Potterton HE Plus Installation & Service Instructions Manual page 51

E
Temperature sensors faulty.
Cold resistance approximately
10kΩ @ 25° C (DHW and CH sensors)
20kΩ @ 25° C (Flue sensor)
(resistance reduces with increase in temp.)
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
© Baxi Heating UK Ltd 2007
Supplied By www.heating spares.co Tel. 0161 620 6677
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
YES
230V AC across terminals 2,5
Check wiring
Burner
7.5 ± 1
Electrode Position
18.0 Fault Finding
Replace sensor
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
4 ± 0.5
10 ± 1
YES
Replace Hall
Effect Sensor
Replace PCB
Replace igniter
51