Potterton Suprima 30 HE Installation & Service Instructions Manual page 32

Air Pressure Switch Stuck Fault
Refer to the boiler wiring diagram
Switch the boiler on
After 15
seconds,
does the fan run
Yes
Switch off
Unplug the
12 way connector and
both APS leads
Is there continuity
between the
2 orange
wires
Yes
Check the
tubes from venturi
to the APS. Check for
blockages in condensate
system, flue and
heat exch.
Yes
Rectify fault
Fig. 28
32
intelligently applied technology
Unplug
the 12 way
No No
connector from PCB.
Is there continuity
between the
2 orange
wires
Yes
Unplug the
No
APS leads
Is there continuity
across the
the APS
Yes
APS stuck in the
On position. Replace
No
Open circuit on the
APS wiring - rectify
No
APS stuck in Off position
Replace
Lockout
flashing
Replace PCB
Yes
Refit the
12 way
No
connector to PCB.
Unplug one APS lead
Switch boiler
on. Does fan
run ?
Short circuit on the
wiring - rectify
Burner Mains
off off
Open circuit on
the wiring. Rectify
No
Is
there
230 V
at the
fan ?
Yes
Replace fan
© Baxi Heating UK Limited 2005