Baxi Solo 2 PF Quick Start Manual download pdf (Page 43)

12.0Fault Finding

43

Replace the gas

valve

Replace PCB

Boiler satisfactory

Set pressure

regulator

Does

the pilot burner

light ?

Does

the main burner

light ?

Does

the boiler shut

down when the water

flow reaches

80-84

o

C ?

Does

pump run

on ?

Is

"Burner On"

light on ?

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

Check there is

20mbar gas pressure

at the inlet to gas valve

Check the pilot injector is

not blocked, partially

blocked or damaged

Check there is

20mbar gas pressure

at the inlet to gas valve

Is

there the

correct burner

pressure at the test

point ?

YES

YES

YES

YES

YES

NO NO

NO

NO

NO

Check pilot injector is

not blocked

Check main injector

is not blocked

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 in the flue terminal.

Failure to comply with the recommended fitting

instructions will adversly affect the operation of

the appliance.

Check pilot flame

size

YES

YES

YES

YES

Check pilot hood

position and pilot

air flow

Check continuity

across mains solenoid

(5 K OHM)

Change gas valve

NO

Change PCB

YES

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 on

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.

Replace PCB

Replace sensor

Check

Potentiometer

(see table)

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