Potterton Promax HE Store 90 Litres Installation & Servicing Instructions Manual page 46

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
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
46
gas valve
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
YES
is 230V AC across terminals 2,5
Check wiring
Viewing Window
Burner
Electrode Position
NO
Replace sensor
YES
YES
Check the voltage between red wire and
blue wire is more than 5V DC
NO
Replace PCB
5.5
8.5
13
Replace gas valve
YES
Replace Hall
Effect Sensor
NO
Replace PCB
YES
Replace igniter
© Baxi Heating UK Ltd 2006