Baxi Combi 24 HE Installation & Service Instructions Manual page 44

E
Check and correct if necessary
1. Electrical and pressure tube connections
2. Blockage of pressure tubes
3. Restriction in flue
4. Venturi
F
NO
Gas at burner
G
1.
Check the burner setting pressure of
the gas valve
(see Section 9.2 of Commissioning)
2.
Voltage at modulating coil of gas valve is:
Max. burner press.approx 9V DC (13V DC LPG)
Min. burner press.approx 1V DC
Current at modulating coil of gas valve is:
(Use an instrument with average function for this
measure)
30 ÷ 230 mA DC (45 ÷ 310 mA DC LPG)
H
Check and correct if necessary
1. Ignition electrode and lead
2. Electrode connection
3. Spark gap and position
44
NO
Ensure gas is on and purged
PCB - M4 connector is approx 230V AC,
terminals 36 & 38
NO
neon illuminated
NO
Replace PCB
230V at Main PCB - M4
YES
connector across terminals
37 & 38. Check wiring
15.0 FAULT FINDING
Replace air
pressure switch
YES
Replace gas valve
YES
Turn selector switch to
'Reset' position
YES
Replace gas valve
NO
Replace PCB
NO
Replace PCB
YES Replace gas valve
plug/igniter assy
electrical