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© Baxi Heating UK Ltd 2009
16.0 Fault Finding
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
37 & 38. Check wiring
YES
NO
Replace gas valve
electrical plug/igniter
assy
YES
H
YES
Check the burner setting pressure of the
gas valve
(see Section 11.2 of Commissioning)
1.
Replace gas valve
NO
Replace PCB
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)
Check and correct if necessary
1. Flame sensing electrode and lead connections
2. Electrode position
Flame current should be 1 μA approx.
Replace PCB
Replace PCB
YES
YES
Replace flame sensing electrode
NO
YES
Ensure that mains input terminal L
is Live (230V) and N is Neutral
(0V)
I
Check terminal 1 of ON/OFF/RESET selector is in connection
with PCB - M1 connector terminal 16
Check electrical continuity across terminals 1 & a of
ON/OFF/RESET selector when turned to ‘Reset’ position
Replace ON/OFF/RESET selector
NO
Replace PCB
YES
K
Replace boiler overheat
thermostat
YES
NO
Boiler overheat thermostat operated
or faulty, i.e. continuity across
thermostat terminals
Allow to cool. Continuity across
thermostat terminals more than
1.5 ohm
J
L
Press the reset button on the flue overheat thermostat. If the
boiler does not relight or repeatedly cuts out check the operation
of the flue system or replace the flue overheat thermostat. If the
flue overheat thermostat has not been activated see section ‘D’
Fault Finding Solutions Sections G to L