Potterton Promax 12 SL Installation And Service Instructions Manual page 51

DRY-FIRE
Are
Flow & Return reversed ?
NO
Is the
system full of water ?
YES
Is the
pump running ?
YES
Unplug
5-way PCB
connector. Is there continuity
between H (run pump from
switched live) ?
NO
Disconnect
Flow Switch Inline
connector. With pump running is
there continuity across flow
switch ?
NO
Remove
flow switch from boiler.
Is there a physical blockage to
the paddle within the
flow switch ?
YES
Replace Blockage.
© Baxi Heating UK Ltd 2007
Lights
On Flash Flash
YES
Swop Flow & Return.
NO
Fill system with water and
bleed out all air.
NO
YES
Replace PCB.
YES
Wires from inline
connector to PCB faulty.
NO
Is there a
blockage in the system ?
YES
Replace Blockage.
17.0
ON
E
N
L
Turn
mains off & on. After 5 sec, is
there 240V
at E?
YES
Pump or Pump Wiring
fault.
Viewed from
Wire Entry end
NO
Replace Flow Switch.
Fault Finding
Optional
Pump
Live
YES
NO
mains off, unplug
7-way connector to PCB.
Is there continuity between
NO
Wiring from terminal
block to PCB faulty.
H
7-way Connector
L
Replace PCB.
Turn
F and G ?
G
F
Optional
N
Pump
Live
51