Baxi Combi 105e - Page 41

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14.0 Fault Finding
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 iflashing
PCB - A1 connector has 230V AC
across terminals 2 & 4
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 - A1
connector across terminals
3 & 5. Check wiring
YES
NO
Replace igniter
YES
H
YES
Check the burner setting pressure of
the gas valve
(see Section of Commissioning)
1.
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)
Replace gas valve
NO
Replace PCB
2.