Potterton Performa 28i Installation And Servicing Instructions page 44

Fault Finding Solutions
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 at the gas
valve (see Section 9.2 of Commissioning)
2.
Voltage at modulating coil of gas valve is:
Max. burner press.approx 9V DC (13V DC LPG)
Min. burner press.approx 1V DC
Current at modulating coil of gas valve is:
(Use an instrument with average function for this
measure)
30 ÷ 230 mA DC (45 ÷ 310 mA DC - LPG gas)
H
Check and correct if necessary
1. Ignition electrode and lead
2. Electrode connection
3. Spark gap and position
44
NO
Replace air
pressure switch
Ensure gas is on and purged
PCB - A1 connector has 230V
across terminals 2 & 4
NO
neon flashing
NO
Replace main PCB
230V at Main PCB - A1
YES
connector across terminals
3 & 5. Check wiring
14.0 Fault Finding
YES
Replace gas valve
YES
Turn selector switch
to reset position
YES
Replace gas valve
NO
Replace main PCB
NO
Replace main PCB
YES
Replace igniter