Baxi Combi Instant 80 HE Installation & Servicing Instructions Manual page 47

Fault Finding Solutions
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
(see Technical Data and 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 gas)
H
Check and correct if necessary
1. Ignition electrode and lead
2. Electrode connection
3. Spark gap and position
NO
Ensure gas is on and purged
PCB - A1 connector has 230V across
terminals 2 & 4
NO
neon flashing
NO
Replace main PCB
230V at Main PCB - A1
YES
connector across terminals
3 & 5. Check wiring
14.0
Replace air pressure
switch
YES
Replace gas valve
YES
Turn selector switch
to reset position
YES
Replace gas valve
NO
Replace main PCB
NO
Replace gas valve
YES
electrical plug &
igniter assembly
Fault Finding
R
Replace main PCB
47