Potterton Performa 28i, Installation And Servicing Instructions, Page: 41 / 48

41
14.0 Fault Finding
Turn selector to
neon illuminated.
Turn Central Heating
thermostat to maximum.
neon illuminated.
Go to section ‘A’.
neon flashing
Go to section ‘B’.
External controls calling for
heat and where fitted,
internal clock calling for
heat.
Ensure controls are set to
demand and verify the
contacts are closed.
NO
Central Heating - Follow operational sequence
Primary water is diverted
from preheating circuit to
CH system.
neon illuminated.
Primary flow switch
operated.
Pump runs.
Fan runs at max speed.
Air pressure switch proved.
Spark at ignition electrodes
for up to 10 seconds.
neon illuminated
Burner extinguishes after
10 seconds.
Preheating function starts
after 25 seconds.
neon flashing
(see DHW preheating
function).
Primary water is diverted
from preheating circuit to
CH system.
neon illuminated
Go to section ‘M’.
neon flashing
Go to section ‘B’.
neon flashing
Go to section ‘C’.
neons flashing
Go to section ‘D’.
Turn the selector to reset.
If regular resetting is
required or appliance still
does not operate
investigation is necessary.
Go to section ‘J’.
NO
YES
neon flashing
Go to section ‘E’.
neon flashing
Turn selector to the reset
position. If the neon does
not extinguish go to
sections H and K.
Change main PCB.
Go to section ‘F’.
neon flashing
Go to section ‘I’
Preheat control is not at
minimum position. External
control calling for heat.
Go to section ‘L’.
Go to section ‘M’.
YES
NO YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
YES
NO
NO
NO
YES
YES
NO
YES
NO
NO
YES
NO
YES
neon flashing
NO
Go to next page
YES