Potterton Performa 30 HE Installation & Service Instructions Manual page 45

14.0 FAULT FINDING
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 - A4 connector terminal 2
Check electrical continuity across terminals 1 & a
of ON/OFF/RESET selector when turned to the
RESET position
L
If checks in section I are completed successfully, blockage
of the condensate drain or trap may have occurred
M
If checks in section J are completed successfully, the flue
overheat thermostat may have operated. Press the reset
button on the flue overheat thermostat. If the boiler does
not relight or repeatedly cuts out. Check the operation of
the flue system or replace the flue overheat thermostat
Publication No. 5111815
YES
NO
Allow to cool. Continuity
NO
across thermostat terminals
more than 1.5 ohm
Replace
PCB
Replace PCB
Replace flame sensing electrode
YES
NO
Replace ON/OFF/RESET selector
YES
Replace PCB
Replace safety
thermostat
45