gas valve
Is
there the
correct burner pressure
at the test point ?
YES
Check main injector
is not blocked
YES
Check pilot injector is
not blocked
YES
Check pilot flame
size
YES
Check pilot hood
position and pilot
air flow
YES
Check continuity across
mains solenoid (5 K
OHM)
NO
Change gas valve
Warning
It is important that both the air and flue ducts are cut to
their correct lengths also ensure that the flue duct is
fully engaged.
Failure to comply with the recommended fitting
instructions will adversly affect the operation of the
appliance.
YES
Does
pump run
on ?
YES
Boiler satisfactory
Replace sensor
Check
Potentiometer
(see table)
Replace PCB
NO
Set burner pressure to
16mbar ± 0.5
YES
Change PCB
43