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E
E20 or E50 - Temperature sensors faulty.
Cold resistance approximately
10k
@ 25° C (DHW and CH sensors)
20k
@ 25° C (Flue sensor)
(resistance reduces with increase in temp.)
E28 - Incorrect PCB fitted
F
1.
Check and correct the connection of the
tube between the venturi and gas valve
2.
Gas at burner
G
1.
Ensure that the Hall Effect Sensor is in position.
Check the connection between the PCB - X400
connector terminals 3,6,7 and the electronic sensor
H
Check and correct if necessary
1. Ignition electrode and lead
2. Electrode connection
3. Spark gap and position
Burner
Sensing
Electrode
© Baxi Heating UK Ltd 2014
NO
NO
Ensure gas is on and purged
PCB - X3 connector is 230V AC across
terminals 1 & 2
NO
Replace PCB
Voltage at PCB - X2 connector is at
least 100V DC across terminals 2 & 5
YES
(Note: from multimeter connect
'common' to 2 & 'volts' to 5).
Check wiring
Electrode Position
18.0 Fault Finding
Replace sensor or PCB (E28)
YES
Replace gas valve
YES
Check the voltage between red wire and blue
wire is more than 5V DC
NO
Replace PCB
NO
YES
Viewing Window
Spark Ignition
Electrode
YES
Replace Hall
Effect Sensor
Replace PCB
Replace igniter
59
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