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© Baxi Heating UK Ltd 2007
16.0 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 flashing
PCB - A1 connector has 230V AC
across terminals 2 & 4
YES
Turn selector switch
to ‘Reset’ position
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 & 4. Check wiring
YES
NO
Replace gas valve
electrical plug &
igniter assembly
YES
H
YES
Check the burner setting pressure of the
gas valve
(see Section 9.2 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.