Baxi Eco 3 Service Manual download pdf (Page 40)

14.0 Fault Finding

40

Check and correct if necessary

1. Electrical and pressure tube connections

2. Blockage of pressure tubes

3. Restriction in flue

4. Venturi

NO

E

Replace air

pressure switch

Gas at burner

Ensure gas is on and purged

Replace PCB

Replace gas valve

neon illuminated

PCB - M4 connector is approx 70-140V DC,

terminals 23 & 24

YES

Turn selector switch

to reset position

R

YES

NO

NO

NO

F

Replace PCB

G

Check and correct if necessary

1. Ignition electrode and lead

2. Electrode connection

3. Spark gap and position

230V at Main PCB - M4

connector across terminals

25 & 26 and at igniter.

Check wiring

YES

NO

Replace igniter

YES

H

YES

Check the burner setting pressure of

the gas valve

(see Section 9.2 of Commissioning)

1.

Voltage at main PCB - M4 connector is:

approx 70 - 140V DC across terminals 23 & 24

approx 20 - 70V DC across terminals 21 & 22

Min burner pressure approx 14 mA DC across

terminals 21 & 22

Max burner pressure approx 35 mA DC across

terminals 21 & 22

Replace gas valve

NO

Replace PCB

2.

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