Potterton Promax HE Store Installation & Servicing Instructions Manual page 54

E
Temperature sensors faulty.
Cold resistance approximately
10k @ 25° C (DHW and CH sensors)
20k @ 25° C (Flue sensor)
(resistance reduces with increase in temp.)
F
Check and correct the connection of
1.
the tube between the venturi and
2.
Gas at burner
G
Check and correct if necessary
1. Ignition electrode and lead
2. Electrode connection
3. Spark gap and position
54
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 is
110V DC across terminals 2 & 5
YES
(Note: from multimeter connect
common to 2 & volts to 5)
Check wiring
Viewing Window
Burner
Electrode Position
NO
Replace sensor
YES
5.5
8.5
13
Replace gas valve
NO
Replace PCB
YES
Replace igniter
© Baxi Heating UK Ltd 2012