Potterton Performa 24 Installation & Servicing Instructions Manual page 41

I
Ensure that mains input
terminal L is Live (230V) and
N is Neutral (0V)
YES
Check and correct if necessary
1. Flame sensing electrode and lead connections
2. Electrode position
Flame current should be 1 µA approx.
J
Overheat thermostat operated
or faulty, i.e. continuity across
thermostat terminals
YES
K
Check terminal 1 of ON/OFF/RESET selector is in
connection with PCB - M1 connector terminal 16
Check electrical continuity across terminals 1 & a
of ON/OFF/RESET selector when turned to
Allow to cool. Continuity
NO
across thermostat terminals
Replace
PCB
R
position
YES
Replace PCB
NO
Replace flame sensing electrode
YES
more than 1.5 ohm
NO
Replace ON/OFF/RESET selector
YES
Replace PCB
14.0 Fault Finding
Replace safety
thermostat
41