Potterton Performa 24 Installation & Servicing Instructions Manual page 40

E
Check and correct if necessary
1. Electrical and pressure tube connections
2. Blockage of pressure tubes
3. Restriction in flue
4. Venturi
F
NO
Gas at burner
G
1.
Check the burner setting pressure of
the gas valve
(see Section 9.2 of Commissioning)
2.
Voltage at main PCB - M4 connector is:
approx 70 - 140V DC across terminals 23 & 24
approx 20 - 70V DC across terminals 21 & 22
Min burner pressure approx 14 mA DC across
terminals 21 & 22
Max burner pressure approx 35 mA DC across
terminals 21 & 22
H
Check and correct if necessary
1. Ignition electrode and lead
2. Electrode connection
3. Spark gap and position
40
NO
Ensure gas is on and purged
PCB - M4 connector is approx 70-140V DC,
terminals 23 & 24
NO
neon illuminated
NO
Replace PCB
230V at Main PCB - M4
YES
connector across terminals
25 & 26 and at igniter.
Check wiring
14.0 Fault Finding
Replace air
pressure switch
YES
Replace gas valve
YES
Turn selector switch
to reset position
YES
Replace gas valve
NO
Replace PCB
NO
Replace PCB
YES
Replace igniter
R